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SubjectRe: [PATCH] x86: Run checksumming in parallel accross multiple alu's
On Tue, Oct 29, 2013 at 12:30:31PM +0100, Ingo Molnar wrote:
>
> * Neil Horman <nhorman@tuxdriver.com> wrote:
>
> > Sure it was this:
> > for i in `seq 0 1 3`
> > do
> > echo $i > /sys/module/csum_test/parameters/module_test_mode
> > taskset -c 0 perf stat --repeat 20 -C 0 -ddd perf bench sched messaging -- /root/test.sh
> > done >> counters.txt 2>&1
> >
> > where test.sh is:
> > #!/bin/sh
> > echo 1 > /sys/module/csum_test/parameters/test_fire
>
> What does '-- /root/test.sh' do?
>
> Unless I'm missing something, the line above will run:
>
> perf bench sched messaging -- /root/test.sh
>
> which should be equivalent to:
>
> perf bench sched messaging
>
> i.e. /root/test.sh won't be run.
>
According to the perf man page, I'm supposed to be able to use -- to separate
perf command line parameters from the command I want to run. And it definately
executed test.sh, I added an echo to stdout in there as a test run and observed
them get captured in counters.txt

Neil

> Thanks,
>
> Ingo
>


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