On Tue, 2009-11-24 at 15:55 +0530, Vivek Satpute wrote: > Hi, > > I am new to Open MPI ( which is part of OFED-1.4 packege ). I have few > basic queries about > Open MPI : > > 1) I am using openmpi-1.2.8 ( it is part of OFED-1.4 ). Is has two > examples i) hello_c ii) ring_c > Does those examples work on Multiple machines or meant for a > single node (i.e. localhost) ?
MPI programs are designed to work across multiple machines. That's largely the point of MPI. They also work well as multiple processes on a multiple-CPU machine, or combinations of the two. > 2) Does MPI_Send() and MPI_Recv() calls send message from process on > one machine to > process on another machine ? If yes, then how can I achieve this ? Take a look at what the example codes are doing. Read man mpirun. Wait for someone here to point you to an MPI primer or tute. > 3) Does MPI APIs are implemented on the top of Infiniband ? Does MPI > APIs uses Infiniband > hardware and its module for sending and receiving data ? If you've working infiniband, and your MPI implementation (eg. OpenMPI) is configured to use it, then yes. As your MPI is part of OFED, this is eminently likely.
