Bug 317809 – qt4 "-graphicssystem trace" support

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Siarhei Siamashka 2010-04-29 18:26:40 UTC]

In Qt 4.6 a new graphicssystem called trace was introduced. It allows to record all drawing operations into a trace buffer, store it to disk. Later it can be replayed with the qttracereplay utility of Qt.

Gentoo currently does not have any ebuild for trace graphicssystem plugin and qttracereplay tool.

Reproducible: Always

Steps to Reproduce:
1. $ ./my-qt-app -graphicssystem trace
2. $ qttracereplay *.trace

Actual Results:  
$ ./my-qt-app -graphicssystem trace
Unable to load graphicssystem "trace"
$ qttracereplay *.trace
bash: qttracereplay: command not found

Expected Results:  
Trace is successfully recorded and played back

This trace/replay stuff is useful for doing profiling and performance optimizations.

[Comment 1 Markos Chandras (RETIRED) 2010-04-29 19:12:43 UTC]

we can adjust the qt-gui live ebuilds to see how that will go

[Comment 2 Markos Chandras (RETIRED) 2010-04-30 10:13:28 UTC]

Are you sure that trace exists on Qt 4.6?

* from configure script *
-graphicssystem <sys> Sets an alternate graphics system. Available options are:
                           raster - Software rasterizer
                           opengl - Rendering via OpenGL, Experimental!

There is no trace engine available on 4.6

[Comment 3 Siarhei Siamashka 2010-04-30 12:33:38 UTC]

Created attachment 229799 [details]
a hackish ebuild to provide trace graphicssystem (derived from qt-opengl)

[Comment 4 Siarhei Siamashka 2010-04-30 12:34:20 UTC]

Created attachment 229801 [details, diff]
a hackish patch for qt-assistant to provide qttracereplay tool

[Comment 5 Siarhei Siamashka 2010-04-30 12:36:31 UTC]

(In reply to comment #2)
> Are you sure that trace exists on Qt 4.6?

Yes, it exists. I have just attached the ugly hacks that I'm using now.

Of course I would prefer a clean out of the box solution, but I don't have a clear understanding about how all these qt ebuilds work.

[Comment 6 Markos Chandras (RETIRED) 2010-04-30 13:50:25 UTC]

Created attachment 229803 [details]
updated qt-gui

Ah it exists as a separate module and can't me used as default engine. I see.

Please try the attached qt-gui ebuild with trace use flag enabled an let me know if it works for you.

[Comment 7 Siarhei Siamashka 2010-05-01 15:36:35 UTC]

(In reply to comment #6)
> Please try the attached qt-gui ebuild with trace use flag enabled an let me
> know if it works for you.

Thanks, it works fine. Now in order to get a complete trace feature support, also qttracereplay tool needs to be bundled somewhere.

BTW, this tool also allows to easily compare performance of different qt graphicssystems by playing back the traces (ex. "qttracereplay -graphicssystem raster sometrace.trace" vs. "qttracereplay sometrace.trace").

[Comment 8 Markos Chandras (RETIRED) 2010-05-01 18:21:50 UTC]

Thanks a lot. Both ebuilds are now on tree. 

Reopen this bug if you have any issues 

[Comment 9 Nikos Chantziaras 2010-05-02 13:03:40 UTC]

Not sure what's going on, but qt-assistant can't be built now. emerge fails and log says:

tar xzpf /var/tmp/portage/x11-libs/qt-assistant-4.6.2-r1/distdir/qt-everywhere-opensource-src-4.6.2.tar.gz qt-everywhere-opensour
tar: qt-everywhere-opensource-src-4.6.2/tools/assistant: Not found in archive
tar: qt-everywhere-opensource-src-4.6.2/tools/pixeltool: Not found in archive
tar: qt-everywhere-opensource-src-4.6.2/tools/qdoc3: Not found in archive
tar: Exiting with failure status due to previous errors

[Comment 10 Nikos Chantziaras 2010-05-02 13:06:01 UTC]

Sorry, first line got truncated.  It's this command:

tar xzpf /var/tmp/portage/x11-libs/qt-assistant-4.6.2-r1/distdir/qt-everywhere-opensource-src-4.6.2.tar.gz qt-everywhere-opensource-src-4.6.2/configure qt-everywhere-opensource-src-4.6.2/LICENSE.GPL3 qt-everywhere-opensource-src-4.6.2/LICENSE.LGPL qt-everywhere-opensource-src-4.6.2/projects.pro qt-everywhere-opensource-src-4.6.2/src/qbase.pri qt-everywhere-opensource-src-4.6.2/src/qt_targets.pri qt-everywhere-opensource-src-4.6.2/src/qt_install.pri qt-everywhere-opensource-src-4.6.2/bin qt-everywhere-opensource-src-4.6.2/config.tests qt-everywhere-opensource-src-4.6.2/mkspecs qt-everywhere-opensource-src-4.6.2/qmake qt-everywhere-opensource-src-4.6.2/tools/assistant qt-everywhere-opensource-src-4.6.2/tools/pixeltool qt-everywhere-opensource-src-4.6.2/tools/qdoc3 qt-everywhere-opensource-src-4.6.2/tools/assistant qt-everywhere-opensource-src-4.6.2/tools/pixeltool qt-everywhere-opensource-src-4.6.2/tools/qdoc3 qt-everywhere-opensource-src-4.6.2/tools/ qt-everywhere-opensource-src-4.6.2/demos/ qt-everywhere-opensource-src-4.6.2/examples/ qt-everywhere-opensource-src-4.6.2/src/ qt-everywhere-opensource-src-4.6.2/include/ qt-everywhere-opensource-src-4.6.2/doc/

[Comment 11 Markos Chandras (RETIRED) 2010-05-02 19:18:04 UTC]

http://bugs.gentoo.org/show_bug.cgi?id=318079