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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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import java.util.*; |
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import java.util.concurrent.*; |
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//import jsr166y.*; |
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/* |
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/** |
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* Based loosely on Java Grande Forum barrierBench |
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*/ |
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public class PhaserLoops { |
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static final int NCPUS = Runtime.getRuntime().availableProcessors(); |
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static final ExecutorService pool = Executors.newCachedThreadPool(); |
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public void run() { |
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int n = size; |
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Phaser b = phaser; |
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for(int i = 0; i < n; ++i) |
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for (int i = 0; i < n; ++i) |
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b.arriveAndAwaitAdvance(); |
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} |
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} |
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int nthreads = NCPUS; |
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if (args.length > 0) |
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nthreads = Integer.parseInt(args[0]); |
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System.out.printf("max %d Threads\n", nthreads); |
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for (int k = 2; k <= nthreads; k *= 2) { |
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for (int size = FIRST_SIZE; size <= LAST_SIZE; size *= 10) { |
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long startTime = System.nanoTime(); |
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Phaser phaser = new Phaser(); |
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PhaserAction[] actions = new PhaserAction[nthreads]; |
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for (int i = 0; i < k; ++i) { |
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actions[i] = new PhaserAction(i, phaser, size); |
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} |
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Future[] futures = new Future[k]; |
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for (int i = 0; i < k; ++i) { |
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futures[i] = pool.submit(actions[i]); |
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} |
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pool.shutdown(); |
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} |
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} |
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} |
