Thanks,
george.On Apr 17, 2007, at 4:30 PM, Michael wrote:
To maintain compatibility with a major HPC center I upgraded(?) from OpenMPI 1.1.4 to OpenMPI 1.2 on my local cluster. In testing on my local cluster, 13 dual-Opteron Linux boxes with dual gigabit ethernet, I discovered that my program runs slower using OpenMPI 1.2 then OpenMPI 1.1.4 (780.3 versus 402.4 seconds with 3 processes--tested twice to be certain). This particular version of my program was designed to minimize the amount of communications and the only MPI calls that get used a lot are MPI_SEND and MPI_RECV with MPI_PACKED data (so MPI_PACK and MPI_UNPACK also get used a lot). Was there a known problem with OpenMPI 1.2 (r14027) and ethernet communication that got fixed later? The same executable run at the major center seems fine, but they have Myrinet. Michael _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users
smime.p7s
Description: S/MIME cryptographic signature
