heat equation: added a Chapel multi-core implementation

benchmarks/heat_equation/chapel_mcore/Makefile

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+# Makefile that builds each src/*.chpl file into a binary in bin/*
+
+CC=chpl
+CFLAGS=-g
+LDFLAGS=
+
+SRC=$(wildcard src/*.chpl)
+PROGRAM=$(addprefix bin/, $(subst .chpl,, $(subst src/,,$(SRC))))
+
+all: mkdir $(PROGRAM)
+
+bin/% : src/%.chpl
+	$(CC) $(CFLAGS) -o $@ $<
+
+.PHONY: clean mkdir
+
+mkdir:
+	mkdir -p bin
+clean:
+	rm -R bin

benchmarks/heat_equation/chapel_mcore/src/heat_equation.chpl

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+//The format of 'size' is two integers separated with a '*'.
+//The first integer is the domain size squired and the second integer is
+//the number of iterations.
+config const size = "100*10";//Default, 100 by 100 domain and 10 iterations
+config const epsilon = 1.0e-10;//Stop condition in amount of change
+
+//Parse the --size argument into 'n' and 'iterations'
+use Regexp;
+const arg = size.matches(compile("(\\d+)*(\\d+)"));
+const n = size.substring(arg[1][1]) : int;
+const iterations = size.substring(arg[2][1]) : int;
+
+//Initiate a Timer object
+use Time;
+var timer : Timer;
+
+//Now, let's implement the heat equation!
+
+//A n+2 by n+2 domain.
+const Grid = {0..n+1, 0..n+1};
+
+//A n by n domain that represents the interior of 'Grid'
+const Interior = {1..n, 1..n};
+
+var A, T : [Grid] real;//Zero initialized as default
+
+A[..,0] = -273.15;   //Left column
+A[..,n+1] = -273.15; //Right column
+A[n+1,..] = -273.15; //Bottom row
+A[0,..] = 40.0;      //Top row
+
+timer.start();
+var iter_count = 0;
+do{
+  //Since all iterations are independent, we can use 'forall', which allows
+  //the Chapel runtime system to calculate the iterations in parallel
+  forall (i,j) in Interior do//Iterate over all non-border cells
+  {
+    //Assign each cell in 'T' the mean of its neighboring cells in 'A'
+    T[i,j] = (A[i,j] + A[i-1,j] + A[i+1,j] + A[i,j-1] + A[i,j+1]) / 5;
+  }
+
+  //Delta is the total amount of change done in this iteration
+  const delta = + reduce abs(A[Interior] - T[Interior]);
+
+  //Copy back the non-border cells
+  A[Interior] = T[Interior];
+
+  //When 'delta' is smaller than 'epsilon' the calculation has converged
+  iter_count += 1;
+} while (delta > epsilon && iter_count >= iterations);
+
+timer.stop();
+writeln("Heat Equation (single machine) - n: ",n,
+        ", iterations: ", iterations,
+        ", elapsed-time: ", timer.elapsed(), " seconds");
+
+

suites/chapel.py

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+from benchpress.default import *
+
+scripts   = [
+    ('Heat Equation',  'heat_equation', '--size=100*10'),
+]
+
+chapel = {
+    'launchers':  [chapel_mcore],
+    'scripts':  scripts,
+}
+
+suites = [
+    chapel
+]
+