High CPU Load Average

[egglan]

I'm trying to figure out what website is taking up my CPU load on my VPS. htop is showing user www-data is maxed out to 100 / apache2, but how do I figure out what user in www-data is using all my resources?

I'm using Debian 7 x64.

[rasdotsu]

need trace that process and look what it want from cpu too much :)

truss / strace helps.