[petsc-users] Amortizing calls to PetscOptionsFindPair_Private()

Griffith, Boyce Eugene boyceg at email.unc.edu
Sat Jan 16 07:12:03 CST 2016

On Jan 16, 2016, at 12:34 AM, Bhalla, Amneet Pal S <amneetb at live.unc.edu<mailto:amneetb at live.unc.edu>> wrote:

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%).

Barry / Matt / Jed, if we were using KSPReset here and reusing KSPs, would that also bypass these calls to PetscOptionsXXX?


-- Boyce
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