[AKosygin]

First, I would like to thank you a billion, this has saved us and we see MASSIVE performance gains. We dropped 20 points on the NIX load and no more lagging. We also tested this to work with vBulletin v2.3.2 and 2.2.x. We get 300 to 400 visitors and it was lagging until the database server was overloaded, now we are zooming by most of the time.

Originally Posted by v0id

I get safe mode errors when I set *NIX Load Limit to anything but 0. Damn.

We had similar problems, it means that the load average command belongs to root. With PHP's safe mode on, a file belonging to you can not access a file belonging to anyone else including files belonging to root. You will have to ask your server admin to turn of PHP's safe mode.

If you can not turn off safe mode, another solution is to have it read how many processes your SQL login is processing. We had to hack this hack to check that. Actually, we really hacked this hack with a bunch of functions. Maybe I will post the giant hack of this hack later when I have time to refine it a bit.