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
