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Cyclops Tensor Framework: parallel arithmetic on multidimensional arrays
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Required MPI3 support #14

Closed devinamatthews closed 8 years ago

devinamatthews commented 8 years ago

Currently OpenMPI 1.6.5 (and possible other pre-MPI3 libs) can't compile CTF. We should clarify:

  1. If MPI3 support is required (or what MPI3 features are required)?
  2. What minimum version of OpenMPI/MPICH etc. is required?

(Note that OpenMPI 1.6.5 did work until recently, so perhaps full MPI3 support isn't necessarily required?)

jeffhammond commented 8 years ago

We can rely upon MPI_VERSION and MPI_SUBVERSION, although this is not always reliable, both because implementers don't wait until they have all of MPI x.y before setting those symbols to x and y, respectively, and because implemented features don't always work correctly.

The other option is to switch to a real Autotools build system and have configure tests for the exact set of MPI features we use.

solomonik commented 8 years ago

I think currently all CTF MPI usage is quite basic (no one sided communication or asynchronous collectives at the moment), so MPI 3 support is not required, but I don't know exactly what version is required. If you can confirm that OpenMPI works now that we switched the datatype nomenology I will close this.