anyway to know the server load of sites/file

i have a dedicated server, occasioanly, server load shoots to 100% and i dont' know why.

so , is there a way by which i can see which site/file is using entire processing, and bandwidth?

something like a task manager for windows.

my server is centos 5 with direct admin installed.

direct admin has a function by which i can see which service is using the processing, but it does not help in see which particular file or site is using that much resources.

server is with 2.4x 4 core xeon processor, 4 GB Ram with only a few wordpress installed.

any graphical gui would be great.

in other words, as a webhost, how can you detect how much resources are being used by a user and his particular file. ( to give you a clearer idea)

 

htop is your best friend, try it

 

htop is good but it won't give you history.... try hotsanic.

 

check the wordpress theme and remove unwanted plugins. Those may take more cpu.
there is also a php script to check for cpu load. i have seen somewhere in http://best-php-scripts.com