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>
Well as far as I know there are already memory limits to every php
process and you define this in php.ini. I recently made a script that
used to exhaust all the given memory and I needed to increase the limit.
memory_limit = 16M
You can change this to whatever you wish to control. You can also
change these if you want to control execution time:
max_execution_time = 30 ; Maximum execution time of each script, in
seconds
max_input_time = 60 ; Maximum amount of time each script may spend
parsing request data
I haven't seen a way to control disk access space but I guess there are
two ways to do that. One is quota the space that php writes in or do
this by the programming way (meaning that you may check the space before
you write something).
As for the CPU I think there are OS specific techniques to control
resource usage in general but it depends on what *nix system you use
(FreeBSD, Linux etc).
------------
Thodoris
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