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Subject: [OMPI devel] GPUDirect v1 issues
From: Sebastian Rinke (s.rinke_at_[hidden])
Date: 2012-01-17 08:50:21


Dear all,

I'm using GPUDirect v1 with Open MPI 1.4.3 and experience blocking MPI_SEND/RECV to block forever.

For two subsequent MPI_RECV, it hangs if the recv buffer pointer of the second recv points to somewhere, i.e. not at the beginning,
in the recv buffer (previously allocated with cudaMallocHost()).

I tried the same with MVAPICH2 and did not see the problem.

Does anybody know about issues with GPUDirect v1 using Open MPI?

Thanks for your help,
Sebastian