The TIME CPU column is the total CPU time accumulated by the process. You have to be careful what you mean by "75% of the CPU", because you need to quantify that by saying "over how long of a period". I'm assuming you're going to use some number of seconds or minutes. Thus you would calculate the CPU usage for that period by subtracting the total times for any process that's still running between the two times that you looked, then get the percentage by dividing over the time period you're using.

Notice this implies your CPU hogs are also long-running. In other words, a CPU-intensive process that goes away in a less than a minute may not register, though your users may still complain about a momentary lack of response.

Yes, this isn't precise, but it's good enough for government work. ;-)

Update
Mislabelled the column name.

In reply to Re (3): Using Perl to find Process Hogs by VSarkiss
in thread Using Perl to find Process Hogs by Octavian

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