LAMP Diagnostics

I have a single dynamic (php) site on an Athlon XP 2400 with 512 MB RAM. In times of "high load" - which is only about 20 users - something happens and users start timeing out or are unable to connect.

I've watched CPU load during these times, and it might get up to 0.12 or 0.15.

RAM seems to hover between 90% and 98%, but rarely spills over into swap. (swap usage is only 800k).

MySQL is set to log slow queries, and "slow" is anything over 2 sec - but nothing ever shows up there.

I'm trying to figure out where the problem is. It doesn't look like CPU, and while the RAM usage doesn't look good to me, it's not swapping. How do I figure this out?

 

 

 

 

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