drbrain - 5:50 pm on Aug 13, 2004 (gmt 0)

See also the tuning man page (your system should have one). Depending on platform you'll have utilities like:

systat, pstat, iostat, vmstat, and netstat.

top and vmstat are typically used to monitor CPU usage.

See your system's manpages for more information.

100% CPU usage on 50 concurrent request threads seems about right, that's 50 independent users accessing pages as fast as they can.