On Jan 30, 2009, at 23:57 , Greg Lindahl wrote:
Well, like any experiment in this space, this isn't quite head-to-head. It could easily be the case that Platform MPI has some better collectives or other implemtation details which provide a performance boost outside of the RDMA vs. message passing issue. I thought you had a PSM implementation of Platform MPI?
Yes, we do.
In which case, perhaps you could compare it against the QLogic MPI on the same hardware, to see what these other effects might be.
I agree. We would love to do a real head-to-head. The use of Collective operations is not the answer though, but I don't have the split between pnt2pnt and collectives for the 13 apps on the top of my head. I should get back to the list with a correlation of the performance advantage of PMPI vs. use of collectives.
It would also be interesting to compare Platform MPI against MVAPICH on the same hardware -- do you have those numbers?
Well, no-one submits with MVAPICH. From the SPEC MPI2007 web site, you will find PMPI performing better that Intel MPI, HP-MPI, MPT (SGI MPI) using ConnectX.
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