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--- howto:java [2015/10/23 14:49]
dane created
+++ howto:java [2021/12/09 16:42] (current)
@@ Line 1: / Line 1: @@
-Java blah blah
+====== Using Java ======
+=====Example Java Script=====
+<file java Hello.java>
+/*
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+ */
+/*
+ * Copyright (c) 2011      Cisco Systems, Inc.  All rights reserved.
+ *
+ */
+import mpi.*;
+import java.net.InetAddress;
+class Hello {
+    static public void main(String[] args) throws MPIException {
+        MPI.Init(args);
+        int myrank = MPI.COMM_WORLD.getRank();
+        int size = MPI.COMM_WORLD.getSize() ;
+        InetAddress IP;
+        try {
+            IP = InetAddress.getLocalHost().getLocalHost();
+            System.out.println("Hello world from rank " + myrank + " of " + size+" I'm running on "+IP.getLocalHost());
+        }
+            catch (Exception e) {
+        }
+        MPI.Finalize();
+    }
+}
+</file>
+<code bash>
+$ module add chpc/openmpi/1.10.3/gcc-5.1.0_java-1.8.0_73
+$ mpijavac Hello.java
+</code>
+<file bash java_test.qsub>
+#!/bin/bash
+#PBS -l select=2:ncpus=24:mpiprocs=24
+#PBS -l walltime=00:01:00
+#PBS -q normal
+#PBS -P SHORTNAME
+#PBS -M YOUREMAILADDRESS
+#PBS -m be
+#PBS -e /mnt/lustre/users/USERNAME/java_test/std_err.txt
+#PBS -o /mnt/lustre/users/USERNAME/java_test/std_out.txt
+#PBS -N JAVA_TEST
+module add chpc/openmpi/1.10.3/gcc-5.1.0_java-1.8.0_73
+NP=`cat ${PBS_NODEFILE} | wc -l`
+cd /mnt/lustre/users/USERNAME/java_test
+mpirun -np ${NP} -machinefile ${PBS_NODEFILE} java Hello
+</file>
+<code bash>
+$ qsub java_test.qsub
+</code>
+**Notes:**
+  * Replace ''USERNAME'' with **your** user name.
+  * Replace ''YOUREMAILADDRESS'' with **your** email address.

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