Hi John,
Thanks for the response.
> I'm using KrylovSchur eigensolver
>> in SLEPc and I find that the eigenvalue computation anti-scales when I use
>>
>
> anti-scales?
>
Yes, I get the following scaling
Processes Eigensolver time(s)
1 68.3037
2 51.9604
4 49.5286
8 66.7834
16 106.671
32 128.522
One node contains 16 processors, so the last time is for 2 nodes.
> Gauss quadrature. Having a diagonal pattern in B might fix the scaling and
>> increase the performance.
>>
>> Do you have any other suggestions on improving the scaling?
>>
>
> Use preconditioners which scale well, like AMG, if they make sense for
> your problem.
>
I can try using different preconditioners. How do I set the preconditioner
for the eigensolver?
Thanks,
Harshad
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