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Date: Thu, 18 Oct 2012 14:28:09 +0200
Message-ID: <CAEZPtU4YLExeTcqRzyz3_rkXFsGLRy2Cmv5iKuyC=n-CULMyHA@mail.gmail.com>
To: zoe slattery <aparachic@gmail.com>
Cc: Nuno Lopes <nlopess@php.net>, internals@lists.php.net, PHP QA <php-qa@lists.php.net>
Content-Type: text/plain; charset=ISO-8859-1
Subject: Re: [PHP-QA] Re: [PHP-DEV] Re: [PHP-QA] Parallel run-tests
From: pierre.php@gmail.com (Pierre Joye)

hi!

On Wed, Oct 17, 2012 at 5:41 PM, zoe slattery <aparachic@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