Organization: Thought Unlimited. Public service Unix since 1986.
Of_Interest: With 27 years of service to the Unix community.
On Sun, Sep 15, 2013 at 07:56:17AM +0100, Matthew Seaman wrote:
> On 15/09/2013 07:20, Gary Kline wrote:
>
> > I've evidently had too many pain meds; this shelll script should
> > be easy. say that I have a utility xxx running sometimes. xxx is
> > soaking up a chunk of my load. I have to use top to find if
> > xxx is running, then kill -9 to kill xxx and have a steady load of,
> > say, between 0.10 and 0.15. what's the script that can do this?
>
> The classic answer to this is that you need to find the pid of your
> 'xxx' process, and then kill it using that. Some combination of ps(1)
> and grep(1) usually sufficed.
>
> However nowadays there's the very handy pkill(1):
>
> pkill -9 xxx
>
> Tying that in with the trigger based on system load:
>
> #!/bin/sh
>
> load=$(sysctl vm.loadavg | cut -d ' ' -f 3)
> too_high=$(bc -e "$load > 0.15" < /dev/null)
>
> if [ $too_high = '1' ]; then
> pkill -9 xxx
> fi
>
> Note the use of bc(1) to compare floating point values -- the built-in
> $((shell arithmetic)) or expr(1) only do integer arithmetic.
>
> One final point -- instead of killing the xxx process when the load gets
> too high, you could simply renice(1) it to very low priority. Or even
> better, use idprio(1).
>
> This won't actually affect the system load values much as 'system load'
> is an average of the number of processes requesting a CPU time slice.
> What it does do is mean that your 'xxx' process is always pretty much
> the last process to get any CPU time -- so everything else should remain
> responsive, and your xxx process will only run when the system is
> otherwise idle.
>
> Cheers,
>
> Matthew
thanks very much, gents. no, it wasnt my med; it was that I slept
ttoo much:: Old age. "pkill -9 utility" works. the 0.15 or 0.10
were arbitrrary. the default load adverage should be even less
since the box is just sitting here! ...well, it's replying to
lookup, I suppose. tx again,
gary
> --
> Dr Matthew J Seaman MA, D.Phil.
>
> PGP: http://www.infracaninophile.co.uk/pgpkey
> JID: matt...@infracaninophile.co.uk
>
--
Gary Kline kl...@thought.org http://www.thought.org Public Service Unix
Twenty-seven years of service to the Unix community.
http://www.thought.org/HOPE
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