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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