Suspension for high resources usage

[bighorn]

Hello,
This is the third time my account is suspended for high resources usage.
I understand the need of not comsuming all your system resources, but how can I find out what makes this consumption ?
First time, I new and fixed it as soon, I had a script making a lot of computation. I disabled it immediately.
Second time was less obvious and i'm not sure whether it is fixed but here is what I did. I installed a counter of active PHP sessions on my site, in order to measure the popularity of my site. This counter raised up to only about 150, which is not much according to me. At first, this script was call every minutes for each sessions, which was really too much. I changed this to every 5 minutes after the second suspension.
I'm willing to remove it completely, I'll do this right now. But I'm not sure this is the problem, do we have logs or something for helping us determing the culprit script ?

Thanks for your help and unsuspending my pages.

Regards, Big Horn

Suspension reference : SPND_RUSAGE3

[galaxyAbstractor]

I have escalated this so that an admin could tell what's causing it