Using CnC on MPI

Using CnC on MPI

We discovered a few issues with using CnC on MPI. Most of them will be fixedwith the upcoming release of Intel MPI 4.1. If you encounter problems with earlier versions of Inte MPIhereare simple work-arounds which should make things work fine:

On TCP/Scokets
-at runtime, set environment variable
I_MPI_DYNAMIC_CONNECTION=0
On Infiniband/DAPL
- at runtime, set envrionment variables
I_MPI_DAPL_CREATE_CONN_QUAL=0
I_MPI_DAPL_TRANSLATION_CACHE=off
- when using debug libs (e.g. cnc_debug) additionally set environment variable
I_MPI_WAIT_MODE=0

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