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Date: Thu, 15 Apr 2010 09:39:15 +0200
Message-ID: <k2pb54d0abe1004150039rbd189087z4a09a726796a74b1@mail.gmail.com>
To: =?UTF-8?B?SsOpcsO0bWUgTG95ZXQ=?= <jerome@loyet.net>
Cc: =?UTF-8?B?5ruV6Lev6YGl?= <tly.phpfans@gmail.com>, 
	Rasmus Lerdorf <rasmus@lerdorf.com>, internals@lists.php.net
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Subject: Re: [PHP-DEV] One suggestion to PHP-FPM
From: tyra3l@gmail.com (Ferenc Kovacs)

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On Thu, Apr 15, 2010 at 9:25 AM, J=C3=A9r=C3=B4me Loyet <jerome@loyet.net> =
wrote:

> 2010/4/15 Ferenc Kovacs <tyra3l@gmail.com>:
> >
> >
> > On Thu, Apr 15, 2010 at 9:09 AM, Ferenc Kovacs <tyra3l@gmail.com> wrote=
:
> >>
> >>
> >> 2010/4/15 J=C3=A9r=C3=B4me Loyet <jerome@loyet.net>
> >>>
> >>> 2010/4/15 =E6=BB=95=E8=B7=AF=E9=81=A5 <tly.phpfans@gmail.com>:
> >>> > We check error log after our server crashed, and we found that php
> heap
> >>> > memory is out of limit,
> >>> > so I think imagick use emalloc to allocate php heap memory, to chec=
k
> >>> > the
> >>> > zend_memory_usage is
> >>> > not a method for imagick, other circumstances which occupy huge
> memory
> >>> > can
> >>> > use this method to
> >>> > ensure the system have enough free memory.
> >>>
> >>> OK,
> >>>
> >>> one thing I didn't understand is "why should you want check de zend
> >>> memory usage when there is a memory_limit parameter in PHP.ini " ?
> >>> does'nt it do the same at PHP layer when allocating ?
> >>>
> >>
> >> Obviously you didn't read the original mail, and the links inside:
> >>
> >>
> http://groups.google.com/group/highload-php-en/browse_thread/thread/1882a=
3b2257dcc5c/ea73892cea011541?lnk=3Dgst&q=3Dgaochunhui#ea73892cea011541
> >>
> >> The problem here is that PHP wouldn't free any allocated memory untill
> >> the process exits, so there's the risk of memory exhaustion if too
> >> many PHP processes were running, even though each process wouldn't
> >> exceed PHP's memory_limit.
> >>
> >> My suggestion is more about releasing the allocated memory as soon as
> >> possible. That is, this option is similar to "max_requests".
> >>
> >> PHP-FPM would kill the PHP process if the requests a process handled
> >> exceed max_requests, and similarly, PHP-FPM should kill the PHP
> >> process whose memory usage exceeds "exit_on_memory_exceeds".
> >>
> >> So one of your lib (for example imagick) leaks memory, on the long run=
,
> it
> >> will exhaust the memory limit, and will kill a totaly request.
> >> You can set that how many request should be served with one worker, bu=
t
> >> you can't soft limit it's memory consumption.
> >> This is what the patch does:
> >> if you set the hard limit: (memory_limit) you can guarante that no
> process
> >> will use more memory, because if it tries, it will fail.
> >> and you can set soft limit, if that reached, the process will die and
> >> respawn after finishing the current request.
> >>
> >> Tyrael
> >
> > Btw: did you know about
> > http://php.net/manual/en/function.apache-child-terminate.php I just
> noticed
> > a few days ago, obviously, you can't use with cgi/fastcgi/php-fpm but f=
or
> > apache, it does exactly what you need, except that you have to execute
> from
> > userland.
>
> This function is interesting but it's called from php scripts. When
> you are a sysadmin who host hundreds of different customers, you can't
> garanty each customer will call this function each time he uses
> consomption scripts.
>
Yeah, I know, and I think I did mention that, but this sounds like a good
feature in the language, but sadly it has too many limitation in it's
current form. (no windows support, only works with apache)

Tyrael

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