[petsc-users] Performance of ISCreateGeneral()

[Mark Adams]

ISCreateGeneral just takes your indices and caches them. But it is a synch
point. What ratio (max/min) is PETSc reporting in this data?

On Sun, Jul 5, 2020 at 1:51 PM Y. Shidi <ys453 at cam.ac.uk> wrote:

> Dear developers,
>
> I am currently doing a weak scaling test, and find that
> the weak scaling results for ISCreateGeneral() is very bad.
> For 2, 4, 8 processors, the running times for completing
> ISCreateGeneral() are:
> 0.687494, 3.00597 and 10.0613.
> I am not sure if this is normal.
>
> Thank you for your time.
>
> Kind Regards,
> Shidi
>
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