find botleneck 4 Apache-Jrockit-sybase

OS = Redhat Linux
Web App Server = Apache-1.3.22, Resin-2.0.4, jrockit-1.3.1, Sybase SQL Anywhere
server = 1GB, PIII-900Mhz with RAID mirror
Sysbase db = 74MB
web users = 15 to 30 max internationaly

Im getting servere slow down & can’t locate where the problem is. Java is using 115MB each session, Sybase is using 56MB per session both are pooled sessions. CPU utilisation max @ 94% free.

I need to find some way of analysing what is causing the bottleneck. what free or under ?200 programs can analyse apache, Jrockit & sybase & locate the cause?

Also for less TechPoints: Are there any free websites that have good refernce info in these areas ?