checking bandwidth usage / load average

I see my load average go up to 2.00 or 3.00. I wanted to know how can I find out specifically what is using the most reasources right then. In shell the command "top" shows the above info but how do I trace a certain PID to a certain account or user?

Also, many times the high process is "exim" and it dosen't make sense it's emailing that much, where can I look to see what accounts is "exim" executing for.

And in general, where can I see (in WHM or shell) a detailed log of bandwidth used for a certain user, including his email, http, ftp etc... (mainly email I guess).


Thanks much

P.S. some users have complained that their bandwidth jumped to 100MB or even 1000MB in, like, 1 day and that it's impossible cuz they never used that much, where can I investigate that (i.e. what is using that bandwidth)?

 

 

 

 

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