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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
*/
/*
* @test
* @bug 4965960
* @summary Exercise ExecutorCompletionService
* @library /lib/testlibrary/
*/
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import jdk.testlibrary.Utils;
public class ExecutorCompletionServiceLoops {
static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
static final int POOLSIZE = 10;
static final ExecutorService pool =
Executors.newFixedThreadPool(POOLSIZE);
static final ExecutorCompletionService<Integer> ecs =
new ExecutorCompletionService<>(pool);
static boolean print = false;
public static void main(String[] args) throws Exception {
int max = 8;
int base = 2000;
if (args.length > 0)
max = Integer.parseInt(args[0]);
System.out.println("Warmup...");
oneTest(base);
print = true;
for (int i = 1; i <= max; i += (i+1) >>> 1) {
System.out.print("n: " + i * base);
oneTest(i * base);
}
pool.shutdown();
if (! pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS))
throw new Error();
}
static class Task implements Callable<Integer> {
public Integer call() {
int s = 0;
int l = System.identityHashCode(this);
for (int i = 0; i < 5; ++i) {
l = LoopHelpers.compute2(l);
s += LoopHelpers.compute1(l);
}
return new Integer(s);
}
}
static class Producer implements Runnable {
final ExecutorCompletionService cs;
final int iters;
Producer(ExecutorCompletionService ecs, int i) {
cs = ecs;
iters = i;
}
public void run() {
for (int i = 0; i < iters; ++i)
ecs.submit(new Task());
}
}
static void oneTest(int iters) throws Exception {
long startTime = System.nanoTime();
new Thread(new Producer(ecs, iters)).start();
int r = 0;
for (int i = 0; i < iters; ++i)
r += ecs.take().get().intValue();
long elapsed = System.nanoTime() - startTime;
long tpi = elapsed/ iters;
if (print)
System.out.println("\t: " + LoopHelpers.rightJustify(tpi) + " ns per task");
if (r == 0) // avoid overoptimization
System.out.println("useless result: " + r);
}
}
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