[petsc-dev] MatTransposeMatMult

[Jed Brown]

I have a simple SeqAIJ example where MatTransposeMatMult is 30x slower
than MatTranspose followed by MatMatMult.  This is embarrassing when
people try to compare performance.  Are there any cases where these
custom implementations provide value rather than just confusing people
or turning them away from PETSc?
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