edu.jas.kern

Class MPIEngine

java.lang.Object

edu.jas.kern.MPIEngine

public final class MPIEngine
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 MPIEngine.getComminicator(). Once an engine has been created it must be shutdown to exit JAS with MPIEngine.terminate().

Author:

Heinz Kredel

Field Summary

Fields

Modifier and Type	Field and 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

Modifier and Type	Method and 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.

TAG

public static final int TAG

MPI engine base tag number.

See Also:

Constant Field Values

hostSuf

public static final java.lang.String hostSuf

Hostname suffix.

See Also:

Constant Field Values

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,
                                       mpi.MPIException

Get the MPI communicator.

Returns:

a Communicator constructed for cmdline.

Throws:

java.io.IOException

mpi.MPIException

getCommunicator

public static mpi.Comm getCommunicator(java.lang.String[] args)
                                throws java.io.IOException,
                                       mpi.MPIException

Get the MPI communicator.

Parameters:

args - the command line to use for the MPI runtime system.

Returns:

a Communicator.

Throws:

java.io.IOException

mpi.MPIException

terminate

public static void terminate()

Stop execution.

setNoMPI

public static void setNoMPI()

Set no MPI usage.

setMPI

public static void setMPI()

Set MPI usage.