[petsc-users] O3 versus O2

Alfredo Jaramillo ajaramillopalma at gmail.com
Wed Mar 8 22:52:41 CST 2023

Dear community,

We are in the middle of testing a simulator where the main computational
bottleneck is solving a linear problem. We do this by calling
GMRES+BoomerAMG through PETSc.

This is a commercial code, pretended to serve clients with workstations or
with access to clusters.

Would you recommend O3 versus O2 optimizations? Maybe just to compile the
linear algebra libraries?

Some years ago, I worked on another project where going back to O2 solved a
weird runtime error that I was never able to solve. This triggers my

Thank you for your time!
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