I've eAccelerator placed on an apache web server for PHP.
Basically consider the phpinfo() output, I can tell that files are cached.
I question to myself,
If they're cached, why after i make changes towards the PHP files it
works immediately without requiring to purge the cache?

Does eAccelerator look into the timestamp from the files? and when so,
it is possible to method to disable it and by hand flush the cache to improve performace?
(by rescheduling the timestamp checking)

eAccelerator inspections the timestamp of files to determine if it must recompile it according to what it really has in cache. By hand controlling this method seems like it might really slow things lower.