Openmpi perform Java MPI job __java

Openmpi perform Java MPI jobs

Next blog (set up open MPI cluster environment) Install java environment

sudo yum install-y java-1.8.0-openjdk.x86_64 java-1.8.0-openjdk-devel.x86_64

Compile and install Openmpi

$./configure--prefix=/opt/openmpi--enable-mpi-java
$ make
$ sudo make install

* Note: To use the "–enable-mpi-java" option * Install validation

After the installation is complete, check that the/opt/openmpi/bin/mpijavac file exists and that the installation is successful if the file exists. performing Java MPI jobs Hello.java File

Import java.net.InetAddress;
Import mpi.*;

Class Hello {
    static public void main (string[] args) throws Exception {

    MPI. Init (args);
    String hostname = Inetaddress.getlocalhost (). GetHostName ();
    int myrank = MPI.COMM_WORLD.getRank ();
    int size = MPI.COMM_WORLD.getSize ();
    System.out.println ("<" + hostname + "": "+" Hello World from Rank "+ Myrank +" of "+ size);

    Mpi. Finalize ();
    }

Hosts file

Test1    slots=2
test2    slots=2

compiling Java code

$ Mpijavac Hello.java

running Java Classes

$ mpiexec--hostfile hosts-np 4 java Hello
<test1>: Hello World from rank 0 of 4
<test1>: Hello wor LD from rank 1 of 4
<test2>: Hello World from rank 2 of 4
<test2>: Hello World from rank 3 of 4

Reprint please link the form to indicate this article link
This article link: http://blog.csdn.net/kongxx/article/details/52237416