[petsc-users] Amortizing calls to PetscOptionsFindPair_Private()

Bhalla, Amneet Pal S amneetb at live.unc.edu
Fri Jan 15 23:34:22 CST 2016

On Jan 15, 2016, at 5:40 PM, Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>> wrote:

I am inclined to try
Barry's experiment first, since this may have bugs that we have not yet discovered.

Ok, I tried Barry’s suggestion. The runtime for PetscOptionsFindPair_Private() fell from 14% to mere 1.6%.
If I am getting it right, it’s the petsc options in the KSPSolve() that is sucking up nontrivial amount of time (14 - 1.6)
and not KSPSetFromOptions() itself (1.6%).

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