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SubjectRe: can I bring Linux down by running "renice -20 cpu_intensive_process"?
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On Fri, 2006-03-10 at 22:01 +0000, Måns Rullgård wrote:
> Jan Engelhardt <jengelh@linux01.gwdg.de> writes:
>
> >>Subject: can I bring Linux down by running "renice -20
> >>cpu_intensive_process"?
> >>
> > Depends on what the cpu_intensive_process does. If it tries to allocate
> > lots of memory, maybe. If it's _just_ CPU (as in `perl -e '1 while 1'`),
> > you get a chance that you can input some commands on a terminal to kill it.
> > SCHED_FIFO'ing or SCHED_RR'ing such a process is sudden death of course.
>
> Sysrq+n changes all realtime tasks to normal priority.
>

A nice -20 SCHED_OTHER task is not realtime, only SCHED_FIFO and
SCHED_RR.

Lee

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