Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:75346
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: unknown (pb1.pair.com: domain php.net does not designate 212.55.154.24 as permitted sender)
Message-ID: <05091D9021CD48208FCE220DE1CCC3CE@pc07654>
To: <internals@lists.php.net>
Cc: <mike@php.net>,
	"Sara Golemon" <pollita@php.net>
References: <CALJZF3hXcsFiShTeOj5LjGEeUwO2TgiAiGT_OPJW3owjhQ-K5w@mail.gmail.com> <CAESVnVqwL-3-n-ZMxnmCJ=u9z0CO1Lm9ZmSuV62OTy_kajSJ3Q@mail.gmail.com>
In-Reply-To: <CAESVnVqwL-3-n-ZMxnmCJ=u9z0CO1Lm9ZmSuV62OTy_kajSJ3Q@mail.gmail.com>
Date: Wed, 9 Jul 2014 19:49:25 +0100
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="utf-8";
	reply-type=original
Content-Transfer-Encoding: 7bit
Subject: Re: [PHP-DEV] Concurrency support for run-tests
From: nlopess@php.net ("Nuno Lopes")

> On Mon, Jul 7, 2014 at 6:53 AM, Michael Wallner <mike@php.net> wrote:
>> I also have a patch for run-tests sitting around for quite some time, 
>> which
>> adds concurrent test execution support. I already fixed a lot of non
>> re-entrant tests in the past, but there might still be quite some of 
>> them.
>>
> HHVM uses PHP's test suite and runs them in parallel.  We upstreamed a
> number of fixes for tests to make these behave properly (many tests
> used common, generic filenames like "test.txt" which would clobber
> over each other when run concurrently).  Would love to see PHP eat up
> a few more cores too.

The other problem regarding running tests in parallel are DB extensions. 
Many DB tests use the same tables.  Or extensions that create sockets on the 
same port (e.g., ftp).
Having thought a bit about the subject, the heuristic I came up with was to 
1) do not run tests from the same extension in parallel, and 2) do not run 
tests from certain extensions in parallel (e.g., mysql and pdo_mysql).

BTW, I made this patch in 2007 for run-tests.php that was a naive 
parallelization of the system:
http://gcov.php.net/~nlopess/multi_threaded_run_tests.txt

Nuno