Add the X10 language (http://x10-lang.org/).

samples/X10/HeatTransfer_v0.x10

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+/*
+ *  This file is part of the X10 project (http://x10-lang.org).
+ *
+ *  This file is licensed to You under the Eclipse Public License (EPL);
+ *  You may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *      http://www.opensource.org/licenses/eclipse-1.0.php
+ *
+ *  (C) Copyright IBM Corporation 2006-2014.
+ */
+
+import x10.array.*;
+import x10.compiler.Foreach;
+import x10.compiler.Inline;
+
+
+/**
+ * This is a sample program illustrating how to use
+ * X10's array classes.  It also illustrates the use
+ * of foreach to acheive intra-place parallelism.
+ *
+ * The program solves a set of 2D partial differential
+ * equations by iteratively applying a 5-point stencil
+ * operation until convergence is reached.
+ */
+public class HeatTransfer_v0 {
+    static val EPSILON = 1.0e-5;
+
+    val N:Long;
+    val A:Array_2[Double]{self!=null};
+    val Tmp:Array_2[Double]{self!=null};
+
+    public def this(size:Long) {
+        N = size;
+        A = new Array_2[Double](N+2, N+2);  // zero-initialized N+2 * N+2 array of doubles
+        for (j in 1..N) A(0, j) = 1;     // set one border row to 1 
+        Tmp = new Array_2[Double](A);
+    }
+
+    final @Inline def stencil(x:Long, y:Long):Double {
+        return (A(x-1,y) + A(x+1,y) + A(x,y-1) + A(x,y+1)) / 4;
+    }
+
+    def run() {
+        val is = new DenseIterationSpace_2(1,1,N,N);
+        var delta:Double;
+        do {
+            // Compute new values, storing in tmp
+            delta = Foreach.blockReduce(is,
+                (i:Long, j:Long)=>{
+                    Tmp(i,j) = stencil(i,j);
+                    // Reduce max element-wise delta (A now holds previous values)
+                    return Math.abs(Tmp(i,j) - A(i,j));
+                },
+                (a:Double, b:Double)=>Math.max(a,b), 0.0
+            );
+
+            // swap backing data of A and Tmp
+            Array.swap(A, Tmp);
+        } while (delta > EPSILON);
+    }
+
+    def prettyPrintResult() {
+       for (i in 1..N) {
+           for (j in 1..N) {
+                Console.OUT.printf("%1.4f ",A(i,j));
+            }
+            Console.OUT.println();
+        }
+    }
+
+    public static def main(args:Rail[String]) {
+        val n = args.size > 0 ? Long.parse(args(0)) : 8;
+        Console.OUT.println("HeatTransfer example with N="+n+" and epsilon="+EPSILON);
+        Console.OUT.println("Initializing data structures");
+        val ht = new HeatTransfer_v0(n);
+        Console.OUT.println("Beginning computation...");
+        val start = System.nanoTime();
+        ht.run();
+        val stop = System.nanoTime();
+        Console.OUT.printf("...completed in %1.3f seconds.\n", ((stop-start) as double)/1e9);
+        if (n <= 10) {
+            ht.prettyPrintResult();
+        }
+    }
+}