Bug 246678

Summary: virtuoso: Usage of CPU is much too high
Product: [Unmaintained] nepomuk Reporter: Martin L ü c h e m <Heinrich20>
Component: generalAssignee: Sebastian Trueg <sebastian>
Status: RESOLVED FIXED    
Severity: normal CC: 83magdalenka, a.harrowell, aheinecke, alejandronova, amrecio, arthur, aspotashev, bero, cfigura77, christopher.tanner, csw, domlyons, edneymatias, heri+kde, kde, loacoon, mail, meyerm, mlinchits, mueller, mutlu_inek, nt1277, rdieter, richb1908, rm, rudd-o, sebas, sonichedgehog_hyperblast00, sven.burmeister, t.bracken, tassilo, thelwyn, tomas.linhart, trueg, wstephenson, ya.maxis11
Priority: HI    
Version: 4.1   
Target Milestone: ---   
Platform: Debian testing   
OS: Linux   
Latest Commit: Version Fixed In: 4.6.1
Sentry Crash Report:
Attachments: Patch 1/2 kdelibs patch by trueg
Patch 2/2 kdebase patch by trueg
Patch 2/2 kdebase patch by trueg
Patch which introduces the new query terms (kdelibs/nepomuk)
Patch that creates the data necessary for the new query terms in nepomukquery
Updated patch which contains missing files (kdebase/runtime/nepomuk)
Updated patch which adds faster pim data conversion (kdebase/runtime/nepomuk)
yet another update for kdebase/runtime/nepomuk
Another update for Will S. - cutting down initial update time again (kdebase/runtime/nepomuk)
Updating patches like crazy: this is probably the best I can do for the initial update. (kdebase/runtime/nepomuk)
Updated patch: yet another improvement.
Updated patch which adds subtype inference (kdebase/runtime/nepomuk)
syslog

Description Martin L ü c h e m 2010-08-04 09:17:52 UTC
Version:           4.1 (using KDE 4.4.5) 
OS:                Linux

Normal working with my notebook. Writing mails with KMail. Then suddenly the application is blocked totally. Nothing happenes. I can see that virtuoso uses more than 50% CPU. Together with KMail using more than 20% and I do not knowhow much memory Kmail is blocked and my system is blocked - annoying!

I did not switch of strigi but switched of indexing of multimedia files. No idea if this will help. Anyway, to work productively with my notebook shall I switch of this whole strigi/nepomuk stuff?

Reproducible: Always

Steps to Reproduce:
no way to reproduce it. 

Actual Results:  
The problem occurs during normal work.


OS: Linux (x86_64) release 2.6.32-5-amd64
Compiler: cc
Comment 1 Rosetzky Cedric 2010-08-30 18:34:05 UTC
Same here, virtuoso-t often uses 50 to 70% of each cores of my CPU for around 2 or 3 minutes.
Comment 2 Sebastian Trueg 2010-08-31 16:05:43 UTC
It would be really interesting to track down in which situations Virtuoso takes this much CPU.
Does this only happen when using KMail or also if KMail is not running?
Comment 3 Rosetzky Cedric 2010-08-31 16:11:15 UTC
I don't use Kmail at all so this can't be it. It seems to happen when "playing" with files. Moving, erasing or copying a certain amount of files seems to trigger this.
Comment 4 Sebastian Trueg 2010-08-31 16:24:01 UTC
Is this still on 4.4.x or 4.5.0?
Comment 5 Rosetzky Cedric 2010-08-31 17:46:15 UTC
4.5.0
Comment 6 Sebastian Trueg 2010-09-02 16:27:45 UTC
can you try a patch for kdebase?
Comment 7 Rosetzky Cedric 2010-09-02 16:37:13 UTC
I'm using a Gentoo overlay ebuild, so I can try to patch it, but I'm not sure I'll manage to do it (it doesn't look complicated though).
By the way, I just switched to 4.5.1, in case it changes something to your patch.
Comment 8 Kolia 2010-09-07 01:16:25 UTC
KDE 4.5.1 here and noticing the same behavior. It was not indexing at the moment. The only particular thing I can think of when it happened is that it started just after I made a svn checkout of kdelibs (thus lots of files written suddenly).

Regards,
Comment 9 Chris Tanner 2010-10-03 21:13:54 UTC
Running a version called 4.5.68 on Mandriva Cooker, and am noticing the same behaviour. CPU usage is not dependent on whether or not kmail is running. Anything that I can look for to help debug this?
Comment 10 Manuel Amador (Rudd-O) 2010-10-12 13:44:38 UTC
The absolute exact same thing happens to me.  It makes KDE completely unusable.  When you strace it, all you can see is a metric ton of futex calls and very little work actually being done.  I really wish I could use KDE but the fact of the matter is, I can't let this destroy my laptop battery life.

Please already confirm this and put some real effort in fixing this problem, OK?
Comment 11 Rosetzky Cedric 2010-10-12 15:30:49 UTC
You still can use KDE, you just have to disable Strigi and Nepomuk. No more CPU problems, and ~150Mo or RAM saved (which is also way too much).
Comment 12 Manuel Amador (Rudd-O) 2010-10-12 15:33:56 UTC
I fail to see the point of using KDE without these KDE technologies.  I admit, there is not that much those technologies are useful for, right now, but saying "Turn off nepomuk and strigi" is sort of like saying "Well, you do without desktop search and semantic information, which is an advertised feature of KDE".  You can drive your car... but forget about turning the radio and A/C on.
Comment 13 Rosetzky Cedric 2010-10-12 17:07:08 UTC
KDE is not only this, and as you said, it's still not quite useful. But you're right, Linux gives this choice, and there are many desktop environments much more stable than KDE.
Comment 14 Alex Harrowell 2010-11-02 12:54:08 UTC
I've got this problem as well, w/KDE4.4.4 and OpenSUSE11.3/2GB RAM/Intel T1700.

Typically, it's associated with KMail, which will happily spend 15 minutes hammering the disk I/O and basically hanging every time it starts up. During that period you either have KMail pulling 25-30% CPU and a *lot* of disk activity, or else Virtuoso running up to 90~% CPU. Interestingly, it is NOT REPEAT NOT hitting the swap - during these events there is typically well over 1GB of RAM available.

This has recently started to be a problem - I don't know whether this is as a result of an update or whether there's some critical folder or mailbox size.

I take the point that you could turn off desktop search, but I don't *have* desktop search and haven't since KDE3.5.7 and good old kerry beagle. I'd like to have a desktop search application rather than KFind. Strigi is disabled through System Settings.

I am at a loss to see the purpose of the whole complex of Akonadi/Strigi/Nepomuk/Virtuoso. It just appears to be a selection of processes that burn enormous quantities of system resources and do nothing whatsoever of any use, except mangling my data now and again.
Comment 15 Bernhard Rosenkraenzer 2010-12-14 20:06:55 UTC
This just happened for me with 4.6.0-beta2:

- Installed 4.6.0-beta2 with a clean ~/.kde
- Opened kmail and imported mails from our IMAP server and contacts and calendars from SOGo
- Quit kmail and did completely unrelated things

Suddenly the system turned sluggish and virtuoso-t consumed 450% CPU (this is a 4-core system with hyperthreading, so the 450% number is ok).
After waiting for about half an hour (assuming it might be related to having imported thousands of messages from an imap server - akonadi is still running even after exiting kmail), virtuoso-t went down to 247%, where it has remained stable for the last couple of hours.

The systemsettings Nepomuk configuration tool says "File indexer is idle", so it's not indexing new files.

As with the other people reporting this, strace shows virtuoso-t doing virtually nothing but futex calls.

There are 164GB spread across 10380 files in my home directory (but again the indexer claims to be idle).

Running processes that may be in some way related:

akonadi_control
akonadiserver
akonadi_agent_server
akonadi_nepomuk_calendar_feeder
akonadi_nepomuk_email_feeder
akonadi_nepomuk_contact_feeder
akonadi_maildispatcher_agent
akonadi_imap_resource
akonadi_davgroupware_resource
akonadi_davgroupware_resource (running twice with different identifiers)
nepomukserver
nepomukservicestub nepomukremovablestorageservice
nepomukservicestub nepomukstorage
nepomukservicestub nepomukstrigiservice
nepomukservicestub nepomukbackupsync
nepomukservicestub nepomukqueryservice
nepomukservicestub nepomukfilewatch
nepomukservicestub nepomukremovablestorageservice


There's no extraordinary spewage in .xsession-errors or the likes.
Comment 16 Bernhard Rosenkraenzer 2010-12-14 20:16:42 UTC
I killed the related processes manually one by one.
virtuoso-t insanity stopped when I killed

nepomukservicestub nepomukstorage

Incidentally, this is the last process I killed, so the others are quite probably not to blame.
Comment 17 Alex Harrowell 2010-12-15 16:17:28 UTC
On Tuesday 14 December 2010 19:06:59 Bernhard Rosenkraenzer wrote:
> https://bugs.kde.org/show_bug.cgi?id=246678
> 

The problem has been resolved for me; I wonder if a recent update changed 
anything?

> 
> Bernhard Rosenkraenzer <bero@arklinux.org> changed:
> 
>            What    |Removed                     |Added
> ---------------------------------------------------------------------------
> - CC|                            |bero@arklinux.org
> 
> 
> 
> 
> --- Comment #15 from Bernhard Rosenkraenzer <bero arklinux org>  2010-12-14
> 20:06:55 --- This just happened for me with 4.6.0-beta2:
> 
> - Installed 4.6.0-beta2 with a clean ~/.kde
> - Opened kmail and imported mails from our IMAP server and contacts and
> calendars from SOGo
> - Quit kmail and did completely unrelated things
> 
> Suddenly the system turned sluggish and virtuoso-t consumed 450% CPU (this
> is a 4-core system with hyperthreading, so the 450% number is ok).
> After waiting for about half an hour (assuming it might be related to
> having imported thousands of messages from an imap server - akonadi is
> still running even after exiting kmail), virtuoso-t went down to 247%,
> where it has remained stable for the last couple of hours.
> 
> The systemsettings Nepomuk configuration tool says "File indexer is idle",
> so it's not indexing new files.
> 
> As with the other people reporting this, strace shows virtuoso-t doing
> virtually nothing but futex calls.
> 
> There are 164GB spread across 10380 files in my home directory (but again
> the indexer claims to be idle).
> 
> Running processes that may be in some way related:
> 
> akonadi_control
> akonadiserver
> akonadi_agent_server
> akonadi_nepomuk_calendar_feeder
> akonadi_nepomuk_email_feeder
> akonadi_nepomuk_contact_feeder
> akonadi_maildispatcher_agent
> akonadi_imap_resource
> akonadi_davgroupware_resource
> akonadi_davgroupware_resource (running twice with different identifiers)
> nepomukserver
> nepomukservicestub nepomukremovablestorageservice
> nepomukservicestub nepomukstorage
> nepomukservicestub nepomukstrigiservice
> nepomukservicestub nepomukbackupsync
> nepomukservicestub nepomukqueryservice
> nepomukservicestub nepomukfilewatch
> nepomukservicestub nepomukremovablestorageservice
> 
> 
> There's no extraordinary spewage in .xsession-errors or the likes.
Comment 18 Aitor 2010-12-26 14:03:39 UTC
The same to me here.
On system preferences it says Strigi is waiting, but virtuoso-t process is taking 159% CPU (2 Cores)

Running KDE 4.6 RC1 on x86_64
Nopomuk Details:
  34369 files in index
  5.3 GB store size

Akonadi precesses:
 3370 ?        00:00:01 akonadi_control
 3372 ?        00:00:53 akonadiserver
 3409 ?        00:00:00 akonadi_agent_l
 3410 ?        00:00:00 akonadi_agent_l
 3411 ?        00:00:00 akonadi_birthda
 3412 ?        00:00:04 akonadi_davgrou
 3413 ?        00:00:00 akonadi_agent_l
 3414 ?        00:00:01 akonadi_imap_re
 3415 ?        00:00:24 akonadi_imap_re
 3416 ?        00:01:27 akonadi_imap_re
 3417 ?        00:00:05 akonadi_imap_re
 3418 ?        00:00:04 akonadi_maildis
 3419 ?        00:00:00 akonadi_microbl
 3420 ?        00:00:00 akonadi_microbl
 3421 ?        00:00:00 akonadi_mixedma
 3422 ?        00:00:00 akonadi_nepomuk
 3423 ?        00:00:00 akonadi_nepomuk
 3424 ?        00:00:06 akonadi_nepomuk
 3425 ?        00:00:00 akonadi_nepomuk
 3426 ?        00:00:03 akonadi_agent_l
 3544 ?        00:00:00 akonadi_agent_s

Nepomuk services:
3422 ?        00:00:00 akonadi_nepomuk
 3423 ?        00:00:00 akonadi_nepomuk
 3424 ?        00:00:06 akonadi_nepomuk
 3425 ?        00:00:00 akonadi_nepomuk
 3466 ?        00:00:00 nepomukserver
 3496 ?        00:00:44 nepomukservices
 3671 ?        00:00:00 nepomukservices
 3672 ?        00:00:08 nepomukservices
 3673 ?        00:00:00 nepomukservices
 3675 ?        00:00:00 nepomukservices
 3676 ?        00:00:33 nepomukservices
Comment 19 Bernhard Rosenkraenzer 2011-01-05 10:12:36 UTC
Happened again here today.
When I got into the office, my work box (which I already updated to 4.6.0-rc2 yesterday) was using up almost all available CPU power in virtuoso-t, and once again, killing the nepomukstorage process fixed it.

So the problem is not fixed, though maybe it's less common than before.
Comment 20 Luca Beltrame 2011-01-05 12:35:22 UTC
If you're using PIM 4.6 (the betas), the problem can be workarounded by disabling the Nepomuk Search runner in krunner.
Comment 21 Martin L ü c h e m 2011-01-05 12:45:04 UTC
Thank you a lot! Can you explain this briefly?

Am Mittwoch, 5. Januar 2011, um 12:35:33 schrieb Luca Beltrame:
> If you're using PIM 4.6 (the betas), the problem can be workarounded by
> disabling the Nepomuk Search runner in krunner.
Comment 22 Luca Beltrame 2011-01-05 14:58:02 UTC
This is not the only cause of the problem, but according to http://lists.kde.org/?t=129170918700001&r=1&w=2 some KRunner queries hang virtuoso-t. Hence, opening up KRunner and disabling the search plugin (wrench -> uncheck "Nepomuk Search") will work around the problem.

It is *not* a fix, it merely prevents the issue from appearing.
Comment 23 Martin L ü c h e m 2011-01-05 15:13:13 UTC
Thank you, Luca but I do not understand a word! krunner is a kde script to 
start applications, correct? How do I inactivate processes, etc. in this way?

Martin

Am Mittwoch, 5. Januar 2011, um 14:58:05 schrieb Luca Beltrame:
> https://bugs.kde.org/show_bug.cgi?id=246678
> 
> 
> 
> 
> 
> --- Comment #22 from Luca Beltrame <einar heavensinferno net>  2011-01-05
> 14:58:02 --- This is not the only cause of the problem, but according to
> http://lists.kde.org/?t=129170918700001&r=1&w=2 some KRunner queries hang
> virtuoso-t. Hence, opening up KRunner and disabling the search plugin
> (wrench -> uncheck "Nepomuk Search") will work around the problem.
> 
> It is *not* a fix, it merely prevents the issue from appearing.
Comment 24 mutlu inek 2011-01-05 15:49:55 UTC
@ Martin: Open Krunner (Alt+F2), then click on the wrench symbol to the very left of Krunner. Then disable the Nepomuk Desktop Search runner plugin and click "apply".
Comment 25 Sebastian Trueg 2011-01-05 16:39:12 UTC
*** Bug 258039 has been marked as a duplicate of this bug. ***
Comment 26 Martin L ü c h e m 2011-01-05 21:24:46 UTC
Am Mittwoch, 5. Januar 2011, um 15:50:06 schrieb mutlu inek:
> @ Martin: Open Krunner (Alt+F2), then click on the wrench symbol to the
> very left of Krunner. Then disable the Nepomuk Desktop Search runner
> plugin and click "apply".

Hey Mutlu, thankx a lot! ;-)
Comment 27 Martin L ü c h e m 2011-01-06 09:12:26 UTC
Starting up my system including KMail without Desktop Search this morning was 
even slower than yesterday! :-(

Result: There are really serious problems with KMail since KDE 4.x and noone 
really has an idea what the reason might be and even more: noone cares! Sorry 
for that!

/"Off-Topic"
To no longer be blamed that I am constantly running a Debian test system I 
changed to kubuntu 10.10. No big difference! Yes Kubuntu normally is faster 
when starting up but the problems within KDE persist!
/End

Am Mittwoch, 5. Januar 2011, um 21:24:49 schrieb Martin L ü c h e m:
> [Bug 246678] virtuoso: Usage of CPU is much too high
Comment 28 Sebastian Trueg 2011-01-06 16:37:15 UTC
*** Bug 228081 has been marked as a duplicate of this bug. ***
Comment 29 Sebastian Trueg 2011-01-06 19:02:01 UTC
*** Bug 228884 has been marked as a duplicate of this bug. ***
Comment 30 Sebastian Trueg 2011-01-06 19:02:36 UTC
*** Bug 230400 has been marked as a duplicate of this bug. ***
Comment 31 Peter Paulsen 2011-01-15 15:11:12 UTC
*** This bug has been confirmed by popular vote. ***
Comment 32 Dirk Mueller 2011-01-19 22:46:19 UTC
Sebastian, whats the status here? this is the only remaining 4.6.0 blocker.
Comment 33 Edney Matias 2011-01-20 01:05:00 UTC
Running KDE 4.6.0 RC 1  with Nepomuk krunner disabled and performance it's ok. Didn't give a try enabling it.
Comment 34 Will Stephenson 2011-01-20 09:46:51 UTC
Created attachment 56212 [details]
Patch 1/2 kdelibs patch by trueg 

This is the patch that Sebastian proposed, which has the drawback that it creates a lot of CPU usage on first run.
Comment 35 Will Stephenson 2011-01-20 09:48:26 UTC
Created attachment 56213 [details]
Patch 2/2 kdebase patch by trueg
Comment 36 Sebastian Trueg 2011-01-20 13:25:11 UTC
The patch Will proposes introduces two optimizations. I could probably reduce the first-run issue if I removed one of the optimizations. I will have to test that though.
Comment 37 Dirk Mueller 2011-01-20 13:37:47 UTC
I would be fine with a mitigation. 

it seems I can change the default of this to false:

[Service-nepomukstrigiservice]
autostart=false

or to disable the krunner plugin. which one actually helps?
Comment 38 Dirk Mueller 2011-01-20 13:40:54 UTC
how do I disable the krunner plugin btw (I mean the default of it being disabled)?
Comment 39 Rex Dieter 2011-01-20 14:39:32 UTC
Will,Sebastian, patch in comment #35 (Patch 2/2 kdebase) seems to be a dup of that from comment #34 (Patch 1/2 kdelibs).

Do either of you want this tested more?  If so, could you repost the kdebase patch?
Comment 40 Martin Tlustos 2011-01-20 16:05:28 UTC
@ Dirk (Comment #38): ALT-F2 and then disable the plugin in the options dialogue
Comment 41 Will Stephenson 2011-01-20 16:16:44 UTC
Created attachment 56242 [details]
Patch 2/2 kdebase patch by trueg
Comment 42 Sebastian Trueg 2011-01-20 17:04:06 UTC
SVN commit 1215973 by trueg:

Backport:
* Fixed the handling of quotes and keywords such as "AND", "OR", and "NOT" in LiteralTerm.
  Now correct bif:contains or regex filters are created for values.
* Made the query parser merge LiteralTerms into a single one to improve query performance.
  While merging two LiteralTerms into one does not yield the exact same query (when merged
  both literal tokens need to appear in the same property value while with separate LiteralTerms
  the tokens can appear in different properties) it should cover close to all typical use cases
  while increasing the performance significantly and getting rid of the nasty "Virtuoso goes
  crazy when I use KRunner" bug.

CCBUG: 246678


 M  +91 -48    literalterm.cpp  
 M  +40 -5     queryparser.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1215973
Comment 43 Sebastian Trueg 2011-01-20 20:11:31 UTC
Created attachment 56252 [details]
Patch which introduces the new query terms (kdelibs/nepomuk)

Could someone please test this and the next patch on kde 4.6 and confirm that it fixes the virtuoso going crazy bug.
Comment 44 Sebastian Trueg 2011-01-20 20:12:36 UTC
Created attachment 56253 [details]
Patch that creates the data necessary for the new query terms in nepomukquery

And this is the second patch to test in combination with the former one on kde 4.6.
Comment 45 Sebastian Trueg 2011-01-20 20:13:43 UTC
Created attachment 56254 [details]
Updated patch which contains missing files (kdebase/runtime/nepomuk)
Comment 46 Sebastian Trueg 2011-01-20 22:44:36 UTC
Created attachment 56258 [details]
Updated patch which adds faster pim data conversion (kdebase/runtime/nepomuk)
Comment 47 Sebastian Trueg 2011-01-20 22:54:10 UTC
Created attachment 56259 [details]
yet another update for kdebase/runtime/nepomuk
Comment 48 Thomas Bracken 2011-01-20 22:54:57 UTC
Hi,

This message is for all who want to get rid
of the nepomuk process which is using up all the 
CPU cycles on the Linux KDE desktop.

I found out where the nepomuk is started up from.

Its in the /usr/share/autostart directory ,
under the file nepomukserver.desktop .

As someone wrote below,

http://forums.opensuse.org/applications/418846-how-do-i-get-rid-nepomuk-virus.html

renaming this file (/usr/share/autostart/nepomukserver.desktop) 
with a non .desktop extension and
clearing out the $HOME/.kde4/share/apps/nepomuk directory
seems to stop this service from running on startup.

Cheers!

Tom Bracken
Comment 49 Martin L ü c h e m 2011-01-21 07:16:17 UTC
Thanks Thomas but shouldn't there be an easier way? I mean KDE 4 was developed 
comletely new and there is no way to prevent this system from running a 
process easier? I would assume a simple switch in kcontrol!!!

Am Donnerstag, 20. Januar 2011, um 22:55:06 schrieb Thomas Bracken:
> https://bugs.kde.org/show_bug.cgi?id=246678
> 
> 
> 
> 
> 
> --- Comment #48 from Thomas Bracken <t bracken shaw ca>  2011-01-20
> 22:54:57 --- Hi,
> 
> This message is for all who want to get rid
> of the nepomuk process which is using up all the
> CPU cycles on the Linux KDE desktop.
> 
> I found out where the nepomuk is started up from.
> 
> Its in the /usr/share/autostart directory ,
> under the file nepomukserver.desktop .
> 
> As someone wrote below,
> 
> http://forums.opensuse.org/applications/418846-how-do-i-get-rid-nepomuk-vir
> us.html
> 
> renaming this file (/usr/share/autostart/nepomukserver.desktop)
> with a non .desktop extension and
> clearing out the $HOME/.kde4/share/apps/nepomuk directory
> seems to stop this service from running on startup.
> 
> Cheers!
> 
> Tom Bracken
Comment 50 Will Stephenson 2011-01-21 09:08:23 UTC
@Martin: Yes, there is.  Look in 'Desktop Search' in systemsettings.  This setting is per-user though.

@Thomas: There is no need to take a crowbar to the autostart .desktop file to prevent Nepomuk starting.  This will prevent any user from locally configuring it to start in the future, and breaks the integrity of the package (rpm -V kdebase4-workspace to see what I mean).  There is an elegant way (which I've just been using to configure Nepomuk and Strigi indexing default settings for openSUSE 11.4).

If you look inside the nepomukserver.desktop autostart there is 

X-KDE-autostart-condition=nepomukserverrc:Basic Settings:Start Nepomuk:true

This means if, per user
$HOME/.kde4/share/config/nepomukserverrc
or system wide
/etc/kde4/share/config/nepomukserverrc

contain 

[Basic Settings]
Start Nepomuk=false

the autostart desktop file evaluates this file and does not start nepomukserver.
Comment 51 Sebastian Trueg 2011-01-21 10:46:02 UTC
Created attachment 56273 [details]
Another update for Will S. - cutting down initial update time again (kdebase/runtime/nepomuk)
Comment 52 Sebastian Trueg 2011-01-21 10:53:44 UTC
Created attachment 56274 [details]
Updating patches like crazy: this is probably the best I can do for the initial update. (kdebase/runtime/nepomuk)
Comment 53 Will Stephenson 2011-01-21 12:19:35 UTC
Re patch in c52: It's still not terminating.  Something else is going on here.  I can make the database available to you privately if you want.  For now I will try with a newly-created non-Akonadi-data database.
Comment 54 Alejandro Nova 2011-01-25 15:08:46 UTC
With pre-release KDE 4.6.0 packages (Rex Dieter repo):

- The first search in KRunner works perfectly.
- The second search in KRunner eats one core.
- The third search in KRunner eats the other core.
Comment 55 Alejandro Nova 2011-01-25 15:17:55 UTC
That was with the Nepomuk file search KRunner Plugin. Now, disabling that, restarting Nepomuk, and enabling Contacts KRunner Plugin...

Works perfectly! I can send mail to contacts instantly, without a wait, without thrashing a core. Kudos!
Comment 56 Sebastian Trueg 2011-01-26 09:05:30 UTC
Created attachment 56434 [details]
Updated patch: yet another improvement.
Comment 57 Will Stephenson 2011-01-26 16:52:01 UTC
@Sebastian [/space/kde/installs/4_6/bin/nepomukservicestub] nepomukstorage(10378)/nepomuk (storage service) CrappyInferencer2::UpdateAllResourcesThread::run: 4 resources updated. Elapsed: 31.703 sec

using my pathological 90000 PIM items database on the core2 1.8GHz machine.

And I can't trigger the busy cpu now with the nepomuk runner, so I'm happy.
Comment 58 Sebastian Trueg 2011-01-27 17:41:32 UTC
Created attachment 56522 [details]
Updated patch which adds subtype inference (kdebase/runtime/nepomuk)

Hey Will, please test this patch. I am not at home and cannot test it with real data but am very curious.
Comment 59 Will Stephenson 2011-01-27 21:05:21 UTC
I don't think the new code in CrappyInferencer2::UpdateAllResourcesThread even runs.  I don't see the Elapsed debug output, neither is there a noticeable CPU spike.
Comment 60 Sebastian Trueg 2011-01-28 11:56:52 UTC
@Will: ok, could you please do me a last favor and provide the output of 

nepoukcmd list "" "" "" "<urn:crappyinference2:inferredtriples>"

(This is after the run with the latest patch)
Comment 61 Will Stephenson 2011-01-28 15:46:15 UTC
Total Results: 0
Comment 62 Will Stephenson 2011-01-29 19:37:23 UTC
I just logged in and the conversion took place on login.  Elapsed time: 41s.  I couldn't make it happen by starting nepomukserver in a running session.
Comment 63 Marc Deop 2011-01-30 13:42:02 UTC
*** Bug 259517 has been marked as a duplicate of this bug. ***
Comment 64 Charlie Figura 2011-01-31 14:15:41 UTC
I'm regularly seeing nepomuk-t consume at least 50% CPU.  I saw the thread above (e.g. comment #24) and checked and found that the nepomuk plugin in krunner was *already* disabled.  So virtuoso-t is *still* burning up my CPU.
Comment 65 Charlie Figura 2011-01-31 14:17:17 UTC
Sorry, I left out that I'm running the released 4.6 version.
Comment 66 Sebastian Kügler 2011-01-31 14:24:08 UTC
@#64: Did you also disable the Contacts runner?
Comment 67 Alvaro Manuel Recio Perez 2011-01-31 14:45:56 UTC
I can confirm the same problem as Charles Figura. I'm using Kubuntu and I don't have a Contacts runner, only Nepomuk.

However, the problem only occurs when using the new Akonadi-enabled PIM suite with Akonadi 1.4.95. Disabling Akonadi and restarting Nepomuk makes virtuoso-t behave as a normal process.
Comment 68 Marc Deop 2011-01-31 15:17:09 UTC
I agree with Álvaro. I have gone back to KDEPIM 4.4.10 and virtuoso is no longer getting crazy.

Maybe the new version triggers something wrong with nepomuk?

Regards
Comment 69 Ralph Moenchmeyer 2011-01-31 17:53:28 UTC
(In reply to comment #68)
> I agree with Álvaro. I have gone back to KDEPIM 4.4.10 and virtuoso is no
> longer getting crazy.
> 

I can confirm that the problem started with the newer Akonadi/Nepomuk versions. 

I, too, have meanwhile given up KDE 4.6 Beta 1/Beta2 and have gone back to KDEPIM 4.4.10. Everything is normal there. 

However, Nepomuk/Akonadi consume permanently 100% of one CPU core in KDE 4.6 Beta 1 and Beta 2.
Comment 70 Alejandro Nova 2011-01-31 21:24:12 UTC
I can confirm the problems with KDE PIM/Akonadi. But my own experience is a little different. 2 different machines, one running Ubuntu, the other one Fedora.

1. I began with almost empty databases, because of the known problems with migration between KDE PIM 4.4.x and KDE PIM/Akonadi. With Fedora, I couldn't trigger the bug, but with Ubuntu I triggered the Virtuoso bug more than once. I narrowed it to the Akonadi-Nepomuk Email Feeder.

2. To workaround the issues I was experiencing with Kubuntu, I tried to remove and recreate the resources with Akonadi Console, and after a try, mail began to flow and Virtuoso core-wasting somewhat stopped. The behavior of Virtuoso this time was different: it was using ~70% of one core, while akonadi_nepomuk_email_feeder was shown as running. Certainly, akonadi_nepomuk_email_feeder can hog a system just like (or more than) Strigi, and this flew under everyone's radar.

3. I simply left akonadi_nepomuk_email_feeder index all the mail. After half an hour, akonadi_nepomuk_email_feeder seemed to finish, because there wasn't more mail to index, and my Virtuoso (hence, NEPOMUK) CPU usage went to the single digits and stayed there.

With Fedora the behavior was more straightforward, but similar. After no recreating resources, but simply using what I had, akonadi_nepomuk_email_feeder pushed my CPU to 70% out of 200%. After a while, all mail was indexed, and NEPOMUK CPU usage went to the single digits.

I filed a separate bug against akonadi_nepomuk_email_feeder (bug 249828) because that process doesn't suspend on batteries like Strigi does. Also, its interaction with Virtuoso and NEPOMUK should be monitored.

This also means that, for everyone affected, a spot-on workaround should be to remove the Nepomuk E-Mail Feeder resource from your Akonadi pool.
Comment 71 Alejandro Nova 2011-01-31 21:34:50 UTC
I forgot one important thing: the size of the mail-folders:

- Folder A: ~1,000 POP3 resource, connected.
- Folder B: ~20,000 IMAP resource, GMail, connected.
Comment 72 Alvaro Manuel Recio Perez 2011-02-01 18:57:24 UTC
After reading about akonadi_email_feeder I was going to write that in my case that wouldn't be the cause of the problem because I have a very small email folder. To prove it, I even removed it from Akonadi and restarted KDE.

Of course, virtuoso-t was again using 100% of a core but to double check I opened Akonadi Console and removed "Nepomuk EMail Feeder". Nothing changed.

But then I noticed "Nepomuk Contact Feeder" and "Nepomuk Calendar Feeder". Indeed, I have some calendars in Akonadi so I tried removing those feeders.

Then, virtuoso-t started behaving. Barely 1% of CPU usage and Nepomuk was indeed working, as I could use Dolphin search and Bangarang.

So, to summarize, there seems to be something in those Nepomuk feeders that is triggering the 100% CPU usage bug. At least, that's what it was causing the problem for me.
Comment 73 Tamás Németh 2011-02-01 19:23:25 UTC
http://nice.nyme.hu/c60cg.pdf

This PDF files makes a nepomukservices process consuming 100% CPU virtually forever if strigi is enabled.
Comment 74 Alvaro Manuel Recio Perez 2011-02-01 19:37:08 UTC
In my machine it seems Strigi/Nepomuk managed to index the PDF without problems.

I downloaded it, searched for words contained in the PDF using Dolphin and it found it without hanging.

I'm using the packages for KDE SC 4.6 from the Kubuntu Backports PPA (I don't know how to get the version of Strigi I'm running).
Comment 75 mbc111 2011-02-01 21:14:39 UTC
Virtuoso no longer displays this cpu-sucking behavior. It'd behaved
very well since kde 4.5

On Tue, Feb 1, 2011 at 1:37 PM, Alvaro Manuel Recio Perez
<amrecio@gmail.com> wrote:
> https://bugs.kde.org/show_bug.cgi?id=246678
>
>
>
>
>
> --- Comment #74 from Alvaro Manuel Recio Perez <amrecio gmail com>  2011-02-01 19:37:08 ---
> In my machine it seems Strigi/Nepomuk managed to index the PDF without
> problems.
>
> I downloaded it, searched for words contained in the PDF using Dolphin and it
> found it without hanging.
>
> I'm using the packages for KDE SC 4.6 from the Kubuntu Backports PPA (I don't
> know how to get the version of Strigi I'm running).
>
> --
> Configure bugmail: https://bugs.kde.org/userprefs.cgi?tab=email
> ------- You are receiving this mail because: -------
> You are on the CC list for the bug.
>
Comment 76 Alejandro Nova 2011-02-02 03:08:12 UTC
Your PDF is "only" 918 pages long.

I have the ultimate hell for the NEPOMUK text indexing engine: a collection of 11 PDFs with ~1,200 pages each of pure text, containing the History of the Chilean Constitution. That's really long, and those PDFs use 41 MB. Believe me: 41 MB of PURE TEXT with NO GRAPHICS and NO FONTS is really too much. Of course, those PDFs clogged the Virtuoso engine here, but only for a minute, and half of that time it wasn't actually Virtuoso what was forcing my CPU, but PDF2Text.

NEPOMUK guys, if you wish, you can download those PDFs directly from http://www.bcn.cl/lc/cpolitica/actas_oficiales-r . It doesn't matter that you don't understand Spanish, those PDFs would be great to torture NEPOMUK and to watch the real impact of small optimizations in the text indexing engine.
Comment 77 Sebastian Kügler 2011-02-02 11:56:04 UTC
@all: This thread is NOT a collection of "everything that makes Nepomuk eat CPU". Please file individual bugreports if you find strigi / Nepomuk choking on a file. That's a completely different issue from this one though, and only makes it harder to get the useful information out of *this* bugreport.

This bugreports is about Nepomuk eating CPU due to a hanging query. Those hanging queries are, for example causes by the contacts or Nepomuk runners. As workaround, these have been disabled in 4.6.0, and we're looking for a structural fix in 4.6.1.

Please, before reacting to this bugreport, makes sure it's this exact issue. If it's not -> file another bugreport (after checking for possible dupes). That makes it much easier to track this bug, and fix it. Thanks.
Comment 78 Alejandro Nova 2011-02-02 13:13:23 UTC
@Sebastian: Sorry about helping somewhat to derail this thread.

I only wanted to report that, in my system, the Nepomuk E-Mail feeder can trigger the same behavior (a hanging query). Alvaro reports that the Nepomuk Contacts feeder can also trigger the same behavior.

There's a pattern here: just like KRunner plugins, those feeders exercise the same parts of NEPOMUK and can produce the same bugs. So, if KRunner plugins are fixed, those runners must be fixed too as part of this bug.
Comment 79 Sebastian Kügler 2011-02-02 13:25:31 UTC
@Alejandro: The runners are only the symptom (and the akonadi feeders other symptoms, apparently).

There's fix available as attachment to this thread (be sure to pick the latest version) which needs some testing. It would be very helpful if you could try this patch and confirm if it fixes your email feeder symptoms as well. (And how long the conversion takes.)
Comment 80 Marc Deop 2011-02-02 13:35:43 UTC
I thought I had reported my experience with the patches but apparently I forgot. Well, I tried both patches and they didn't help a bit with the kdepim 4.6 beta3. In fact, the behaviour becomes much worse  :S. Without the akonadi version of kdepim everything runs just fine though.

Regards
Comment 81 Sebastian Trueg 2011-02-02 14:25:04 UTC
@Marc: just to be clear: you patched both kdelibs and kdebase, reinstalled, and then restarted Nepomuk and the problem still persists?
Comment 82 Marc Deop 2011-02-02 15:01:17 UTC
(In reply to comment #81)
> @Marc: just to be clear: you patched both kdelibs and kdebase, reinstalled, and
> then restarted Nepomuk and the problem still persists?

I did so ( and I can tell you it takes some time in my near 5 years old laptop). Not only restarted but rebooted the machine (ya know, just in case).

I still have the packages I made ready to install again. I can test them again tonight or probably tomorrow morning (both with kdepim 4.4.10 and kdepim 4.6beta3).

Regards
Comment 83 Sebastian Trueg 2011-02-07 09:43:30 UTC
@Marc: could I please get some feedback with the latest patches?
Comment 84 Marc Deop 2011-02-08 01:55:15 UTC
@Sebastian sorry for the delay.

I've tried the patches and everything seems to be fine as long as it's a new user/config.

When I tried with my regular user account virtuoso went crazy for over one and a half hours... untill I killed the processes and started fresh. I guess I should try it more hours to be sure all is ok. I'll report back here soon
Comment 85 Sebastian Trueg 2011-02-08 11:00:06 UTC
@Marc: could you please while virtuoso is going crazy check its status via:

> isql localhost:<PORT> dba dba
> status();

where <PORT> is the port virtuoso was started on. You can get this by checking the config file you see in "ps aux|grep virtuoso"
Comment 86 Marc Deop 2011-02-09 20:14:11 UTC
@Sebastian: I'm sorry to tell you that I started from zero with my own user and haven't found the virtuoso problem yet. (this is with your patches applied)

My apologies :(

Regards
Comment 87 Sebastian Trueg 2011-02-11 11:04:07 UTC
@Marc: isn't this a good thing? Does that mean you cannot reproduce? Or does it still happen if you use your existing data?
Comment 88 Marc Deop 2011-02-11 11:10:24 UTC
@Sebastian: it is for me! I just thought you wanted to debug why happened in the first place while upgrading to a new version. I've run into some trouble with the akonadi kdepim version but the virtuoso-t eating all of my cpu cycles is here no more! :)

Thanks for the work!
Comment 89 Sebastian Trueg 2011-02-11 11:24:36 UTC
Great. So I can apply the patch for KDE 4.6.1. Thanks for all the testing guys.
Comment 90 Sebastian Trueg 2011-02-14 16:19:08 UTC
Patches are commited to git master and KDE/4.6. 4.6.1 will contain the fixes.
Comment 91 Ralph Moenchmeyer 2011-03-14 19:21:28 UTC
Can confirm that everything is OK now with 
Opensuse 11.4, KDE 4.6.1 and a Cyrus imap server.

Good job !
Comment 92 Alejandro Nova 2011-03-14 19:51:49 UTC
Kudos! Sorry about not testing the fix, but I didn't know how to pull a remote branch directly using git until now.

This bugfix is seriously lacking publicity and I tried my best to counter that. Again, thanks!
Comment 93 Edney Matias 2011-03-15 02:44:35 UTC
Is this patch already part of KDE SC 4.6.1?

Thank you for the fix.
Comment 94 Ettore Atalan 2011-06-08 23:08:02 UTC
Created attachment 60798 [details]
syslog

This problem still exists in KDE 4.6.2 (running Kubuntu 11.04).
Comment 95 meyerm 2011-06-22 12:30:47 UTC
Same behaviour on KDE 4.6.4 and KDEPIM 4.6.0. The runners are disabled, strigi not running (disabled in system settings; nepomuk enabled of course). virtuoso-t is using up one of my two cores. Second to virtuoso-t concerning the totally used up cpu time on my computer is now dbus-daemon (not before the update) and third nepomukservicestub.
Comment 96 meyerm 2011-06-22 12:32:26 UTC
Oh, sorry. "nepomukservicestub nepomukstorage" to be precise ;-)
Comment 97 Ralph Moenchmeyer 2011-06-22 23:47:13 UTC
The same problem here. 

Today, after a long time I tested KDEPIM 4.6.0 again with KDE 4.6.4 on an Opensuse 11.4 system. (Basic KDE 4.6.4 components from Opensuse's KDE factory repository and KDEPIM 4.6.0 from an KDE-"Unstable" repository of Opensuse.) 

Kmail was connected to a cyrus imap server with tons of mails. All the imap folders were nevertheless built up and filled in Kmail/Akonadi surprisingly  rapidly. However, when starting KDE itself again nepomuk and virtuoso-t ran amok.  

I have an Intel i7 950 quadcore with hyperthreading (8 threads). The cpu consumption of vituoso-t and nepomuk appear to be  distributed over all cpu threads. However, in sum and on average the load of virtuoso-t consumes at least one cpu thread completely. According to ksysguard the following processes determine the cpu load (8x100%) :      

virtuoso-t : 96% - 126 % (i.e. on average more than one cpu thread of 8 is used completely) 

nepomukservices : 8% - 12 % (kind of a leading nepomukservices process)

dbus-daemon : 2% - 8%

several other nepomukservices processes: each with 2% - 4% 

akonadi-nepomuk: 2% - 4% 
 
This pattern was active over 20 minutes with no end in sight. The same after a new start of the system. I gave up then and went back to KDEPIM 4.4.11 (with Kmail 1.13.7). 

So my impression is that the problem is not fixed or resolved. 

Regarding my comment #91: 
After looking into some logs I now think I reported wrongly. My positive impression at that time probably came from an Opensuse system that mixed KDE 4.6 with KDEPIM 4.4. Sorry for any confusion comment #91 may have caused. 

Off topic: KDEPIM 4.6.0 apparently does not offer any chance to connect to Open-Xchange calendars or OX address books. So OX users can't use it productively, anyway.
Comment 98 Andre Heinecke 2011-06-27 09:16:09 UTC
Hi,
I have gotten reports from multiple users of KDEPIM on Windows that they see the same behavior (CPU Spiking of Nepomuk for a short time and blocking the system)
The Version they use is latest 4.6 branches.
We are probably talking about another bug here then the one fixed for kde 4.6 but there are still issues with the cpu consumption at least when kdepim is used.

Is there any advice on how to get better debug information on this? Like turn on some Virtuoso logging to see what is going on?

With the reports from #97 #95 and #94 I've reopened this bug, I hope that was ok or should i also have then removed the kde-4.6.0-blocker keyword. I just want to avoid that this bug gets lost as resolved.

Regards
Comment 99 Andre Heinecke 2011-06-27 16:07:28 UTC
I was able to reproduce a bug that specific to the complaints i've gotten and opened bug 276620 for this which is more specific (Marking Mails with KMail causes virtuoso to spike in cpu usage):
 https://bugs.kde.org/show_bug.cgi?id=276620

Apologies for reopening this bug i am marking it as resolved again because the issue mentioned for most of this report is appearantly fixed and i am seeing a different virtuoso cpu spike.
Comment 100 S. Burmeister 2011-07-05 13:11:18 UTC
Unfortunately the bug does seem to exist in KDE 4.6.4. It was said that one can test whether it really got stuck by disabling nepomuk. If virtuoso-t stops some time after that as well, everything is "ok" since it was just working on something and not just stuck. But now it seems that virtuoso-t is stuck in some loop, i.e. it uses one full core even 10 minutes after nepomuk was disabled and strace does not show any activity as well.

ps aux | grep virtuos
user   2454  1.6  4.1 250936 84940 ?        SNl  Jun29 135:54 /usr/bin/virtuoso-t +foreground +configfile /tmp/virtuoso_nn2440.ini +wait


strace -p 2454 -tt -s 1000
Process 2454 attached - interrupt to quit
15:04:42.952129 futex(0x108a424, FUTEX_WAIT_PRIVATE, 2439, NULL

and no change after minutes.

Attaching gdb to the process is somehow not possible, i.e. it reports:

Attaching to process 2454
/usr/bin/virtuoso-t (deleted): file or directory not found.

I can see the process in the list though and that file exists.
Comment 101 Edney Matias 2011-08-09 13:45:27 UTC
Hi there.

I can confirm the strange behavior but also can confirm that disabling nepomuk, virtuoso-t stops some time later. Is it possible to find out where he is stuck, what he is doing?

Anyway I will let it do its thing.

Thanks.
Comment 102 Ralph Moenchmeyer 2011-08-09 17:22:25 UTC
Follow up of comment #97: 

Meanwhile, I have upgraded from KDE 4.6 to KDE 4.7. And for KDE 4.7 I cannot reproduce the strange CPU consuming behavior of Akonadi/Nepomuk/virtuoso-t anymore. 

I use Kmail 4.7. I connected it via an Akonadi resource to an IMAP server with tons of mails. After the initial Akonadi update with all IMAP mail information from some hundred mailfolders there was indeed some background activity of Nepomuk/virtuoso-t. 

But: It occured mainly during periods of low system activity and it did not last forever. It stopped after some time - maybe 10 minutes. No comparison to KDE 4.6.x. So, with KDE 4.7 I see a much better and maybe more intelligent performance regarding Nepomuk/virtuoso-t.

Now, when starting KDE I sometimes see some minor Nepomuk activity for a short period of time (< 30 seconds). But this is not really worth mentioning.   

This is something I can live with. Good job.       

Off topic: Kontact 4.7 still does not work with Open-Xchange 5 servers. Only with Open-Xchange 6 servers. But for OX 6 it really works very well.
Comment 103 richb1908 2012-01-14 16:59:58 UTC
Same happening with KDE 4.8 RC2 in Kubuntu 11.10. Virtuoso-t consumes 50% cpu during any type of computer use. It happens every time Nepomuk is enabled. 
Disabling Nepomuk while this is happening keeps virtuoso-t a running process indefinitely. If I kill it, it just restarts. Logging out and back in the session after disabling Nepomuk corrects the problem.
Comment 104 Alejandro Nova 2012-01-14 17:20:51 UTC
@richb1908@gmail.com: Some things you can do.

There are 2 things that will make your Virtuoso install to use 100% CPU in KDE 4.8. Both are normal.

- Virtuoso is indexing files.
- Virtuoso is indexing mail.

1. To counter the heat, run the following command as root:

echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load

That will stop your processor speed to scale up, if it gets used by Virtuoso.

2. See what Virtuoso is doing.

- If you have a "&" like icon in your system tray, Virtuoso is indexing files.
- If you don't have that, run akonadiconsole and look for a resource named "Akonadi Nepomuk Feeder". If it's indexing mail, leave it alone. It will stop working when you are using the computer and it will resume indexing when you leave.

The third cause (Virtuoso eating CPU like crazy) shouldn't exist in KDE 4.8. Check if you have Akonadi 1.6.90 or higher.
Comment 105 richb1908 2012-01-14 17:41:14 UTC
The third case may be the problem. I have akonadi-server 1.6.2-0ubuntu1. It
is the only version available through the beta ppa for KDE 4.8
Richard


On Sat, Jan 14, 2012 at 12:20 PM, Alejandro Nova <alejandronova@gmail.com>wrote:

> https://bugs.kde.org/show_bug.cgi?id=246678
>
>
>
>
>
> --- Comment #104 from Alejandro Nova <alejandronova gmail com>  2012-01-14
> 17:20:51 ---
> @richb1908@gmail.com: Some things you can do.
>
> There are 2 things that will make your Virtuoso install to use 100% CPU in
> KDE
> 4.8. Both are normal.
>
> - Virtuoso is indexing files.
> - Virtuoso is indexing mail.
>
> 1. To counter the heat, run the following command as root:
>
> echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
>
> That will stop your processor speed to scale up, if it gets used by
> Virtuoso.
>
> 2. See what Virtuoso is doing.
>
> - If you have a "&" like icon in your system tray, Virtuoso is indexing
> files.
> - If you don't have that, run akonadiconsole and look for a resource named
> "Akonadi Nepomuk Feeder". If it's indexing mail, leave it alone. It will
> stop
> working when you are using the computer and it will resume indexing when
> you
> leave.
>
> The third cause (Virtuoso eating CPU like crazy) shouldn't exist in KDE
> 4.8.
> Check if you have Akonadi 1.6.90 or higher.
>
> --
> Configure bugmail: https://bugs.kde.org/userprefs.cgi?tab=email
> ------- You are receiving this mail because: -------
> You are on the CC list for the bug.
>
Comment 106 Alejandro Nova 2012-01-15 19:27:09 UTC
Please, file a bug against Kubuntu. Historically, there have been problems with 3 packages essential to Nepomuk/Akonadi: strigi; soprano and akonadi. Strangely, they are not covered by Kubuntu official PPAs, and if those packages are not updated to their latest releases, you WILL face problems. Currently:

- Strigi is at 0.7.7.
- Akonadi is at 1.6.90 (for KDE SC 4.8)
- Soprano is at 2.7.4 (2.7.5 is imminent).
Comment 107 richb1908 2012-01-15 19:31:42 UTC
Thanks Your suggestion:

echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load


Has kept the cpu  and temps down.

I will file the bug report.
Richard


On Sun, Jan 15, 2012 at 2:27 PM, Alejandro Nova <alejandronova@gmail.com>wrote:

> https://bugs.kde.org/show_bug.cgi?id=246678
>
>
>
>
>
> --- Comment #106 from Alejandro Nova <alejandronova gmail com>  2012-01-15
> 19:27:09 ---
> Please, file a bug against Kubuntu. Historically, there have been problems
> with
> 3 packages essential to Nepomuk/Akonadi: strigi; soprano and akonadi.
> Strangely, they are not covered by Kubuntu official PPAs, and if those
> packages
> are not updated to their latest releases, you WILL face problems.
> Currently:
>
> - Strigi is at 0.7.7.
> - Akonadi is at 1.6.90 (for KDE SC 4.8)
> - Soprano is at 2.7.4 (2.7.5 is imminent).
>
> --
> Configure bugmail: https://bugs.kde.org/userprefs.cgi?tab=email
> ------- You are receiving this mail because: -------
> You are on the CC list for the bug.
>
Comment 108 Alejandro Nova 2012-01-15 19:58:26 UTC
Already filed it:

https://bugs.launchpad.net/kubuntu-packaging/+bug/916903

Please, vote for that report!
Comment 109 Edney Matias 2012-01-16 12:23:34 UTC
Hi there!

Right now running Fedora 16 with KDE 4.8 RC 2 from Red Hat KDE Repository. These are my packages version

strigi-libs-0.7.7-1.fc16.x86_64
kdegraphics-strigi-analyzer-4.7.97-1.fc16.x86_64
akonadi-1.6.90-1.fc16.x86_64
kdepimlibs-akonadi-4.7.97-1.fc16.x86_64
soprano-2.7.4-1.fc16.x86_64

There's no '&' on my tray, it's hidden and stating that the file indexer is idle. Akonadi Nepomuk Feeder states "system busy, indexing suspended". Virtuoso is at 99.3% of my 4 core CPU, since i activated it again. My machine was shut off once since then because of overheating.
Comment 110 Edney Matias 2012-01-16 16:29:10 UTC
...since my last comment, virtuoso is at 99.4% of my CPU.
Comment 111 Martin L ü c h e m 2012-01-16 17:57:13 UTC
Hi all,

Directly translated from German we would say: "I am loosing all my hopes for KDE"

Ok, sorry, not very quailfied! But anyway I wonder what really happens in this area. I am working with a 4 years old dual-core Notebook and this problem really hurts. But Edney's machine is much faster and the system brings the machine down anyway. Is this system design or the rollout strategy for virtuoso, nepomuk, akonadi and all the rest of this nicely designed system framework?

Regards, Martin
-------- Original-Nachricht --------
> Datum: Mon, 16 Jan 2012 16:29:12 +0000
> Von: Edney Matias <edneymatias@gmail.com>
> An: Heinrich20@gmx.de
> Betreff: [Bug 246678] virtuoso: Usage of CPU is much too high

> https://bugs.kde.org/show_bug.cgi?id=246678
> 
> 
> 
> 
> 
> --- Comment #110 from Edney Matias <edneymatias gmail com>  2012-01-16
> 16:29:10 ---
> ...since my last comment, virtuoso is at 99.4% of my CPU.
> 
> -- 
> Configure bugmail: https://bugs.kde.org/userprefs.cgi?tab=email
> ------- You are receiving this mail because: -------
> You reported the bug.
Comment 112 S. Burmeister 2012-01-16 18:32:13 UTC
If you want to "use" nepomuk you have to remove its database from time to time. You will lose your tags etc. and you might have high CPU usage because it re-indexes all files – but at least that cpu usage ends at some point. And to be honest, nepomuk is of no use as desktop search anyway, compared to state-of-the-art desktop searches.

Sadly it happens very often that at some point or after an upgrade from KDE 4.x to 4.y virtuoso uses the cpu constantly, never comes to an end.

There are some hints at http://kdeatopensuse.wordpress.com/2011/11/09/debugging-nepomukvirtuosos-cpu-usage/ on how to debug.

But as I mentioned, the quickest way of getting around that buggy piece of software is to just remove its database from time to time. Does not sound nice and I wish it was different, but these issues have been around for years and are still not resolved.
Comment 113 S. Burmeister 2012-01-16 18:37:14 UTC
Forgot the most important part:

As user issue rm -rf ~/.kde4/share/apps/nepomuk or use dolphin to remove that folder and get rid of all nepomuk data.

If you want to play nice you can disable nepomuk before doing so and re-enable it afterwards.

For some distros it might be ~/.kde/…

And BTW, please do not confuse nepomuk with akonadi which did not have years yet to stabilise and did in fact get quite stable within a short time and works very well in 4.8 – unlike nepomuk.
Comment 114 Alejandro Nova 2012-01-16 19:04:35 UTC
@S.Burmeister: from my experience, there have been multiple super-bugs with Nepomuk, and now all of them lie in the Akonadi Nepomuk Feeder. Make the test; open akonadiconsole, disable the Akonadi Nepomuk Feeder and in all cases your CPU use will decrease to zero in a matter of minutes (if you have some files left to index, your HDD will get used, but Nepomuk will scale up and down quickly).

If there is a way to permanently disable the Akonadi Nepomuk Feeder, that would bring an end to all of this.
Comment 115 S. Burmeister 2012-01-16 19:10:24 UTC
Nope, sorry. The feeder did/does have its bugs but its not the sole/main cause of all nepomuk issues and virtuoso cpu hogging.
Comment 116 Martin L ü c h e m 2012-01-16 22:36:12 UTC
Hi Folks,

the Akonadi framework is the main reason for me to quit KMail. Sinse 
1999 I have been using KMail, most of the time I thought, this was one 
of the best mail clients to get. Easy to use and working!

But with KDE 4 and "I don't now what" corresponding version of PIM/KMail 
(4.?) the situation ended up getting catastrophically. Know I will move 
to thunderbird and one step further after more than ten years of using 
Linux/KDE might be to move to Windows 7. Not a fault of M$! I might 
leave a platform that I thought it really was an alternative one.

Regards, Martin

PS: Last bug I found was in kdewallet, ending up to become very slow. I 
wonder which application on my system really works.

m 16.01.2012 20:10, schrieb S. Burmeister:
> https://bugs.kde.org/show_bug.cgi?id=246678
>
>
>
>
>
> --- Comment #115 from S. Burmeister<sven burmeister gmx net>   2012-01-16 19:10:24 ---
> Nope, sorry. The feeder did/does have its bugs but its not the sole/main cause
> of all nepomuk issues and virtuoso cpu hogging.
>
Comment 117 S. Burmeister 2012-01-16 22:47:15 UTC
Please do not spam this bug with unrelated issues but only info that helps to fix or work around this bug!

Please do only quote text you refer to.

Akonadi/kwallet/whatsoever bugs belong into another bug report and everything OT belongs on some personal blog, forum or mailinglist but not the bug tracker.
Comment 118 Martin L ü c h e m 2012-01-16 23:19:16 UTC
Hi Sven,

would you kindly have a look at the history of this issue? I know what I 
did! I myself started this bug report! How long ago? Was this problem 
really solved? Maybe, maybe not! Noone looks at this situation from a 
global perspective that tells us that KDE really runs out of acceptance 
because if one bug is fixed two others are opened.

Maybe this is Spam and there is noone to be blamed because nowadays 
there are really not enough developers to solve all the problems that 
are the result of a ambitious project. A pity!

Martin

Am 16.01.2012 23:47, schrieb S. Burmeister:
> https://bugs.kde.org/show_bug.cgi?id=246678
>
>
>
>
>
> --- Comment #117 from S. Burmeister<sven burmeister gmx net>   2012-01-16 22:47:15 ---
> Please do not spam this bug with unrelated issues but only info that helps to
> fix or work around this bug!
>
> Please do only quote text you refer to.
>
> Akonadi/kwallet/whatsoever bugs belong into another bug report and everything
> OT belongs on some personal blog, forum or mailinglist but not the bug tracker.
>
Comment 119 richb1908 2012-01-16 23:30:43 UTC
Martin,
Yous is an editorial comment and does not further the solution of this problem. And I just editorialized again.

To get back on track, The suggestions made in an earlier post

echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load

Has "corrected' the problem for me in KDE 4.8 RC2. Corrected in quotes as it has prevented high cpu and overheating. Also the latest strigi, akonadi and soprano packages were not included in the upgrade to KDE that my distro provided and may just be a packaging issue. So it is still an open issue.

Let's give information to the developers that resolves the problem please.
Comment 120 Edney Matias 2012-01-16 23:33:36 UTC
Hi there.

Writing to let you know that after many hours virtuoso now sit quite on my process list. This already happened before and an update to the system put it crazy again.

Thank you.
Comment 121 Alejandro Nova 2012-01-17 00:35:08 UTC
Basically this issue connects several bugs. Some of the most memorable ones are:

- Virtuoso being locked up with strigi, one core sleeping - killed with KDE 4.6.1.
- Various memory leaks, some with Virtuoso, some with nepomukstorage, and even some with dbus-daemon. The last one of those was fixed with Soprano 2.7.3.
- Virtuoso being locked up with akonadi-nepomuk-email-feeder, one core wasted. That one haunted KDE 4.7.x until ~4.7.4.
- Virtuoso being locked up with akonadi-nepomuk-feeder, one core wasted. That is the latest incarnation of this bug, and is what richb1908@gmail.com was experiencing.

All of these real issues were amplified by more downstream issues.

- Strigi lacks a real release policy. During most of 2010 and part of 2011, Debian shipped Strigi 0.7.2, an extremely buggy and ancient release.
- Akonadi and Soprano are not updated with KDE, in KDE dependent distros.

So, you can't really fix this, unless:

- You require a Virtuoso + Soprano + Akonadi + Strigi + Shared Desktop Ontologies stack, and maintain it with a KDE 4.x release cycle.
- You assign a real maintainer to akonadi-nepomuk-feeder (that package is somewhat orphan, unlike Nepomuk).
- You REQUIRE distros shipping KDE to UPDATE their packages. That can be made easily through CMakeFiles (if you ship KDE 4.8, then you must have certain versions of Soprano, Akonadi, Strigi and shared-desktop-ontologies)
- You MAKE a "Update my Ontologies" app like what Bangarang has. That's a necessity.

Once you have all of this sorted out, you can really begin with bug triaging and reporting. Reporting bugs without all of these requirements unmet will be a waste of time for the reporter and for the developer.

About the Nepomuk database erasing: if I read correctly Sebastian Trueg's blogs and dev history, KDE SC 4.8 is going to be the last release that will require erasing everything to work well. The Akonadi Nepomuk Feeder is fresh code, made with something called DMS (AFAIK, replacing hand tuned SQL queries with queries generated automatically)

Please, be more constructive about how to fix this. I really hate Nepomuk bugs, I really want the thing to work, but we won't get anywhere if we just kill the thing. Remember that Nepomuk is the very thing (WinFS) that Microsoft FAILED to implement, and Sebastian Trueg has made tremendous strides to do what  Microsoft failed to do, with no resources, and (as of late) with no money.
Comment 122 Martin L ü c h e m 2012-01-17 08:55:12 UTC
Hi Alejandro,

thanks a lot for the information! Some of it I do understand, some I don't. I myself have the project lead in a commercial development project where not all the time I do understand the dependencies. The whole KDE 4.x - project, is there anyone who understands the dependencies and the release plan (if there is one)?

Talking about this issue: What shall we do, reopen it or keep it running in parallel?

Only someone who really understands how the different parts work together could track an issue like that. I myself do not have time and (no longer) patience to do so. 

I am a KDE/Linux user who tried to help but stopped writing bug reports because there are too many. I have no idea where to start and where this might end!

Regards, Martin
-------- Original-Nachricht --------
> Datum: Tue, 17 Jan 2012 00:35:10 +0000
> Von: Alejandro Nova <alejandronova@gmail.com>
> An: Heinrich20@gmx.de
> Betreff: [Bug 246678] virtuoso: Usage of CPU is much too high

> https://bugs.kde.org/show_bug.cgi?id=246678
> 
> 
> 
> 
> 
> --- Comment #121 from Alejandro Nova <alejandronova gmail com>  2012-01-17
> 00:35:08 ---
> Basically this issue connects several bugs. Some of the most memorable
> ones
> are:
> 
> - Virtuoso being locked up with strigi, one core sleeping - killed with
> KDE
> 4.6.1.
> - Various memory leaks, some with Virtuoso, some with nepomukstorage, and
> even
> some with dbus-daemon. The last one of those was fixed with Soprano 2.7.3.
> - Virtuoso being locked up with akonadi-nepomuk-email-feeder, one core
> wasted.
> That one haunted KDE 4.7.x until ~4.7.4.
> - Virtuoso being locked up with akonadi-nepomuk-feeder, one core wasted.
> That
> is the latest incarnation of this bug, and is what richb1908@gmail.com was
> experiencing.
> 
> All of these real issues were amplified by more downstream issues.
> 
> - Strigi lacks a real release policy. During most of 2010 and part of
> 2011,
> Debian shipped Strigi 0.7.2, an extremely buggy and ancient release.
> - Akonadi and Soprano are not updated with KDE, in KDE dependent distros.
> 
> So, you can't really fix this, unless:
> 
> - You require a Virtuoso + Soprano + Akonadi + Strigi + Shared Desktop
> Ontologies stack, and maintain it with a KDE 4.x release cycle.
> - You assign a real maintainer to akonadi-nepomuk-feeder (that package is
> somewhat orphan, unlike Nepomuk).
> - You REQUIRE distros shipping KDE to UPDATE their packages. That can be
> made
> easily through CMakeFiles (if you ship KDE 4.8, then you must have certain
> versions of Soprano, Akonadi, Strigi and shared-desktop-ontologies)
> - You MAKE a "Update my Ontologies" app like what Bangarang has. That's a
> necessity.
> 
> Once you have all of this sorted out, you can really begin with bug
> triaging
> and reporting. Reporting bugs without all of these requirements unmet will
> be a
> waste of time for the reporter and for the developer.
> 
> About the Nepomuk database erasing: if I read correctly Sebastian Trueg's
> blogs
> and dev history, KDE SC 4.8 is going to be the last release that will
> require
> erasing everything to work well. The Akonadi Nepomuk Feeder is fresh code,
> made
> with something called DMS (AFAIK, replacing hand tuned SQL queries with
> queries
> generated automatically)
> 
> Please, be more constructive about how to fix this. I really hate Nepomuk
> bugs,
> I really want the thing to work, but we won't get anywhere if we just kill
> the
> thing. Remember that Nepomuk is the very thing (WinFS) that Microsoft
> FAILED to
> implement, and Sebastian Trueg has made tremendous strides to do what 
> Microsoft failed to do, with no resources, and (as of late) with no money.
> 
> -- 
> Configure bugmail: https://bugs.kde.org/userprefs.cgi?tab=email
> ------- You are receiving this mail because: -------
> You reported the bug.
Comment 123 S. Burmeister 2012-01-17 09:10:56 UTC
Martin, would you please stop quoting the full comment of somebody else!

Have a look at https://bugs.kde.org/show_bug.cgi?id=246678#c122 if you do not know what I'm talking about!

If virtuoso shows high CPU usage you have to debug it, find the queries that causes the cpu usage etc. A start would be http://kdeatopensuse.wordpress.com/2011/11/09/debugging-nepomukvirtuosos-cpu-usage/ as already pointed out.
Comment 124 Martin L ü c h e m 2012-01-17 13:19:23 UTC
Sven, 

I can see, what you pointed out. This is, what happened within the GMX client and I did not take care about. Sorry for that! But anyway, when we start to discuss about quoting like that or not, the way we communicate has reached a quality that not at all helps to solve the problem.

Two things where I wonder, how to improve the situation out of the persepctive (=role) of a user:

1. Debugging as described by your link is far too complicated to make that happen by a user.

2. How an where would I start? When would I start debugging? Which application to debug first. This is not cynism, I do think this to be a real problem for users.

/Off-Topic
Even though we are "only" users of KDE/Linux we do a real hard job. We stay on a platform (in case of KDE 4.x) that is shipped with Ubuntu but is really far away from being stable. If e.g. I try to write bug reports I even run into problems with that because I  c a n n o t  describe the bug itself appearing in a very complex system environment that is far to complecated. See 1. So by the time you wonder what you could do and find out: nothing!
/

Regards, Martin
Comment 125 Edney Matias 2012-01-17 13:42:46 UTC
Hi there.

I tried to follow the instructions to debug the problem but couldn't find the isql-vt tool neither the package that contains it. I know it's a distribution problem, but it's just another one that sums up. Running Fedora 16 here.

Regards.
Comment 126 Rex Dieter 2012-01-17 13:52:47 UTC
on fedora, 
yum install virtuoso-opensource-utils

look in /usr/libexec/virtuoso/
for isql, isqlw, inifile

I'm not sure what isql-tw is supposed to refer to, but I'm guessing just the 'isql' tool (maybe suse renamed it or something).
Comment 127 Edney Matias 2012-01-18 16:39:46 UTC
Hi there!

Trying to exec this line isql-vt -H localhost -P 1111 -U dba -P dba from the tutorial available here http://kdeatopensuse.wordpress.com/2011/11/09/debugging-nepomukvirtuosos-cpu-usage/ gives me that on Fedora 16:

[matias@padme ~]$ /usr/libexec/virtuoso/isql -H localhost -P 1114 -U dba -P dba

*** Error IM002: [iODBC][Driver Manager]Data source name not found and no default driver specified. Driver could not be loaded
at line 0 of Top-Level:

Any clues?

My virtuoso is crazy again after a restart on akonadi server from the control painel. :S

top command shows:

top - 14:38:57 up 2 days,  4:46,  3 users,  load average: 1.67, 1.59, 1.10
Tasks: 198 total,   2 running, 196 sleeping,   0 stopped,   0 zombie
Cpu(s):  2.4%us,  1.0%sy, 49.6%ni, 46.6%id,  0.0%wa,  0.3%hi,  0.1%si,  0.0%st
Mem:   3943656k total,  3776300k used,   167356k free,    52392k buffers
Swap:  4194300k total,   340968k used,  3853332k free,   990336k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                    
 1704 matias    39  19 1514m 513m 3888 S 198.5 13.3 317:24.94 virtuoso-t 

Thank you
Comment 128 Edney Matias 2012-01-18 16:52:25 UTC
two minutes after posting my last comment virtuoso shut my machine off! :S
Comment 129 Rex Dieter 2012-01-18 18:00:15 UTC
comment #127 highlights a problem in fedora's packaging that I'm fixing now (we ship only the iodbc variants of these utilities, which apparently do not work in this context).
Comment 130 Alejandro Nova 2012-01-20 00:20:53 UTC
@Edney Matias: Run the command I posted. It won't do anything about your Virtuoso problems, but it will protect your computer from overheating.
Comment 131 Edney Matias 2012-02-22 12:54:30 UTC
Hi!

I'm writing to let you know that virtuoso is fine now for a few days. I'm running Fedora 16 and here are my versions:

[matias@padme ~]$ rpm -qa | grep virtuoso
redland-virtuoso-1.0.14-1.fc16.x86_64
virtuoso-opensource-6.1.4-4.fc16.x86_64
virtuoso-opensource-utils-6.1.4-4.fc16.x86_64

[matias@padme ~]$ rpm -qa | grep akonadi
kdepimlibs-akonadi-4.8.0-1.fc16.x86_64
pykde4-akonadi-4.8.0-1.fc16.x86_64
akonadi-1.7.0-1.fc16.x86_64

[matias@padme ~]$ rpm -qa | grep kdelibs
kdelibs-devel-4.8.0-1.fc16.x86_64
kdelibs-common-4.8.0-1.fc16.x86_64
kdelibs-4.8.0-1.fc16.x86_64

[matias@padme ~]$ rpm -qa | grep kde-workspace
kde-workspace-4.8.0-7.fc16.x86_64
kde-workspace-libs-4.8.0-7.fc16.x86_64
kde-workspace-devel-4.8.0-7.fc16.x86_64

Anything else?

Thank you.
Comment 132 Alejandro Nova 2012-02-22 22:01:48 UTC
kde-runtime-4.8.0-3 ;)

Check for it.
Comment 133 Maxim 2013-11-19 20:29:52 UTC
virtuoso-t eats 50% of cpu in 4.11.2 and in dmesg

[39851.714273] virtuoso-t[12371]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f4b143aad50 error 7 in virtuoso-t[400000+b09000]
[39861.327093] virtuoso-t[12388]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f840fddbd50 error 7 in virtuoso-t[400000+b09000]
[39872.752638] virtuoso-t[12416]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f501f336d50 error 7 in virtuoso-t[400000+b09000]
[39882.341785] virtuoso-t[12452]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f538e8fdd50 error 7 in virtuoso-t[400000+b09000]
[39894.538014] virtuoso-t[12691]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fb4dc1c8d50 error 7 in virtuoso-t[400000+b09000]
[39904.505139] virtuoso-t[12728]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f42807ebd50 error 7 in virtuoso-t[400000+b09000]
[39914.684411] virtuoso-t[12773]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f9af605ad50 error 7 in virtuoso-t[400000+b09000]
[39924.794001] virtuoso-t[12800]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f0df1aaad50 error 7 in virtuoso-t[400000+b09000]
[39934.491591] virtuoso-t[12837]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fc61eabdd50 error 7 in virtuoso-t[400000+b09000]
[39944.314952] virtuoso-t[12853]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f724b51bd50 error 7 in virtuoso-t[400000+b09000]
[39953.429060] virtuoso-t[12881]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fecb1702d50 error 7 in virtuoso-t[400000+b09000]
[39962.463541] virtuoso-t[12910]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f21cf69dd50 error 7 in virtuoso-t[400000+b09000]
[39972.012866] virtuoso-t[12932]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f11b9f3bd50 error 7 in virtuoso-t[400000+b09000]
[39982.649058] virtuoso-t[12971]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fce9a230d50 error 7 in virtuoso-t[400000+b09000]
[39991.769957] virtuoso-t[12992]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fe2aa716d50 error 7 in virtuoso-t[400000+b09000]
[40002.143040] virtuoso-t[13026]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fc1e09b4d50 error 7 in virtuoso-t[400000+b09000]
[40012.900378] virtuoso-t[13057]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fed11668d50 error 7 in virtuoso-t[400000+b09000]
[40022.103676] virtuoso-t[13091]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f7dbf637d50 error 7 in virtuoso-t[400000+b09000]
[40032.376944] virtuoso-t[13130]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f70b8d63d50 error 7 in virtuoso-t[400000+b09000]
[40042.807790] virtuoso-t[13146]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f9d3a718d50 error 7 in virtuoso-t[400000+b09000]
[40052.312900] virtuoso-t[13173]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f3d6dd58d50 error 7 in virtuoso-t[400000+b09000]
[40062.013635] virtuoso-t[13203]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f857cea9d50 error 7 in virtuoso-t[400000+b09000]
[40073.095813] virtuoso-t[13241]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fddd00f0d50 error 7 in virtuoso-t[400000+b09000]
[40084.440517] virtuoso-t[13273]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007fbf66733d50 error 7 in virtuoso-t[400000+b09000]
[40096.103124] virtuoso-t[13300]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f3f60af0d50 error 7 in virtuoso-t[400000+b09000]
[40107.109641] virtuoso-t[13335]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f711a1e4d50 error 7 in virtuoso-t[400000+b09000]
[40116.487367] virtuoso-t[13379]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f7479bc7d50 error 7 in virtuoso-t[400000+b09000]
[40126.086257] virtuoso-t[13414]: segfault at ffffffffffffffff ip 0000000000939d75 sp 00007f25baabbd50 error 7 in virtuoso-t[400000+b09000]