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(I now think the ep_fabric specification was redundant.)  A fair bit of development has occurred on the tcp provider since the libfabric release that we use (1.10.1) appeared.  I need to further investigate the differences between tcp and sockets to understand the cause of the problem.

Running eblf_pingpong

We have some evidence that running this can fix the problem with teb to drp DrpEbReceiver process (the "383" or "384" event problem) but maybe have to run eblf_pingpong in the "right direction" ("-S" maybe has to be on the broken node?).

Run this on two different nodes:

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