getting unix stats for a specific process

Hi,
We are trying to run reports to determine what percentage of the physical cpu's are being used by Informix ( oninit ) processes on an Aix5.3 box.

Is there any way to do that ? Sar just captures percentages but not by process name
Topas allows us to see some of the processes, but even those it can't store long term in a file( at least I don't know how to do that ).

Any advice would be appreciated.

Thanks,
floyd

Search google for "nmon" and see if that fits your needs. It's for IBM systems.