Skip to Main Content U.S. Department of Energy
PNNL: High Performance Computing

Global Arrays and ComEx Platform-Specific Notes

The purpose of this page is to provide updated information on the operating system configurations/settings that are relevant for the Global Arrays and ComEx users on different platforms.

If you have questions or need support/help/report-bug, contact the GA/ComEx developers at or visit our Google Group to see the collection of prior postings to the list.


MPI - Progress Ranks

    The progress ranks port uses MPI (requires MPI1). It can be used using --with-mpi-pr compile time option. Your application code must not rely on MPI_COMM_WORLD directly. Instead, you must duplicate the MPI communicator that the GA library returns to you in place of any world communicator. Example code follows:


          program main
          implicit none
    #include “mpi.fh"
    #include "global.fh"
    #include "ga-mpi.fh"
          integer comm
          integer ierr
          call mpi_init(ierr)
          call ga_initialize()
          call ga_mpi_comm(comm)
    ! use the returned comm as ususal
          call ga_terminate()
          call mpi_finalize(ierr)


    #include "ga.h"
    #include "ga-mpi.h"
    int main(int argc, char **argv) {
        MPI_Comm comm;
        comm = GA_MPI_Comm();
        return 0;

MPI - Progress Threads

MPI - Multithreading


  • GA/ComEx is not supported on QLogic hardware as QLogic's OFED interfaces don't work well with GA/ComEx.
  • GA versions >= 4.1 supports OpenIB. It has been tested with OFED Please send a message to with your system configuration details if you face any problems running on OFED or later versions.
  • Here is a sample set of ENV settings on a 64-bit Linux cluster to build GA.

    export TARGET=LINUX64

    # MPI Settings - Using MVAPICH here.
    export MPI_HOME=/usr/mpi/gcc/mvapich-0.9.9
    export MPI_LIB=$MPI_HOME/lib
    export MPI_INCLUDE=$MPI_HOME/include
    export LIBMPI="-lmpich"

    # IB Settings (path to "ofed")
    export IB_HOME=/opt/ofed
    export IB_INCLUDE=$IB_HOME/include
    export IB_LIB=$IB_HOME/lib64
    export IB_LIB_NAME="-libverbs -libumad -lpthread -lrt"

Site Links

Our Research

Past Research

Global Arrays Links

News and Events