[Patch] Linpack-pc broken as a performance benchmark

[Yaron Keren]

The usual method of dealing with ever-changing computing power is to have
the benchmark run for a fixed time and measure how many iterations were
performed during that time.

Yaron



2013/10/30 Hal Finkel <hfinkel at anl.gov>

> ----- Original Message -----
> >
> > On Oct 30, 2013, at 4:13 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> >
> > > ----- Original Message -----
> > >> Hi all,
> > >>
> > >> SingleSource/Benchmark/Linpack is broken as a performance
> > >> benchmark.
> > >> It uses the time to execute a set of functions to determine the
> > >> time
> > >> to run another set of functions.
> > >>
> > >> The attached patch fixes this by setting “ntimes” to arbitrary
> > >> 10000.
> > >> The benchmark then runs in about 30 secs on a recent mac.
> > >
> > > 30 seconds sounds good to me. However, some of the embedded folks
> > > may complain ;) -- We should probably have it depend on whether
> > > SMALL_PROBLEM_SIZE is in effect or not. (You can add a
> > > preprocessor define in the makefile when SMALL_PROBLEM_SIZE is
> > > defined, and let that set it to be a factor of 10 smaller).
> >
> > Sure,
> >
> > most benchmarks I have seen seem to simply put a “#ifdef
> > SMALL_PROBLEM_SIZE” in the c source it self. So I did that.
>
> Great, LGTM.
>
> Thanks,
> Hal
>
> >
> >
>
> --
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
>
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