On Thu, Nov 02, 2006 at 10:37:24AM -0800, Brian Budge wrote: > Hi all - > > I'm wondering how DMA is handled in OpenMPI when using the infiniband > protocol. In particular, will I get a speed gain if my read/write buffers > are already pinned via mlock? > No you will not. mlock has nothing to do with memory registration that is needed for RDMA. If you'll allocate your read/write buffers with MPI_Alloc_mem() that will help because this function register memory for you.
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Gleb.
