How To Tell if a Program is cached

[Reuben D. Budiardja]

Hello,
I'm having a problem with my webmail server being slow after some time. I've 
tried restarting httpd, and it didn't really help. Restarting xinetd (since 
imapd is run by xinetd) *seems* to work though (need to test more). I am 
wondering if this is because somehow imapd was cached / put to swap.

Hence my question. Is there anyway to tell if an application or program is in 
swap or in memory ?

Thanks.
Reuben  D. Budiardja