On May 26, 2015 11:43 PM, "Dmitry Stogov" <dmi...@zend.com> wrote: > > On Tue, May 26, 2015 at 6:24 PM, Rasmus Lerdorf <ras...@lerdorf.com> wrote: > > > On 05/26/2015 07:33 AM, Dmitry Stogov wrote: > > > Commit: 7dac4d449f72d7eb029aa1a8ee87aaf38e17e1c5 > > > Author: Dmitry Stogov <dmi...@zend.com> Tue, 26 May 2015 > > 17:33:25 +0300 > > > Parents: ca31711625095c2d6e308d7f0fc9d371ad0934d4 > > > Branches: master > > > > > > Link: > > http://git.php.net/?p=php-src.git;a=commitdiff;h=7dac4d449f72d7eb029aa1a8ee87aaf38e17e1c5 > > > > > > Log: > > > Add targets to simplify building PHP with FDO (Feedback Directed > > Optimisation) > > > PHP should be built with the folowing steps: > > > > > > make clean > > > make -j4 prof-gen > > > ; now php should be trained with some scripts > > > ; for example `sapi/cgi/php -T 1000 /var/www/http/wordpress/index.php > > > /dev/null` > > > make prof-clean > > > make -j4 prof-use > > > > > > The "properly" trained build may give up to 10% real performance boost! > > > "Improprly" trained PHP might be even slower. > > > > Whoa, really 10%? I know there is AutoFDO coming in gcc 5.1 and I didn't > > think this was really practical until then. Perhaps it is. I wonder if > > this will spur php-wordpress, php-drupal and php-mediawiki tuned builds? > > > > I hope, we will be able to identify the main sources of speed difference > and provide a source level solution that won't require FDO. > I'm going to work on this with a team of experts from Intel, but we don't > have any receipt yet. > In case anyone find something useful please share with me. > > At this point we know that FDO built inlines most memcpy() and memset() > calls. > > Training scripts may speed-up some apps and slow-down others, but it looks > like most real-life apps benefits from the the same things, while synthetic > benchmarks from something opposite. So improving real-life apps we > slow-down bench.php and back :)
It should be possible to use what we use for the windows pgo profiling build. All php code anyway: https://github.com/OSTC/pgo-scripts/blob/master/README Let me know if you like to share the same base, it could save some work.
