[Beowulf] Using Autoparallel compilers or Multi-Threaded libraries with MPI

Mark Hahn hahn at mcmaster.ca
Thu Nov 29 22:02:58 PST 2007

> provide some thread-level parallelism on a cluster where you primarily
> use MPI to achieve your parallel execution.*

either threads for low-investment newbie parallelism
or MPI for serious scalability.

> Have you used compiler auto-parallel features mixed with MPI with
> success on your clusters?

only for running HPL (where, iirc, it wasn't a win).  it makes sense 
that if you've taken the trouble to use MPI, you probably have more 
concurrency available than just threaded blas/lapack calls.

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