Valentin Schmid - ICSurselva AG
2008-09-25 08:39:03 UTC
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>
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>