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rhill
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PostPosted: Thu Dec 30, 2010 11:39 pm    Post subject: Reply with quote

mv wrote:
As far as I can see the problems with LTO are mainly package-specific or libtool related. I used it together with -fwhole-program for testing, and more than 50% of the packages have no problems with it. Especially: If they compile then they work. Those packages which fail usually only have a problem with shell syntax (=libtool related) or with the missing -fpic (=libtool related). (Some libraries do not like -fwhole-program, of course...). If there is an interest, I can post my mask-file of non-working packages.


+50% of packages working is not a glowing endorsement for enabling it globally. :wink: My point was that if you found it broken before, it's still broken in 4.5.2, and in my opinion, yes it is broken.

Are you checking that the proper flags are actually getting passed during the linking stage? My experience is that a lot of packages didn't get this right, but that was with pre-libtool-2.4. Are you setting LDFLAGS as well as CFLAGS? Are you using ld or gold?

The fact that LTO can't be used with -march=native or -g makes it a no brainer in my case, and the huge number of LTO bugs fixed for 4.6 just reinforces it. YMMV.

(Speaking of 4.6, the svn ebuild is just about ready. Sorry it's so late, I've been sorting out the cloog/cloog-ppl mess.)
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Genewb
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PostPosted: Fri Dec 31, 2010 8:01 am    Post subject: Reply with quote

kernelOfTruth wrote:
[...]
-floop-parallelize-all
Use the Graphite data dependence analysis to identify loops that can be parallelized. Parallelize all the loops that can be analyzed to not contain loop carried dependences without checking that it is profitable to parallelize the loops.

Quote:
-ftree-parallelize-loops=n
Parallelize loops, i.e., split their iteration space to run in n threads. This is only possible for loops whose iterations are independent and can be arbitrarily reordered. The optimization is only profitable on multiprocessor machines, for loops that are CPU-intensive, rather than constrained e.g. by memory bandwidth. This option implies -pthread, and thus is only supported on targets that have support for -pthread.


@all:

any experience with these ?

are they already stable to use for world or specific packages ?

I tried -floop-parallelize-all -ftree-parallelize-loops=4 on desmume a while back, which decreased fps by about 1/3. Methinks that future "checking that it is profitable to parallelize the loops" will make it a tad more useful.
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cruzki123
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PostPosted: Fri Dec 31, 2010 10:27 pm    Post subject: Reply with quote

mv wrote:
dirtyepic wrote:
no patches for LTO. So it's still broken.

As far as I can see the problems with LTO are mainly package-specific or libtool related. I used it together with -fwhole-program for testing, and more than 50% of the packages have no problems with it. Especially: If they compile then they work. Those packages which fail usually only have a problem with shell syntax (=libtool related) or with the missing -fpic (=libtool related). (Some libraries do not like -fwhole-program, of course...). If there is an interest, I can post my mask-file of non-working packages.


Can you post it?¿ I'm thinking in reinstalling my testing computer and I want to try a radical approach (gcc 4.6, lto and gold) if I'll find good documentation about how to do that :twisted:
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PostPosted: Mon Jan 03, 2011 12:58 am    Post subject: Reply with quote

I don't think my gcc-4.5 was built with gold! I'm rebuilding it now. It seems this is the only way to use fwhopr on kdelibs. fwpa too.
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mv
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PostPosted: Mon Jan 03, 2011 4:05 pm    Post subject: Reply with quote

cruzki123 wrote:
Can you post it?

Here you are. Maybe some of the masks are not necessary (e.g. to mask -fwhole-program for all *-libs/* packages is certainly too much; however, for most of these packages, the flag will be rather useless anyway). Also there are some packages included for which only some versions need to mask -flto, and some packages are included which need this mask only on amd64 but not on x86 (since wrong handling of fpic sometimes causes no errors on x86).
Code:
*-libs/* +fwhole-program
*-plugins/* +fwhole-program
app-admin/sudo +fwhole-program
app-arch/bzip2 +flto +fwhole-program
app-arch/cpio +flto +fwhole-program
app-arch/par2cmdline +flto +fwhole-program
app-arch/p7zip +flto +fwhole-program
app-arch/tar +fwhole-program
app-arch/sharutils +fwhole-program
app-arch/star +flto +fwhole-program
app-arch/unzip +fwhole-program
app-arch/unrar +flto +fwhole-program
app-backup/dar +flto +fwhole-program
app-cdr/cdrtools +flto +fwhole-program
app-cdr/k3b +flto +fwhole-program
app-crypt/gnupg +fwhole-program
app-crypt/pinentry +fwhole-program
app-crypt/qca +flto +fwhole-program
app-editors/kile +flto +fwhole-program
app-emulation/bochs +flto +fwhole-program
app-emulation/dosemu +flto +fwhole-program
app-emulation/vice +flto +fwhole-program
app-emulation/wine +fwhole-program
app-misc/lirc +fwhole-program
app-misc/mc +fwhole-program
app-misc/strigi +flto +fwhole-program
app-shells/bash +flto +fwhole-program
app-shells/zsh +flto +fwhole-program
app-text/a2ps +fwhole-program
app-text/aspell +flto +fwhole-program
app-text/djvu +flto +fwhole-program
app-text/ebook-tools +fwhole-program
app-text/ghostscript-gpl +flto +fwhole-program
app-text/gocr +fwhole-program
app-text/hunspell +flto +fwhole-program
app-text/poppler +flto +fwhole-program
app-text/rarian +flto +fwhole-program
app-text/recode +fwhole-program
app-text/sablotron +flto +fwhole-program
app-text/stardict +flto +fwhole-program
app-text/teckit +flto +fwhole-program
app-text/texlive-core +flto +fwhole-program
app-text/wdiff +fwhole-program
app-text/xdvik +flto +fwhole-program
app-text/xpdf +fwhole-program
dev-cpp/cairomm +flto +fwhole-program
dev-cpp/clucene +flto +fwhole-program
dev-cpp/glibmm +flto +fwhole-program
dev-cpp/gtkmm +flto +fwhole-program
dev-cpp/pangomm +flto +fwhole-program
dev-games/flatzebra +flto +fwhole-program
dev-lang/tcl +flto +fwhole-program
dev-lang/tk +flto +fwhole-program
dev-lang/perl +flto +fwhole-program
dev-lang/python +flto +fwhole-program
dev-lang/ruby +flto +fwhole-program
dev-libs/boost +flto
dev-libs/dbus-glib +flto
dev-libs/glib +flto
dev-libs/gmp +flto
dev-libs/libsigc++ +flto
dev-libs/libcdio +flto
dev-libs/libpcre +flto
dev-libs/libusb +flto
dev-libs/nspr +flto
dev-libs/ppl +flto
dev-libs/rlog +flto
dev-libs/xerces-c +flto
dev-libs/zziplib +flto
dev-lisp/clisp +flto +fwhole-program
dev-perl/* +flto +fwhole-program
dev-python/* +flto +fwhole-program
dev-scheme/guile +flto +fwhole-program
dev-tcltk/expect +flto +fwhole-program
dev-tex/luatex +flto +fwhole-program
dev-util/bdelta +flto +fwhole-program
dev-util/cmake +flto +fwhole-program
dev-util/ltrace +flto +fwhole-program
dev-util/valgrind +fwhole-program
dev-vcs/cvs +fwhole-program
dev-vcs/git +fwhole-program
dev-vcs/mercurial +flto +fwhole-program
dev-vcs/monotone +flto +fwhole-program
dev-vcs/subversion +flto +fwhole-program
games-action/gltron +flto +fwhole-program
games-arcade/kobodeluxe +fwhole-program
games-arcade/lbreakout +flto +fwhole-program
games-arcade/rocksndiamonds +fwhole-program
games-arcade/xgalaga +fwhole-program
games-emulation/advancemame +fwhole-program
games-emulation/dosbox +flto +fwhole-program
games-emulation/xmame +flto +fwhole-program
games-emulation/xmess +flto +fwhole-program
games-engines/scummvm-tools +flto +fwhole-program
games-fps/prboom +flto +fwhole-program
games-puzzle/enigma +flto +fwhole-program
games-rpg/freedroidrpg +flto +fwhole-program
gnome-base/libglade +flto +fwhole-program
kde-base/* +flto +fwhole-program
kde-misc/filelight +fwhole-program
mail-client/claws-mail +flto +fwhole-program
mail-client/pine +fwhole-program
mail-filter/maildrop +fwhole-program
media-gfx/exiv2 +flto +fwhole-program
media-gfx/gimp +flto +fwhole-program
media-gfx/graphicsmagick +flto +fwhole-program
media-gfx/imagemagick +flto +fwhole-program
media-gfx/pstoedit +flto +fwhole-program
media-gfx/sam2p +flto +fwhole-program
media-gfx/sane-backends +flto +fwhole-program
media-gfx/swftools +fwhole-program
media-gfx/transfig +flto +fwhole-program
media-libs/flac +flto
media-libs/gstreamer +flto
media-libs/jbigkit +flto
media-libs/jpeg +flto
media-libs/libcaca +flto
media-libs/libdvdread +flto
media-libs/libdvdnav +flto
media-libs/liblastfm +flto
media-libs/libmodplug +flto
media-libs/libmp4v2 +flto
media-libs/libsidplay +flto
media-libs/libv4l +flto
media-libs/mediastreamer +flto
media-libs/musicbrainz +flto
media-libs/netpbm +flto
media-libs/opencore-amr +flto
media-libs/openjpeg +flto
media-libs/plotutils +flto
media-libs/schroedinger +flto
media-libs/silgraphite +flto
media-libs/smpeg +flto
media-libs/tiff +flto
media-libs/x264 +flto
media-plugins/live +flto
media-sound/audacity +flto +fwhole-program
media-sound/audex +flto +fwhole-program
media-sound/cdparanoia +flto +fwhole-program
media-sound/gsm +flto +fwhole-program
media-sound/kradio +flto +fwhole-program
media-sound/kstreamripper +flto +fwhole-program
media-sound/lilypond +flto +fwhole-program
media-sound/musepack-tools +fwhole-program
media-sound/phonon +flto +fwhole-program
media-sound/qmmp +fwhole-program
media-sound/timidity++ +flto +fwhole-program
media-sound/vorbis-tools +flto +fwhole-program
media-sound/xmms2 +flto +fwhole-program
media-tv/kdetv +flto +fwhole-program
media-tv/v4l-utils +fwhole-program
media-tv/xawtv +flto +fwhole-program
media-video/avidemux +flto +fwhole-program
media-video/cclive +flto +fwhole-program
media-video/dirac +flto +fwhole-program
media-video/ffmpeg +flto +fwhole-program
media-video/gnome-mplayer +fwhole-program
media-video/kaffeine +flto +fwhole-program
media-video/mjpegtools +flto +fwhole-program
media-video/mplayer +flto +fwhole-program
media-video/xine-ui +flto +fwhole-program
media-video/transcode +flto +fwhole-program
media-video/vlc +flto +fwhole-program
net-analyzer/wireshark +flto +fwhole-program
net-dialup/ppp +flto +fwhole-program
net-dns/libidn +fwhole-program
net-firewall/ipsec-tools +fwhole-program
net-firewall/iptables +flto +fwhole-program
net-ftp/lftp +flto +fwhole-program
net-libs/gnutls +flto
net-libs/libetpan +flto
net-libs/libpcap +flto
net-libs/libsrtp +flto
net-libs/opal +flto
net-libs/ptlib +flto
net-libs/wvstreams +flto
net-mail/uw-mailutils +fwhole-program
net-misc/iputils +flto +fwhole-program
net-misc/nx +flto +fwhole-program
net-misc/nxcl +flto +fwhole-program
net-misc/openssh +flto +fwhole-program
net-p2p/ktorrent +flto +fwhole-program
net-print/cups +flto +fwhole-program
net-voip/yate +flto +fwhole-program
perl-core/* +flto +fwhole-program
sci-libs/cln +flto
sci-libs/gdal +flto
sci-libs/libgeotiff +flto
sci-libs/qrupdate +flto
sci-mathematics/axiom +flto +fwhole-program
sci-mathematics/ginac +flto +fwhole-program
sci-mathematics/glpk +flto +fwhole-program
sci-mathematics/scilab +fwhole-program
sci-mathematics/pari +flto +fwhole-program
sci-mathematics/octave +flto +fwhole-program
sys-apps/busybox +flto +fwhole-program
sys-apps/coreutils +fwhole-program
sys-apps/dbus +flto +fwhole-program
sys-apps/fakeroot-ng +fwhole-program
sys-apps/findutils +fwhole-program
sys-apps/grep +fwhole-program
sys-apps/groff +fwhole-program
sys-apps/hal +fwhole-program
sys-apps/hdparm +flto +fwhole-program
sys-apps/iproute2 +fwhole-program
sys-apps/less +flto +fwhole-program
sys-apps/less-select +flto +fwhole-program
sys-apps/module-init-tools +fwhole-program
sys-apps/pciutils +flto +fwhole-program
sys-apps/sandbox +fwhole-program
sys-apps/shadow +flto +fwhole-program
sys-apps/sysvinit +flto +fwhole-program
sys-apps/which +flto +fwhole-program
sys-devel/bc +fwhole-program
sys-devel/libtool +flto +fwhole-program
sys-fs/dosfstools +flto +fwhole-program
sys-fs/ddrescue +flto +fwhole-program
sys-fs/e2fsprogs +flto +fwhole-program
sys-fs/encfs +flto +fwhole-program
sys-fs/lvm2 +fwhole-program
sys-fs/mtools +flto +fwhole-program
sys-fs/squashfs-tools +flto +fwhole-program
sys-fs/udftools +flto +fwhole-program
sys-kernel/kccmp +flto +fwhole-program
sys-libs/e2fsprogs-libs +flto
sys-libs/gpm +flto
sys-libs/ncurses +flto
sys-libs/slang +flto
sys-libs/zlib +flto
sys-power/hibernate-script +fwhole-program
sys-process/lsof +fwhole-program
sys-process/procps +flto +fwhole-program
www-plugins/mozplugger +flto
www-client/dillo +flto +fwhole-program
www-client/lynx +fwhole-program
x11-base/xorg-server +fwhole-program
x11-libs/Xaw3d +flto
x11-libs/fltk +flto
x11-libs/libvdpau +flto
x11-libs/openmotif +flto
x11-libs/pango +flto
x11-libs/qt-* +flto
x11-libs/wxGTK +flto
x11-wm/fvwm +fwhole-program
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cruzki123
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PostPosted: Mon Jan 03, 2011 11:15 pm    Post subject: Reply with quote

Thanks.

I forgot to ask before, what CFLAGS and LDFLAGS are you ussing? I was thiking on ussing:

Code:

CFLAGS="-march=core2 -Ofast -pipe -ftracer -fexcess-precision=fast"
CFLAGS="${CFLAGS} -floop-interchange -floop-strip-mine -floop-block"
CFLAGS="${CFLAGS} -flto -fwhole-program

CXXFLAGS="${CFLAGS}"

LDFLAGS="${LDFLAGS} -Wl,--hash-style=gnu"
LDFLAGS="${LDFLAGS} -Wl,-flto"
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mv
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PostPosted: Tue Jan 04, 2011 9:59 pm    Post subject: Reply with quote

cruzki123 wrote:
I forgot to ask before, what CFLAGS and LDFLAGS are you using?

It depends very much on the package: I have a huge file of masks; I have only separated the -flto and -fwhole program flags into their own mask-file, because they need to be masked so often. For the majority of packages (which I do not care so much about) I use most flags which do not add too much in executable size and some flags which improve security (like -fstack-protector, -D_FORTIFY_SOURCE=2, or the combination -Wl,-z,now -Wl,-z,relro; partly, these are now default in gentoo, but I prefer to keep them anyway); something like
Code:
CFLAGS="-march=native -O2 -fno-ident -pipe -D_FORTIFY_SOURCE=2 -fstack-protector -fomit-frame-pointer -ffast-math -combine -fmerge-all-constants -fgcse-sm -fgcse-las -frename-registers -fweb -finline-functions -fgcse-after-reload -fpredictive-commoning -fdirectives-only -ftree-switch-conversion -fgraphite-identity -floop-interchange -floop-strip-mine -floop-block -flto -fwhole-program"
CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden -fno-enforce-eh-specs"
LDFLAGS="${CFLAGS resp. CXXFLAGS} -Wl,--hash-style=gnu -Wl,--sort-common -Wl,-O9 -Wl,--enable-new-dtags -Wl,-z,now -Wl,-z,relro -Wl,-z,combreloc -Wl,--relax -flto -fwhole-program"

But expect breakage if you use all this stuff on critical packages, especially on packages which are not very really cleanly written: Better do not use it unless you know what you are doing.
Quote:
I was thiking on ussing:
Code:

CFLAGS="-march=core2 -Ofast -pipe -ftracer -fexcess-precision=fast"

I don't know what -Ofast should mean. -ftracer can also slow down things and might need more memory; I do not use it anymore. -fexcess-precision=fast should be the default; if some project changes it explicitly, I would not recommend to override the project's decision.
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kernelOfTruth
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PostPosted: Tue Jan 04, 2011 10:09 pm    Post subject: Reply with quote

Quote:
A new general optimization level, -Ofast has been introduced. It combines the existing optimization level -O3 with options that can affect standards compliance but result in better optimized code. For example -Ofast enables -ffast-math.


so not really much change compared to -O3 and -ffast-math ;)

mv, you have some really nice flags, especially the -fmerge-all-constants flag looks promising and -fdirectives-only
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Last edited by kernelOfTruth on Wed Jan 05, 2011 9:04 am; edited 1 time in total
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rhill
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PostPosted: Wed Jan 05, 2011 4:31 am    Post subject: Reply with quote

There is a very good white paper on LTO, its deficiencies in 4.5, and case studies of real world usage here:

http://gcc.gnu.org/wiki/summit2010?action=AttachFile&do=view&target=hubicka.pdf
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mv
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PostPosted: Wed Jan 05, 2011 4:39 pm    Post subject: Reply with quote

kernelOfTruth wrote:
Quote:
A new general optimization level, -Ofast has been introduced.

In my gcc-4.5.2, this flag is neither documented nor understood.
Quote:
-fmerge-all-constants flag looks promising and -fdirectives-only

The -fdirectives-only is there mainly to speed up ccache, but several packages break with it (my mask-file contains 11 packages for it, among them important things like coreutils, gettext, dash, parted). The -fmerge-all-constants is probably rather useless since string constants are merged anyway and other constants are not used very often; however, I do not know a package which has problems with it (although of course, in theory, there might be subtle runtime problems if constants are re-cast and modified).
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PostPosted: Wed Jan 05, 2011 6:01 pm    Post subject: Reply with quote

mv wrote:
kernelOfTruth wrote:
Quote:
A new general optimization level, -Ofast has been introduced.

In my gcc-4.5.2, this flag is neither documented nor understood.


http://gcc.gnu.org/gcc-4.6/changes.html

Seems to be introduced (planned?) in 4.6 series, so it rather won't work with 4.5.2 :roll:
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PostPosted: Mon Jan 10, 2011 1:14 pm    Post subject: Reply with quote

anyone using the ~x86 or ~amd64 arch ?

dev-libs/cloog-ppl changed to

dev-libs/ppl (0.11)

and

dev-libs/cloog (0.16.1)

the dependencies haven't been updated / fixed in gcc yet

any experience with that move ?
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Fred Krogh
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PostPosted: Mon Jan 10, 2011 3:39 pm    Post subject: Reply with quote

This has bitten me, and I'm unclear on what to do about it. More detail here: http://forums.gentoo.org/viewtopic-t-859449.html
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PostPosted: Mon Jan 10, 2011 4:50 pm    Post subject: Reply with quote

Fred Krogh wrote:
This has bitten me, and I'm unclear on what to do about it. More detail here: http://forums.gentoo.org/viewtopic-t-859449.html


I remerged dev-libs/cloog-ppl without my graphite flags, then restored them back as before.
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PostPosted: Mon Jan 10, 2011 5:23 pm    Post subject: Reply with quote

This
Quote:
# env USE="-graphite" emerge -av cloog-ppl

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild R ] dev-libs/cloog-ppl-0.15.10 USE="-static-libs" 0 kB

Does not show cloog-ppl depending on the graphite use flag, and fails to emerge with
Quote:
/var/tmp/portage/dev-libs/cloog-ppl-0.15.10/work/cloog-ppl-0.15.10/source/names.c: In function 'cloog_names_scalarize':
/var/tmp/portage/dev-libs/cloog-ppl-0.15.10/work/cloog-ppl-0.15.10/source/names.c:526:6: sorry, unimplemented: Graphite loop optimizations cannot be used
make[1]: *** [names.lo] Error 1
make[1]: Leaving directory `/var/tmp/portage/dev-libs/cloog-ppl-0.15.10/work/cloog-ppl-0.15.10_build'
make: *** [all-recursive] Error 1
emake failed
It seems that I need more than this.
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Moonboots
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PostPosted: Mon Jan 10, 2011 5:36 pm    Post subject: Reply with quote

Sorry if i didn't make it clear enough, but what i meant was graphite's CFLAGS ie -floop-interchange etc
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PostPosted: Mon Jan 10, 2011 7:14 pm    Post subject: Reply with quote

Thanks for making this clear. This solution works for me as well.
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kernelOfTruth
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PostPosted: Mon Jan 10, 2011 7:25 pm    Post subject: Reply with quote

for future reference:
why you should keep multiple gcc versions around (a case study in stupidity)
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PostPosted: Mon Jan 10, 2011 10:27 pm    Post subject: Reply with quote

kernelOfTruth wrote:
anyone using the ~x86 or ~amd64 arch ?

dev-libs/cloog-ppl changed to

dev-libs/ppl (0.11)

and

dev-libs/cloog (0.16.1)

the dependencies haven't been updated / fixed in gcc yet

any experience with that move ?


uh, no it didn't. :o ppl was version bumped. so was cloog-ppl. there's no change in dependencies.

you don't need cloog installed, at least not until 4.7 rolls around.
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PostPosted: Mon Jan 10, 2011 10:59 pm    Post subject: Reply with quote

dirtyepic wrote:
kernelOfTruth wrote:
anyone using the ~x86 or ~amd64 arch ?

dev-libs/cloog-ppl changed to

dev-libs/ppl (0.11)

and

dev-libs/cloog (0.16.1)

the dependencies haven't been updated / fixed in gcc yet

any experience with that move ?


uh, no it didn't. :o ppl was version bumped. so was cloog-ppl. there's no change in dependencies.

you don't need cloog installed, at least not until 4.7 rolls around.


thanks for that clarification dirtyepic ! :)
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PostPosted: Wed Jan 12, 2011 8:15 am    Post subject: Reply with quote

Is the official GCC guide still up to date? It hasn't been updated in a while and I thought maybe things have changed since then. http://www.gentoo.org/doc/en/gcc-upgrading.xml
Basically I'm wondering if this is still the recommended approach:
Code:
# emerge -uav gcc
# gcc-config <new gcc>
# env-update && source /etc/profile
# emerge --oneshot -av libtool
# emerge -eav system
# emerge -eav world
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PostPosted: Wed Jan 12, 2011 4:24 pm    Post subject: Reply with quote

(Following the) Guide is pointless unless you want to contribute to the stabilisation of a ~arch GCC version. Just ftr, I once read a very sophisticatedly optimised way of rebuilding world that at least didn't rebuild packages twice. Must be lurking around somewhere in the Documentation sub.
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PostPosted: Thu Jan 13, 2011 9:21 am    Post subject: Reply with quote

genstorm wrote:
(Following the) Guide is pointless unless you want to contribute to the stabilisation of a ~arch GCC version. Just ftr, I once read a very sophisticatedly optimised way of rebuilding world that at least didn't rebuild packages twice. Must be lurking around somewhere in the Documentation sub.


I feel that what you say and this quote from the guide
Quote:
To be completely safe that your system is in a sane state, you must rebuild the toolchain and then world to make use of the new compiler.
clash a bit. Not saying that you're wrong, but I don't see how both statements ("It's pointless" vs "you must"). can be true.
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PostPosted: Thu Jan 13, 2011 9:52 am    Post subject: Reply with quote

Well "you must" only to "be completely safe".

"It's pointless" is an observation I've made after dozens of minor and major version changes between 4.0.sth and 4.5.2 right now.
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PostPosted: Sat Jan 15, 2011 6:46 am    Post subject: Reply with quote

the `emerge system` then `emerge world` is pretty pointless, but everything else in that list is necessary. there are libraries (including some related to gcc itself (see: cloog-ppl/ppl)) which all need to be built with the same compiler version to work properly together. Qt is a big one if I remember correctly.

plus it makes you guys hit the bugs right away so we have something to do.
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