65 lines
2.5 KiB
Java
65 lines
2.5 KiB
Java
/*
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* Copyright (c) 2008, 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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import static java.util.concurrent.TimeUnit.NANOSECONDS;
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import java.util.concurrent.DelayQueue;
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import java.util.concurrent.Delayed;
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import java.util.concurrent.TimeUnit;
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/**
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* This is not a regression test, but a stress benchmark test for
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* 6609775: Reduce context switches in DelayQueue due to signalAll
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*
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* This runs in the same wall clock time, but much reduced cpu time,
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* with the changes for 6609775.
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*/
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public class Stress {
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public static void main(String[] args) throws Throwable {
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final DelayQueue<Delayed> q = new DelayQueue<>();
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final long t0 = System.nanoTime();
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for (long i = 0; i < 1000; i++) {
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final long expiry = t0 + i*10L*1000L*1000L;
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q.add(new Delayed() {
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public long getDelay(TimeUnit unit) {
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return unit.convert(expiry - System.nanoTime(),
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NANOSECONDS);
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}
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public int compareTo(Delayed x) {
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long d = getDelay(NANOSECONDS)
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- x.getDelay(NANOSECONDS);
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return d < 0 ? -1 : d > 0 ? 1 : 0; }});
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}
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for (int i = 0; i < 300; i++)
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new Thread() { public void run() {
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try {
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while (!q.isEmpty())
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q.poll(10L, TimeUnit.SECONDS);
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} catch (Throwable t) { t.printStackTrace(); }
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}}.start();
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}
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}
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