Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
Any system wide graphite CFLAGs recommendations?
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Portage & Programming
View previous topic :: View next topic  
Author Message
jasn
Guru
Guru


Joined: 05 May 2005
Posts: 412
Location: Maryland, US

PostPosted: Tue Dec 04, 2012 1:54 pm    Post subject: Any system wide graphite CFLAGs recommendations? Reply with quote

I was curious if there's been any consensus on graphite CFLAGs to enable. (I'm running ~amd64 gentoo-sources-3.6.8 with gcc-4.7.2 on my system.) Are;
Code:
-floop-interchange -floop-strip-mine -floop-block -fgraphite-identity

ok to enable system wide? Any pointers to the complete graphite CFLAG documentation would be helpful as well.

Thanks..
Back to top
View user's profile Send private message
Raeior
n00b
n00b


Joined: 17 Jul 2012
Posts: 2

PostPosted: Fri Dec 07, 2012 10:04 am    Post subject: Reply with quote

I'm using "-floop-interchange -floop-strip-mine -floop-block -fgraphite-identity" with GCC-4.7.2 on my laptop (march=corei7, x86-64) and it's working fine most of the time. If it has any impact on performance...no idea but probably nothing significant. But there are still packages in the tree that don't compile (dev-lang/tcl for example, also pyqt4 which hits this bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51984) or that exhibit strange runtime failures. For example I couldn't log into my machine using kdm, when compiling qt-core and qt-script with graphite flags enabled, because kinit crashed. Amarok does not start, but i'm not sure if this is related to having graphite enabled on one of it's dependencies. Libreoffice fails some of it's testcases with graphite enabled and icedtea fails bootstrapping if I remember it correctly. Dolphin and kcalc also crashed on exit when compiling qt-gui with graphite.
So this is my list of packages with graphite disabled:

dev-java/icedtea
dev-lang/tcl
dev-python/PyQt4
kde-base/kdelibs
media-sound/amarok
x11-libs/qt-core
x11-libs/qt-script

So basically you have to decide for yourself if it's worth the hassle. Depending on the stuff you have installed you might hit no problems at all, so maybe just try it out. For me it's more of a irrational "hey new stuff" decision, so I still have those flags activated even though there are bugs. All in all this led me to using creduce and trying to work my way through c++ for the first time to create a minimized testcase, which was quite interesting.

On the topic of graphite bugs, should this stuff be reported on the gentoo bugzilla or using (in case of kde bugs) the kde crashreporter? They occur because of unsupported cflags and with the exception of an ICE are harder to minimize and to pinpoint, so i wasn't sure about reporting errors like this.

For documentation you can either use http://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Optimize-Options.html for the meaning of the compiler flags or http://gcc.gnu.org/wiki/Graphite which contains links to the papers and implementation details.

Hope this helps a bit.
Raeior
Back to top
View user's profile Send private message
mv
Advocate
Advocate


Joined: 20 Apr 2005
Posts: 4134

PostPosted: Fri Dec 07, 2012 11:41 am    Post subject: Reply with quote

My list of excluded packages is similar but a bit longer (although I had no difficulties with kdelibs and qt-script so far); I use neither PyQt4 nor amarok.
/etc/portage/package.cflags/graphite wrote:
app-emulation/vice +fgraphite* +floop-*
app-office/libreoffice +fgraphite* +floop-*
dev-java/icedtea* +fgraphite* +floop-*
dev-lang/python +fgraphite* +floop-*
dev-lang/tcl +fgraphite* +floop-*
# This might be needed after an upgrade of dev-libs/ppl, since then gcc cannot use graphite optimizations:
#dev-libs/cloog-ppl +fgraphite* +floop-*
games-emulation/dosbox +fgraphite* +floop-*
games-rpg/freedroidrpg +fgraphite* +floop-*
media-gfx/gimp +fgraphite* +floop-*
media-libs/libcaca +fgraphite* +floop-*
media-sound/audacity +fgraphite* +floop-*
media-sound/timidity++ +fgraphite* +floop-*
sci-mathematics/octave +fgraphite* +floop-*
sys-devel/llvm +fgraphite* +floop-*
sys-fs/encfs +fgraphite* +floop-*
www-client/firefox +fgraphite* +floop-*
x11-libs/qt-core +fgraphite* +floop-*
Back to top
View user's profile Send private message
jasn
Guru
Guru


Joined: 05 May 2005
Posts: 412
Location: Maryland, US

PostPosted: Fri Dec 07, 2012 10:54 pm    Post subject: Reply with quote

Thanks for the replies.

While I was able to actually see some packages which wouldn't emerge while using the graphite CFLAGs, I was unaware of packages that would emerge ok, but then not run correctly, until I read this thread and this bug report, regarding libreoffice. I think for now, I'll just leave them out, until some of these issues are addressed. Also while I admit I like to turn on the new stuff, "just because", I'm not sure what benefit exists for using the graphite CFLAGs today.

Thanks again..
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Portage & Programming All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum