[petsc-users] MPI bindings for PETSc local and global numbering

[Jed Brown]

Justin Chang <jychang48 at gmail.com> writes:
> ${MPIEXEC}.hydra -n <procs> -bind-to hwthread -map-by socket ./myprogram
> <args>

Why are you using "-map-by socket" if you want a sequential ordering?

Abstractly, I expect a tradeoff between load balancing in case of
correlated irregularity and cache locality, but would tend to prefer
sequential ordering (so that nearby row numbers are more likely to share
cache).
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