All, I have built NWChem successfully, and trying to run it with an Intel built version of OpenMPI 1.4.1. If I force to run over over 1 GigE maintenance interconnect it works, but when I try it over the default InfiniBand communications network it fails with:
-------------------------------------------------------------------------- An MPI process has executed an operation involving a call to the "fork()" system call to create a child process. Open MPI is currently operating in a condition that could result in memory corruption or other system errors; your MPI job may hang, crash, or produce silent data corruption. The use of fork() (or system() or other calls that create child processes) is strongly discouraged. The process that invoked fork was: Local host: gpute-2 (PID 15996) MPI_COMM_WORLD rank: 0 If you are *absolutely sure* that your application will successfully and correctly survive a call to fork(), you may disable this warning by setting the mpi_warn_on_fork MCA parameter to 0. -------------------------------------------------------------------------- This looks to be a known problem. Is there I go around? I have seen it suggested in some places that I need to use Mellanox's version of MPI, which is not an option and surprises me as they are a big OFED contributor. What are my options ... other than using GigE ... ?? Thanks, rbw Richard Walsh Parallel Applications and Systems Manager CUNY HPC Center, Staten Island, NY 718-982-3319 612-382-4620 Mighty the Wizard Who found me at sunrise Sleeping, and woke me And learn'd me Magic! Think green before you print this email.
