Package edu.jas.kern

Class MPJEngine

  • public final class MPJEngine
extends java.lang.Object
    MPI engine, provides global MPI service. Note: could eventually be done directly with MPI, but provides logging. Usage: To obtain a reference to the MPI service communicator use MPJEngine.getComminicator(). Once an engine has been created it must be shutdown to exit JAS with MPJEngine.terminate().
    Author:
    Heinz Kredel

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected static java.lang.String[] cmdline
      Command line arguments.
      static java.util.ArrayList<java.lang.String> hostNames
      Hostnames of MPI partners.
      static java.lang.String hostSuf
      Hostname suffix.
      (package private) static mpi.Intracomm mpiComm
      MPI communicator engine.
      static int N_CPUS
      Number of processors.
      static int N_THREADS  
      static boolean NO_MPI
      Flag for MPI usage.
      static int TAG
      MPI engine base tag number.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static mpi.Comm getCommunicator()
      Get the MPI communicator.
      static mpi.Comm getCommunicator​(java.lang.String[] args)
      Get the MPI communicator.
      static boolean isRunning()
      Test if a pool is running.
      static void setCommandLine​(java.lang.String[] args)
      Set the commandline.
      static void setMPI()
      Set MPI usage.
      static void setNoMPI()
      Set no MPI usage.
      static void terminate()
      Stop execution.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • cmdline

        protected static java.lang.String[] cmdline
        Command line arguments. Required for MPI runtime system.

      • hostNames

        public static java.util.ArrayList<java.lang.String> hostNames
        Hostnames of MPI partners.

      • NO_MPI

        public static boolean NO_MPI
        Flag for MPI usage. Note: Only introduced because Google app engine does not support MPI.

      • N_CPUS

        public static final int N_CPUS
        Number of processors.

      • N_THREADS

        public static final int N_THREADS

      • mpiComm

        static mpi.Intracomm mpiComm
        MPI communicator engine.

    • Method Detail

      • setCommandLine

        public static void setCommandLine​(java.lang.String[] args)
        Set the commandline.
        Parameters:
        args - the command line to use for the MPI runtime system.

      • isRunning

        public static boolean isRunning()
        Test if a pool is running.
        Returns:
        true if a thread pool has been started or is running, else false.

      • getCommunicator

        public static mpi.Comm getCommunicator()
                                throws java.io.IOException
        Get the MPI communicator.
        Returns:
        a Communicator constructed for cmdline.
        Throws:
        java.io.IOException

      • getCommunicator

        public static mpi.Comm getCommunicator​(java.lang.String[] args)
                                throws java.io.IOException
        Get the MPI communicator.
        Parameters:
        args - the command line to use for the MPI runtime system.
        Returns:
        a Communicator.
        Throws:
        java.io.IOException

      • terminate

        public static void terminate()
        Stop execution.

      • setNoMPI

        public static void setNoMPI()
        Set no MPI usage.

      • setMPI

        public static void setMPI()
        Set MPI usage.