[opensuse-buildservice] recompiling OSS repo on local instance for different arch
Hi, I want to recompile the whole OSS 12.3 or maybe when 13.1 is out the 13.1 repo with specific optimizations (in particular for bulldozer v2 "vishera"). So when I run a VM with the OBS appliance where can I set the global flags? in /etc/rpm ? Will this even work or are the spec files full of hardcoded "if or" for x86 and x64? Thanks in advance. -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-buildservice+owner@opensuse.org
Am Montag, 16. September 2013, 16:10:36 schrieb Damian Ivanov:
Hi,
I want to recompile the whole OSS 12.3 or maybe when 13.1 is out the 13.1 repo with specific optimizations (in particular for bulldozer v2 "vishera"). So when I run a VM with the OBS appliance where can I set the global flags? in /etc/rpm ? Will this even work or are the spec files full of hardcoded "if or" for x86 and x64?
Compiler optimizations? Use OptFlags: in your prjconf. -- Adrian Schroeter email: adrian@suse.de SUSE LINUX GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg) Maxfeldstraße 5 90409 Nürnberg Germany -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-buildservice+owner@opensuse.org
(But: does the 1% speedup you get through optflag tweaking really warrant a complete distribution rebuild?) I'm quite interested in how it will affect the system actually. Especially for the bulldozer architecture various people claim 50% enhancement if used with open64 compiler and gcc 4.8 with march=bdver2 being about the same level of improvement. I am using suse since more
Michael, Adrian 1st thanks for your answers!
than 10 years now, so even a test of gentoo if there is a performance
benefit is a no go :-)
2013/9/16 Adrian Schröter
Am Montag, 16. September 2013, 16:10:36 schrieb Damian Ivanov:
Hi,
I want to recompile the whole OSS 12.3 or maybe when 13.1 is out the 13.1 repo with specific optimizations (in particular for bulldozer v2 "vishera"). So when I run a VM with the OBS appliance where can I set the global flags? in /etc/rpm ? Will this even work or are the spec files full of hardcoded "if or" for x86 and x64?
Compiler optimizations? Use OptFlags: in your prjconf.
--
Adrian Schroeter email: adrian@suse.de
SUSE LINUX GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg) Maxfeldstraße 5 90409 Nürnberg Germany
-- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-buildservice+owner@opensuse.org
On Mon, Sep 16, 2013 at 04:10:36PM +0200, Damian Ivanov wrote:
I want to recompile the whole OSS 12.3 or maybe when 13.1 is out the 13.1 repo with specific optimizations (in particular for bulldozer v2 "vishera"). So when I run a VM with the OBS appliance where can I set the global flags? in /etc/rpm ?
It's probably better to put some "Optflags" in your project config. They will be copied into rpm's rpmrc file when doing the build. The OpenSUSE:12.3 config contains: Optflags: i586 -fomit-frame-pointer -fmessage-length=0 Optflags: i686 -march=i686 -mtune=generic -fomit-frame-pointer -fmessage-length=0 Optflags: x86_64 -fmessage-length=0 Optflags: ppc -fmessage-length=0 Optflags: ppc64 -fmessage-length=0 Optflags: ia64 -fmessage-length=0 Optflags: s390 -fmessage-length=0 Optflags: s390x -fmessage-length=0 Optflags: armv5el -fmessage-length=0 Optflags: armv5tel -fmessage-length=0 Optflags: armv7l -fmessage-length=0 Optflags: armv7hl -fmessage-length=0 Optflags: sparcv9 -fmessage-length=0 -mcpu=ultrasparc Optflags: sparc64 -fmessage-length=0 -mcpu=ultrasparc Optflags: * -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables The '*' optflag is always added to the arch specific one.
Will this even work or are the spec files full of hardcoded "if or" for x86 and x64?
It should work, as for openSUSE packages it's considered a bug if the rpm optflags are not honored. (But: does the 1% speedup you get through optflag tweaking really warrant a complete distribution rebuild?) Cheers, Michael. -- Michael Schroeder mls@suse.de SUSE LINUX Products GmbH, GF Jeff Hawn, HRB 16746 AG Nuernberg main(_){while(_=~getchar())putchar(~_-1/(~(_|32)/13*2-11)*13);} -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-buildservice+owner@opensuse.org
participants (3)
-
Adrian Schröter -
Damian Ivanov -
Michael Schroeder