Bug 435899

Summary:	plasma-systemmonitor shows wrong memory usage of shell script app that spawns subprocess
Product:	[Frameworks and Libraries] ksystemstats	Reporter:	Lê Hoàng Phương <lehoangphuongbg>
Component:	General	Assignee:	KSysGuard Developers <ksysguard-bugs>
Status:	REPORTED ---
Severity:	normal	CC:	ahiemstra, kde, plasma-bugs-null
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	pycharm in plasma-systemmonitor applications page pycharm in plasma-systemmonitor processes page pycharm in ksysguard systemd-cgls output

Description Lê Hoàng Phương 2021-04-19 02:28:12 UTC

SUMMARY
plasma-systemmonitor currently only shows the memory usage of the pycharm.sh script, which is a shell script that starts the actual JVM and loads Pycharm in a subprocess.

STEPS TO REPRODUCE
1. Open Pycharm
2. Open plasma system monitor
3. 

OBSERVED RESULT
System monitor shows memory usage of only the shell script.

EXPECTED RESULT
System monitor shows memory usage of the whole Pycharm's process tree.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.21
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.8.0-50-generic
OS Type: 64-bit

ADDITIONAL INFORMATION

The script does not use "exec" to replace the script process with the JVM process. If  I manually edit the script to use "exec", then system monitor will show the memory usage correctly.

Comment 1 David Redondo 2021-04-19 08:25:43 UTC

*** Bug 435900 has been marked as a duplicate of this bug. ***

Comment 2 David Edmundson 2021-04-19 08:41:17 UTC

On which page? 
Can you include a screenshot?

Comment 3 Lê Hoàng Phương 2021-04-21 04:15:52 UTC

Created attachment 137747 [details]
pycharm in plasma-systemmonitor applications page

Comment 4 Lê Hoàng Phương 2021-04-21 04:16:25 UTC

Created attachment 137748 [details]
pycharm in plasma-systemmonitor processes page

Comment 5 Lê Hoàng Phương 2021-04-21 04:16:53 UTC

Created attachment 137749 [details]
pycharm in ksysguard

Comment 6 Lê Hoàng Phương 2021-04-21 04:22:03 UTC

In applications page, the memory usage is only for the shell script. 

In processes page, if I filter by "pycharm", it doesn't show the subprocess of the shell script.

I attached the screenshot of pycharm in ksysguard for comparison. Ksysguard shows all the subprocesses of pycharm correctly.

Comment 7 Arjen Hiemstra 2021-04-21 08:59:01 UTC

plasma-systemmonitor should show the same in the processes page if you switch to tree style. That said, please provide the output of `systemd-cgls` when running pycharm, that will provide more information about what's going wrong in the applications page.

Comment 8 Lê Hoàng Phương 2021-04-22 04:30:05 UTC

Created attachment 137780 [details]
systemd-cgls output

Here is the output of systemd-cgls when running pycharm.

> plasma-systemmonitor should show the same in the processes page if you switch to tree style

The screenshot that I uploaded was taken with tree style. Though it seems the filter behavior of this tree is not what I expected. If a parent item matches with the filter keyword, its children should be not be filtered again. But this now becomes off-topic.