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Published 20 hours ago • verified publisher icon quinoacomputing

Explore build without MPI

Open jbakosi opened this issue 9 years ago • 1 comments

jbakosi avatar Jul 02 '15 20:07 jbakosi

There are multiple aspects/variations of this:

  • [x] Using MPI third-party libraries possibly without MPI (e.g., OpenMPI, etc.) but with Charm++'s AMPI. Not sure if this is possible but, after consulting with Charm++ developers, there appears no real problem with it in theory. See also https://lists.cs.illinois.edu/lists/arc/charm/2016-03/msg00049.html. (Update: we can now build all TPLs on top of AMPI.)

  • [ ] Another interesting way to use "MPI without MPI" is to rely on AMPI as in the first bullet above, and use AMPI's over-decomposition and thread migration to improve the performance of the MPI-only libraries. Hypre should be a good candidate to try this as that is known to run fine on top of AMPI without any performance hit.

  • [ ] There may also be a way to not have to build Charm++ on top of MPI and still be able to use MPI-only libraries. This should work on BG/Q and Cray.

  • [x] Not using the MPI wrappers for the build, but let cmake pick up whatever it finds as default system-wide. This already works fine, see d4add0a.

jbakosi avatar Apr 23 '16 18:04 jbakosi