real-time versus non-real-time

[Jeffrey Krasky]

Hi, is there a way in Linux to run a process and determine which other processes might have been going on during the execution of your process?  I would like to run my task in real-time and see how long it takes to run, and then run it in ordinary linux mode and see how long it takes to run.  Then I want to note the differences, but I would like to also be able to see, when running in ordinary linux mode, if anything else used any of the same CPUs as my task did.     Thanks,     Jeff