[petsc-users] Reductions in various vector and matrix kernels
Jed Brown
jedbrown at mcs.anl.gov
Tue Jan 7 19:32:31 CST 2014
"R. Oğuz Selvitopi" <roguzsel at gmail.com> writes:
> It seems PETSc performs additional checks that require extra communication
> in VecAXPY/VecAYPX as well as in MatMultTranspose when built with debug
> option.
That's why it's called "debug". The checks are to make sure that
logically collective information is indeed collective. The man pages
state "logically collective" and debug builds verify most things.
> It does not perform any communication in the kernels I have mentioned in
> the optimized build.
Correct.
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