shmget() failed: Invalid argument

[sh4ka]

On a RHE 5.1 + cPanel server I got this error usually from apache logs and from php -v output:

[root@server.roo393.com:~]php -v
shmget() failed:  Invalid argument
Failed to start up concurrent users module!
PHP 5.2.5 (cli) (built: May  1 2008 22:00:18)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
    with Zend Extension Manager v1.2.2, Copyright (c) 2003-2007, by Zend Technologies
    with Zend Optimizer v3.3.3, Copyright (c) 1998-2007, by Zend Technologies
[root@server.roo393.com:~]

Tried recompiling latest php 5.2.x and it is always happening while using Zend Optimizer. As you should know, optimizer is need for most web apps today... so it's a must.

Any ideas about this error?

Thanks.

[sh4ka]

It also happens with a different zend opt. version:

 shmget() failed: Invalid argument
Failed to start up concurrent users module!
PHP 5.2.5 (cli) (built: May 1 2008 22:00:18)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
with Zend Extension Manager v1.2.0, Copyright (c) 2003-2007, by Zend Technologies
with Zend Optimizer v3.3.0, Copyright (c) 1998-2007, by Zend Technologies

Any ideas?

[sh4ka]

This was a kernel memory issue.. set this at /etc/sysctl.conf and it got fixed:

kernel.shmmax = 4294967295
kernel.shmall = 268435456

Thanks!