When I start KAlgebra, It doesn't show up on the screen right away. It loads for a very long time (about 9 minutes), and while it loads it uses 100% of resources on my first CPU core (I have AMD Athlon 2 X3 455 CPU). Reproducible: Always Steps to Reproduce: 1. Just start KAlgebra. Actual Results: KAlgebra loaded after 9 minutes during which it used 100% of CPU resources (on the first core). Expected Results: It should have loaded much faster, after like 2 seconds. CPU: AMD Athlon 2 X3 455 3.3 GHz GPU: NVIDIA GeForce 9500GT Distro: Linux Mint 16 KDE (64-Bit)
That shouldn't be happening, here it starts instantly. Can you provide more information maybe?
(In reply to comment #1) > That shouldn't be happening, here it starts instantly. > > Can you provide more information maybe? I don't know what else to post. What other info should I post? By the way, I just found another bug in KAlgebra: I click on the dictionary tab, and then I click on the word "sin", and the program hangs forever. The CPU usage also goes up to 100%. It happens every time I do this. Should I file this bug also? Please let me know what other info would be helpful.
(In reply to comment #1) > Can you provide more information maybe? I started the program, and while it hanged at the start, I interrupted it with Ctrl+C so I could do a backtrace. Here's the backtrace: Starting program: /usr/bin/kalgebra [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGINT, Interrupt. 0x00007ffff36463c9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 Thread 1 (Thread 0x7ffff7fb67c0 (LWP 5468)): #0 0x00007ffff36463c9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff40476fb in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #2 0x00007ffff40478bd in QString::arg(QString const&, int, QChar const&) const () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #3 0x00007ffff5c43aab in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #4 0x00007ffff5c4b88f in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #5 0x00007ffff5c4cf00 in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #6 0x00007ffff5c4d576 in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #7 0x00007ffff5c4dd60 in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #8 0x00007ffff5c4f945 in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #9 0x00007ffff5c4fce8 in QXmlSimpleReader::parse(QXmlInputSource const*, bool) () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #10 0x00007ffff5c39124 in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #11 0x00007ffff5c3c834 in ?? () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #12 0x00007ffff5c3c8cb in QDomDocument::setContent(QString const&, bool, QString*, int*, int*) () from /usr/lib/x86_64-linux-gnu/libQtXml.so.4 #13 0x000000000042deaf in MmlDocument::setContent(QString, QString*, int*, int*) () #14 0x000000000042e003 in QtMmlWidget::setContent(QString const&, QString*, int*, int*) () #15 0x000000000041b49a in Dictionary::Dictionary (this=0xcdae90, p=<optimized out>) at ../../src/dictionary.cpp:85 #16 0x0000000000419fde in KAlgebra::KAlgebra (this=0x889780, parent=<optimized out>) at ../../src/kalgebra.cpp:336 #17 0x0000000000415526 in main (argc=1, argv=0x7fffffffddb8) at ../../src/main.cpp:37 A debugging session is active. Inferior 1 [process 5468] will be killed. Quit anyway? (y or n)
Here's a backtrace with qt debufg symbols installed: Program received signal SIGINT, Interrupt. replaceArgEscapes (s=..., d=..., field_width=field_width@entry=0, arg=..., larg=..., fillChar=...) at tools/qstring.cpp:6462 6462 tools/qstring.cpp: No such file or directory. Thread 1 (Thread 0x7ffff7fb67c0 (LWP 12718)): #0 replaceArgEscapes (s=..., d=..., field_width=field_width@entry=0, arg=..., larg=..., fillChar=...) at tools/qstring.cpp:6462 #1 0x00007ffff40478bd in QString::arg (this=this@entry=0x7fffffffd2f0, a=..., fieldWidth=fieldWidth@entry=0, fillChar=...) at tools/qstring.cpp:6585 #2 0x00007ffff5c43aab in QXmlSimpleReaderPrivate::isExpandedEntityValueTooLarge (this=this@entry=0xd355f0, errorMessage=errorMessage@entry=0x7fffffffd4d0) at sax/qxml.cpp:6656 #3 0x00007ffff5c4b88f in QXmlSimpleReaderPrivate::parseEntityDecl ( this=this@entry=0xd355f0) at sax/qxml.cpp:6781 #4 0x00007ffff5c4cf00 in QXmlSimpleReaderPrivate::parseMarkupdecl ( this=this@entry=0xd355f0) at sax/qxml.cpp:5399 #5 0x00007ffff5c4d576 in QXmlSimpleReaderPrivate::parseDoctype ( this=this@entry=0xd355f0) at sax/qxml.cpp:5033 #6 0x00007ffff5c4dd60 in QXmlSimpleReaderPrivate::parseProlog (this=0xd355f0) at sax/qxml.cpp:3788 #7 0x00007ffff5c4f945 in QXmlSimpleReaderPrivate::parseBeginOrContinue ( this=this@entry=0xd355f0, state=state@entry=0, incremental=incremental@entry=false) at sax/qxml.cpp:3493 #8 0x00007ffff5c4fce8 in QXmlSimpleReader::parse (this=<optimized out>, input=0x7fffffffd900, incremental=<optimized out>) at sax/qxml.cpp:3447 #9 0x00007ffff5c39124 in QDomDocumentPrivate::setContent ( this=this@entry=0xd35400, source=source@entry=0x7fffffffd900, reader=reader@entry=0x7fffffffd8a0, errorMsg=errorMsg@entry=0x0, errorLine=errorLine@entry=0x0, errorColumn=errorColumn@entry=0x0) at dom/qdom.cpp:6248 #10 0x00007ffff5c3c834 in QDomDocumentPrivate::setContent (this=0xd35400, source=source@entry=0x7fffffffd900, namespaceProcessing=namespaceProcessing@entry=false, errorMsg=errorMsg@entry=0x0, errorLine=errorLine@entry=0x0, errorColumn=errorColumn@entry=0x0) at dom/qdom.cpp:6228 #11 0x00007ffff5c3c8cb in QDomDocument::setContent (this=0x7fffffffd9c0, text=..., namespaceProcessing=<optimized out>, errorMsg=0x0, errorLine=0x0, errorColumn=0x0) at dom/qdom.cpp:6680 #12 0x000000000042deaf in MmlDocument::setContent(QString, QString*, int*, int*) () #13 0x000000000042e003 in QtMmlWidget::setContent(QString const&, QString*, int*, int*) () #14 0x000000000041b49a in Dictionary::Dictionary (this=0xcdb350, p=<optimized out>) at ../../src/dictionary.cpp:85 #15 0x0000000000419fde in KAlgebra::KAlgebra (this=0x88b3e0, parent=<optimized out>) at ../../src/kalgebra.cpp:336 #16 0x0000000000415526 in main (argc=1, argv=0x7fffffffddb8) at ../../src/main.cpp:37
Looks like a but in QtMmlWidget, will look into this. Thanks for the bug report!!
I can confirm this bahaviour for Kubuntu 13.10. KAlgebra takes several minutes to start and produces a high CPU load while loading.
this bug has a duplicate one: https://bugs.kde.org/show_bug.cgi?id=329035. i can confirm very slow start and 100% cpu usage in kalgebra 4.12.1 in official archlinux package.
*** Bug 330339 has been marked as a duplicate of this bug. ***
*** Bug 329035 has been marked as a duplicate of this bug. ***
Confirming for mint 16 xfce 64-bit here. Fully uses 1 core and, in my case, hasn't ever started. IMHO, importance should be changed to critical (or grave).
I downloaded the source for 4.11.2; and have the same problem. I commented out the dictionary tab and it seemed to fix the problem. It looks like it takes it forever to parse some xml to build the dictionary tab.
Git commit f97018ef87aef2dd6e40f4d62a88aad90f2ccf38 by Aleix Pol. Committed on 11/03/2014 at 00:37. Pushed by apol into branch 'master'. Stop depending on QtMMLWidget It was a nice idea, sadly it was not maintained (AFAIK) and it ended up deeply breaking KAlgebra startup. Not worth it, so long. :/ M +0 -4 CMakeLists.txt M +0 -1 src/CMakeLists.txt M +0 -10 src/dictionary.cpp M +0 -2 src/dictionary.h http://commits.kde.org/kalgebra/f97018ef87aef2dd6e40f4d62a88aad90f2ccf38