On Sun, 03 May 1998, Troels Arvin wrote:
>When the rc5des software is not running, the following procedure
>takes around one minute:
>time cat /dev/hda1 >/dev/null
>(CPU usage is around 30%)
>
>When the rc5des software is running, the same procedure takes
>15 minutes ('time' reports CPU usage as 0%)
Strange. However, 'nice' by itself doesn't guarantee that the nice'd
process will always run at the lowest priority -- it only guarantees
that the process will run at a relatively lower priority than other
processes on the system.
If you want to specifically tell the system to run your process only
when not doing anything else, then use 'nice -19' rather than 'nice'.
You can change the priority of the process by 'renice <PID>'; I suggest
you renice it to -19 and then rerun your tests.
--
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