104 lines
3.0 KiB
Java
104 lines
3.0 KiB
Java
/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.lang;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.TearDown;
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import org.openjdk.jmh.annotations.Warmup;
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import java.util.concurrent.TimeUnit;
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/**
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* Test to launch and gather threads. Measure time for different parts.
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@State(Scope.Benchmark)
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@Warmup(iterations = 5, time = 1)
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@Measurement(iterations = 5, time = 1)
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@Fork(value = 3)
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public class ThreadStartJoin {
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private static final int THREADS = Runtime.getRuntime().availableProcessors();
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private Thread[] ts;
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@Benchmark
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public void test() throws InterruptedException {
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ts = new TestThread[THREADS];
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for (int i = 0; i < THREADS; i++) {
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ts[i] = new TestThread();
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}
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for (int i = 0; i < THREADS; i++) {
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ts[i].start();
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}
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for (Thread mythread : ts) {
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mythread.join();
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if (mythread.isAlive()) {
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throw new IllegalStateException("Couldn't join in time in LPHhello.");
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}
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}
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}
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@TearDown
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public final void cleanup() {
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if (ts != null) {
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for (Thread t : ts) {
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if (t != null) {
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t.interrupt();
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}
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}
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ts = null;
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}
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}
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static final class TestThread extends Thread {
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private static int num = 0;
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public TestThread() {
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super(TestThread.name());
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}
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private synchronized static String name() {
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return "TestThread-" + num++;
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}
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public void run() {
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// do nothing
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}
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}
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}
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