| 1 |
|
/* |
| 2 |
|
* Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 |
|
* Expert Group and released to the public domain, as explained at |
| 4 |
< |
* http://creativecommons.org/licenses/publicdomain |
| 4 |
> |
* http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 |
|
*/ |
| 6 |
|
|
| 7 |
– |
//import jsr166y.*; |
| 7 |
|
import java.util.concurrent.*; |
| 8 |
|
|
| 9 |
|
/** |
| 10 |
< |
* Sample program using Gaussian Quadrature for numerical integration. |
| 10 |
> |
* Sample program using Guassian Quadrature for numerical integration. |
| 11 |
|
* This version uses a simplified hardwired function. Inspired by a |
| 12 |
|
* <A href="http://www.cs.uga.edu/~dkl/filaments/dist.html"> |
| 13 |
|
* Filaments</A> demo program. |
| 25 |
|
static String forkArg = "dynamic"; |
| 26 |
|
|
| 27 |
|
// the function to integrate |
| 28 |
< |
static double computeFunction(double x) { |
| 28 |
> |
static double computeFunction(double x) { |
| 29 |
|
return (x * x + 1.0) * x; |
| 30 |
|
} |
| 31 |
|
|
| 39 |
|
static final int calls = 263479047; |
| 40 |
|
|
| 41 |
|
public static void main(String[] args) throws Exception { |
| 42 |
< |
int procs = Runtime.getRuntime().availableProcessors(); |
| 42 |
> |
int procs = 0; |
| 43 |
|
|
| 44 |
|
try { |
| 45 |
|
if (args.length > 0) |
| 53 |
|
} |
| 54 |
|
} |
| 55 |
|
catch (Exception e) { |
| 56 |
< |
System.out.println("Usage: java Integrate threads <s[erial] | d[ynamic] | f[ork] - default d>"); |
| 56 |
> |
System.out.println("Usage: java Integrate3 threads <s[erial] | d[ynamic] | f[ork] - default d>"); |
| 57 |
|
return; |
| 58 |
|
} |
| 59 |
+ |
oneTest(procs); |
| 60 |
+ |
oneTest(procs); |
| 61 |
+ |
oneTest(procs); |
| 62 |
+ |
} |
| 63 |
|
|
| 64 |
< |
ForkJoinPool g = new ForkJoinPool(procs); |
| 64 |
> |
static void oneTest(int procs) { |
| 65 |
> |
ForkJoinPool g = (procs == 0) ? new ForkJoinPool() : |
| 66 |
> |
new ForkJoinPool(procs); |
| 67 |
> |
System.out.println("Number of procs=" + g.getParallelism()); |
| 68 |
|
System.out.println("Integrating from " + start + " to " + end + |
| 69 |
|
" forkPolicy = " + forkArg); |
| 70 |
|
long lastTime = System.nanoTime(); |
| 71 |
< |
for (int i = 0; i < 10; ++i) { |
| 71 |
> |
for (int i = 0; i < 20; ++i) { |
| 72 |
|
double a; |
| 73 |
|
if (forkPolicy == SERIAL) |
| 74 |
|
a = SQuad.computeArea(g, start, end); |
| 77 |
|
else |
| 78 |
|
a = DQuad.computeArea(g, start, end); |
| 79 |
|
long now = System.nanoTime(); |
| 80 |
< |
double s = ((double) (now - lastTime)) / NPS; |
| 80 |
> |
double s = ((double)(now - lastTime))/NPS; |
| 81 |
|
lastTime = now; |
| 82 |
|
System.out.printf("Calls/sec: %12d", (long) (calls / s)); |
| 83 |
|
System.out.printf(" Time: %7.3f", s); |
| 84 |
< |
System.out.printf(" Area: %12.1f", a); |
| 84 |
> |
System.out.printf(" Threads: %5d", g.getPoolSize()); |
| 85 |
> |
// System.out.printf(" Area: %12.1f", a); |
| 86 |
|
System.out.println(); |
| 87 |
|
} |
| 88 |
|
System.out.println(g); |
| 168 |
|
q.fork(); |
| 169 |
|
ar = recEval(c, r, fc, fr, ar); |
| 170 |
|
if (!q.tryUnfork()) { |
| 171 |
< |
q.quietlyHelpJoin(); |
| 171 |
> |
q.quietlyJoin(); |
| 172 |
|
return ar + q.area; |
| 173 |
|
} |
| 174 |
|
return ar + recEval(l, c, fl, fc, al); |
| 216 |
|
(q = new DQuad(l, c, al)).fork(); |
| 217 |
|
ar = recEval(c, r, fc, fr, ar); |
| 218 |
|
if (q != null && !q.tryUnfork()) { |
| 219 |
< |
q.quietlyHelpJoin(); |
| 219 |
> |
q.quietlyJoin(); |
| 220 |
|
return ar + q.area; |
| 221 |
|
} |
| 222 |
|
return ar + recEval(l, c, fl, fc, al); |
