Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:51799
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 209.85.161.42 as permitted sender)
DomainKey-Status: bad
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :cc:content-type:content-transfer-encoding;
        b=D7bWrOjfHCkzKcOYn3X420zG6KXKRF4ZsxjJh+lgOTDRnzw8bXgVShYNCkyCvoj0St
         gEWYFZ/Y5ji2rW9XBkGusj+ZDsar0g9a0Zl1lvQBHRODFXDeMPbG0FukevTGiasPnrxu
         cKJ5dOVEOOrUhW/y/iKNvjmSYOoxAkCoMeknI=
MIME-Version: 1.0
In-Reply-To: <4D9849EA.9010805@nouvo.com>
References: <4D95B6AB.30608@templeet.org>
	<AANLkTin+cCYoEiWyp=oc9byPG=yWBQ5NsmCae24U7vzr@mail.gmail.com>
	<4D960169.3000400@templeet.org>
	<4D9849EA.9010805@nouvo.com>
Date: Sun, 3 Apr 2011 12:46:59 +0200
Message-ID: <BANLkTi=8rL35FL09BcdaOsW5v3UrY4zf9A@mail.gmail.com>
To: Pascal COURTOIS <Pascal.Courtois@nouvo.com>
Cc: internals@lists.php.net
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Subject: Re: [PHP-DEV] how to find a memory corruption in php ?
From: pierre.php@gmail.com (Pierre Joye)

On Sun, Apr 3, 2011 at 12:20 PM, Pascal COURTOIS
<Pascal.Courtois@nouvo.com> wrote:
> Le 01/04/2011 18:46, Pascal COURTOIS a =E9crit :
>> Le 01/04/2011 15:20, Pierre Joye a =E9crit :
>>> hi,
>>>
>>> In php 5.3+ the memory limit default is 256MB, not 128MB. 5.3 does not
>>> necessary use more memory but actually uses and reports its usage more
>>> efficiently. I would suggest to use this default value and try again.
>>
>> =A0 the exact same bug occurs whatever the limit set. Anyway, when it wo=
rks
>> it's ok with 6MB so it's not a matter of quantity obviously.
>
> further investigations show that my program uses around 3Mbytes of memory=
 BUT
> real_usage memory increases constantly which could suggest either a bug i=
n the
> zend memory manager or a very special condition in my php program making =
the
> memory manager unable to use holes in its system allocated memory.
>
> the use of gc_collect_cycles() as suggested privately does not make any d=
ifference.

Try to run it by disabling the zend memory manager:

USE_ZEND_ALLOC=3D0 valgrind php --leak-check=3Dfull sapi/cli/php ... (or
httpd if you use apache or only reproducible there)

That will tell you if there are actual leaks. See Zend/README.ZEND_MM
for more details

Cheers,
--=20
Pierre

@pierrejoye | http://blog.thepimp.net | http://www.libgd.org