Re: Questions regarding limits of processes launched by system, exec,passthru ...

[email protected] (Valentin Schmid - ICSurselva AG) Mon, 29 Sep 2008 09:56:08 +0200
Newsgroups	php.install
Message-ID	<[email protected]>
Hello all again,

It seems that Problem can only be solved by one of the following ways:

1. Don't use mod_php; use CGI or FastCGI instead. Then it would be
    possible to limit the resources via RLimitCPU / RLimitMEM.

2. Use one of the following apache core patch
     http://archives.neohapsis.com/archives/openbsd/2005-12/1436.html
    or the following apache module:
     http://www.ucc.asn.au/~dagobah/things/mod_rlimit.c
    (Unfortunately only for apache 1.3)

Thanks for all your answers.

Kind regards
valli

> Hello all,
> 
> Is there a way to limit the memory consumption and / or the CPU
> consumption of processes launched by the php functions system,
> exec, passthru, proc_open and shell_exec?
> 
> We use mod_php with an apache (mpm-prefork) on Linux.
> 
> The following settings don't have any effect at all:
> PHP:
>   max_execution_time 30
>   memory_limit 8M
> Apache:
>   RLimitCPU 30 30
>   RLimitMEM 8388608 8388608
> 
> The limits above do have effect on php-scripts (without system calls)
> and on CGIs (as well on processes launched by CGIs).
> 
> Any Ideas?
> 
> Kind Regards
> valli
> 
> 
> PS: I tested it with the following two scripts:
> system_memorytest.php
> =====================
> <html>
> <head>
>   <title>php-systemcall-memory test</title>
> </head>
> <body>
>   php-systemcall-memory test<br>
>   ... and here's the system call:<br>
>   <pre>
> <?php
>    $cmd = '/usr/bin/perl -e \'
>       $| = 1;
>       print "start of the systemcall<br>\n";
>       $s = "teststr_";
>       while (1) {
>          print "len=".length($s)."<br>\n";
>          sleep(1);
>          $s .= $s;
>       }
>    \'';
>    print htmlspecialchars($cmd);
> ?>
>   </pre>
> <?php
>   ob_flush();
>   flush();
>   system($cmd);
> ?>
> </body>
> </html>
> 
> 
> system_timeouttest.php
> ======================
> <html>
> <head>
>   <title>php-systemcall-timeout test</title>
> </head>
> <body>
>   php-systemcall-timeout test<br>
>   ... and here's the system call:<br>
>   <pre>
> <?php
>    $cmd = '/usr/bin/perl -e \'
>       $| = 1;
>       print "start of the systemcall<br>\n";
>       $i = 0;
>       while (1) {
>          if (($i % 10000000) == 0) {
>             print "i=".$i."<br>\n";
>          }
>          $i += 1;
>       }
>    \'';
>    print htmlspecialchars($cmd);
> ?>
>   </pre>
> <?php
>   ob_flush();
>   flush();
>   system($cmd);
> ?>
> </body>
> </html>