[Users] Benchmarking results for McLachlan rewrite

[Erik Schnetter]

On Sat, Jul 4, 2015 at 10:21 AM, Ian Hinder <ian.hinder at aei.mpg.de> wrote:

>
> On 3 Jul 2015, at 22:38, Erik Schnetter <schnetter at cct.lsu.edu> wrote:
>
> I ran the Simfactory benchmark for ML_BSSN on both the current version and
> the "rewrite" branch to see whether this branch is ready for production
> use. I ran this benchmark on a single node of Shelob at LSU. In both cases,
> using 2 OpenMP threads and 8 MPI processes per node was fastest, so I am
> reporting these results below. Since I was interested in the performance of
> McLachlan, this is a unigrid vacuum benchmark using fourth order
> differencing.
>
> One noteworthy difference is that dissipation as implemented in the
> "rewrite" branch is finally approximately as fast as thorn Dissipation, and
> I have thus used this option for the "rewrite" branch.
>
> Here are the high-level results:
>
> current: 3.03136e-06 sec per grid point
> rewrite: 2.85734e-06 sec per grid point
>
> That is, the rewrite branch is about 5% faster.
>
>
> Hi Erik,
>
> That is very reassuring!  However, for production use, I would be more
> interested in 6th or 8th order finite differencing (where the advection
> stencils become very large), and with Jacobians.  If 8th order with
> Jacobians is at least a similar speed with the rewrite branch, then I would
> be happy with switching.
>

Ian

Do you want to suggest a particular benchmark parameter file?

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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