Could just as easily launch N sub-processes from run-tests.php as well. I compile php in a VM with -j 40 on a dual core VM powered by quad core chip...
The number of simultaneous tests doesn't need to line up with CPU counts... -Clint On Oct 18, 2012, at 7:28 AM, "Pierre Joye" <pierre....@gmail.com> wrote: > hi! > > On Wed, Oct 17, 2012 at 5:41 PM, zoe slattery <aparac...@gmail.com> wrote: >> Nuno - just a PS to the last note. It is (mainly) the task allocation across >> processors which means that running tests in parallel on a 4-way machine is >> not 4 times as fast as running them in sequence. >> >> Here are some results from a run on my 2-way Mac - >> http://static.inky.ws/image/3257/image.jpg. The blocks of colour are just >> representations of the time it takes a group to run - and Open office is >> allocating the colors randomly so they don't have any significance. I've >> annotated the chart to show which groups are taking a long time.... >> >> The net is that P0 runs its half of the tasks and then just hangs about >> waiting for P1 to finish :-/. >> >> I have added a 'debug' flag to the code which will print information about >> how tasks are allocated if anyone wants to try on a 4 or 8 way. Given that >> there are not many groups that take a long time to run the simplest thing >> seems to be to map these to specific processors - that's easy enough and >> requires no difficult code. There are more elegant solutions of course. > > > Have you considered doing it using a daemon and php as client (to > launch tasks and the tests)? Gearman or even a webserver could do a > better job without the hassle to deal with what you are experiencing > now. We do that using webservers in our labs to test all phpt and > various apps. > > That being said, to multiply cores never bring a linear speed > increase, even less in this case. > > Cheers, > -- > Pierre > > @pierrejoye | http://blog.thepimp.net | http://www.libgd.org > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
