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while true
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PostPosted: Tue Jan 22, 2013 7:09 pm    Post subject: set 'march' thing, amd 8 core Reply with quote

oi


I have new pc box and I have already gentoo running.

I am interested in those cflags
(mind you, I have no idea what this is for, I am everlasting noob)
as it is now:
CFLAGS="-march=native -O2 -pipe"
CXXFLAGS="${CFLAGS}"

I have: AMD FX(tm)-8350 Eight-Core Processor
Is my cflag ok, or could I make it better,
namely march thingy, I was not sure what to put in...

or am I being noob and '-march=native' is quite all right?

Thank you
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NeddySeagoon
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PostPosted: Tue Jan 22, 2013 10:03 pm    Post subject: Reply with quote

while true,

-march=native asks gcc to work out whats best for the CPU its running on.
You must not use -march=native if you want to use distcc. If you don't know what distcc is you are not using it.
Its a bit ugly but you can run
Code:
echo 'int main(){return 0;}' > test.c && gcc -v -Q -march=native -O2 test.c -o test && rm test.c test
to see what -march=native means for you.
The interesting part of the output is
Code:
options passed:  -v test.c -march=amdfam10 -mcx16 -msahf -mno-movbe
 -mno-aes -mno-pclmul -mpopcnt -mabm -mno-lwp -mno-fma -mno-fma4 -mno-xop
 -mno-bmi -mno-tbm -mno-avx -mno-sse4.2 -mno-sse4.1
 --param l1-cache-size=64 --param l1-cache-line-size=64
 --param l2-cache-size=512 -mtune=amdfam10 -O2

on my Phenom II. Yes, I could put all that in place of -march=native but most readers would think I was a ricer.

Post the output of
Code:
emerge --info
if you would like your setup looked over.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
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while true
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PostPosted: Tue Jan 22, 2013 10:19 pm    Post subject: Reply with quote

hello again NeddySeagoon,
Code:
kishta grom # emerge --info
Portage 2.1.11.31 (default/linux/amd64/10.0/desktop, gcc-4.6.3, glibc-2.15-r3, 3.6.11-gentoo x86_64)
=================================================================
System uname: Linux-3.6.11-gentoo-x86_64-AMD_FX-tm-8350_Eight-Core_Processor-with-gentoo-2.1
Timestamp of tree: Tue, 22 Jan 2013 12:45:01 +0000
ld GNU ld (GNU Binutils) 2.22
app-shells/bash:          4.2_p37
dev-lang/python:          2.7.3-r2, 3.2.3
dev-util/cmake:           2.8.9
dev-util/pkgconfig:       0.27.1
sys-apps/baselayout:      2.1-r1
sys-apps/openrc:          0.11.8
sys-apps/sandbox:         2.5
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.9.6-r3, 1.11.6
sys-devel/binutils:       2.22-r1
sys-devel/gcc:            4.6.3
sys-devel/gcc-config:     1.7.3
sys-devel/libtool:        2.4-r1
sys-devel/make:           3.82-r4
sys-kernel/linux-headers: 3.6 (virtual/os-headers)
sys-libs/glibc:           2.15-r3
Repositories: gentoo x11 sunrise betagarden
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="@FREE radeon-ucode freedist"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="${EPREFIX}/etc/gconf /etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-march=native -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--jobs=4 --load-average=8.0 --autounmask=n"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://gentoo.inode.at/"
LANG="en_US.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j9"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/var/lib/layman/x11 /var/lib/layman/sunrise /var/lib/layman/betagarden"
SYNC="rsync://rsync1.at.gentoo.org/gentoo-portage"
USE="X a52 aac acl acpi alsa amd64 apache2 automount berkdb bindist bluetooth branding bzip2 cairo cdda cdr cli consolekit cracklib crypt cups cxx dbus dri dts dvd dvdr emboss encode exif fam firefox flac fortran gdbm gif gimp gpm gtk iconv ipv6 jpeg lcms ldap libnotify mad mmx mng modules mp3 mp4 mpeg mplayer mudflap multilib mysql ncurses nls nptl ogg ogv opengl openmp pam pango pcre pdf php png policykit ppds qt3support readline scanner sdl session spell sse sse2 ssl startup-notification svg tcpd tiff truetype udev udisks unicode upower usb vorbis wxwidgets x264 xcb xml xv xvid zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="evdev synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en uk us si sr" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" RUBY_TARGETS="ruby18 ruby19" USERLAND="GNU" VIDEO_CARDS="radeon" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON

kishta grom #




it is kind of late over here, I must go to bed since I have to wake up early,
and I will read thorougly your post in the morning.

Thank you
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kimmie
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PostPosted: Tue Jan 22, 2013 11:04 pm    Post subject: Reply with quote

Hey while true, I like your sig, but may I point out that with a only little more work, you can keep on ass-kicking after you're dead - fork and daemonize.
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while true
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PostPosted: Wed Jan 23, 2013 8:05 am    Post subject: Reply with quote

hello guys


Seagoon,

aha ok, I found that part:
Code:
options passed:  -v test.c -march=bdver1 -mcx16 -msahf -mno-movbe -maes
 -mpclmul -mpopcnt -mabm -mlwp -mfma -mfma4 -mxop -mno-bmi -mtbm -mavx
 -msse4.2 -msse4.1 --param l1-cache-size=16 --param l1-cache-line-size=64
 --param l2-cache-size=2048 -mtune=bdver1 -O2

so I gather I could put -march=bdver1 in?

Thank you



kimmie,

kheh, thank you. I was always interested to see what is going on behind the scene,
it is still keeping me in trouble, kheh, but if that was not the case I would not have gentoo...
(well, if weren't for YOU guys, I would not have gentoo, but I guess you see what I am aiming for)

so, fork and daemonize, ha?
kick-ass -rf nohup &&
did I get this right?
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kimmie
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PostPosted: Wed Jan 23, 2013 8:50 am    Post subject: Reply with quote

That'll do! Keep on kicking! :)
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NeddySeagoon
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PostPosted: Wed Jan 23, 2013 7:32 pm    Post subject: Reply with quote

while true,

Your emerge --info looks good.

There is often a latency problem with gcc and -march=native. The is cause by the time between CPU releases and the changes to gcc so that -march=native works correctly.
-march=bdver1 is for AMD CPUs without the 3DNow and 3Dnowext in their /proc/cpuinfo flags entries.

Check that and yes, you could use
Code:
-march=bdver1
I don't know if that would drop any of the other settings though.
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blain3
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PostPosted: Thu Jan 24, 2013 1:37 am    Post subject: Reply with quote

I was also curious about this and was about to install xorg / nvidia drivers and a few other random things, and set the flag before and ~300 packages were torn through in about the same time as usual, maybe even a bit faster but nothing major so I would say if its working and your not compiling for other arch's your fine. At least my opinion anyhow, with 8 cores just make sure to set your MAKEOPTS="-j9" or so (I'm really not clear how this variable works as I've used it set at anywhere from 2 to 19 and have yet to see anything major) and compile in tmpfs (this made the most impact with my system) is what i do. I'm using a 3rd gen i7 though, not an AMD so perhaps it's different.
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