[petsc-users] Prometheus vs GAMG for elasticity/plasticity problems

[Jed Brown]

Mark Adams <mfadams at lbl.gov> writes:

>> We're seeing a bit lower performance in MatMult with GAMG, perhaps
>> because we are not using block formats specialized for elasticity.
>>
>>
> The block info seems to be there.

I meant that GAMG isn't using BAIJ, but Prometheus is.  That affects
kernel efficiency.

> SOR is two iterations is twice as expensive and twice as powerful, roughly.

It should be less than twice as expensive because the zero initial guess
case is optimized.  If we also optimize triangular reuse in the
subsequent residual evaluation, it should be about the same cost.
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