115 lines
4.0 KiB
Java
115 lines
4.0 KiB
Java
/*
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* Copyright (c) 2003, 2018, 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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/*
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* @test
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* @bug 4858522 8174734
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* @summary Basic unit test of HotspotRuntimeMBean.getSafepointSyncTime()
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* @author Steve Bohne
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*
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* @run main/othervm -XX:+UsePerfData GetSafepointSyncTime
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*/
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/*
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* This test is just a sanity check and does not check for the correct value.
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*/
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import sun.management.*;
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public class GetSafepointSyncTime {
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private static HotspotRuntimeMBean mbean =
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(HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
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private static final long NUM_THREAD_DUMPS = 300;
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static void checkPositive(long value, String label) {
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if (value < 0)
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throw new RuntimeException(label + " had a negative value of "
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+ value);
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}
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static void validate(long count1, long count2, long time1, long time2,
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String label) {
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checkPositive(count1, label + ":count1");
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checkPositive(count2, label + ":count2");
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checkPositive(time1, label + ":time1");
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checkPositive(time2, label + ":time2");
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long countDiff = count2 - count1;
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long timeDiff = time2 - time1;
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if (countDiff < NUM_THREAD_DUMPS) {
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throw new RuntimeException(label +
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": Expected at least " + NUM_THREAD_DUMPS +
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" safepoints but only got " + countDiff);
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}
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// getSafepointSyncTime is the accumulated time spent getting to a
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// safepoint, so each safepoint will add a little to this, but the
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// resolution is only milliseconds so we may not see it.
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if (timeDiff < 0) {
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throw new RuntimeException(label + ": Safepoint sync time " +
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"decreased unexpectedly " +
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"(time1 = " + time1 + "; " +
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"time2 = " + time2 + ")");
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}
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System.out.format("%s: Safepoint count=%d (diff=%d), sync time=%d ms (diff=%d)%n",
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label, count2, countDiff, time2, timeDiff);
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}
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public static void main(String args[]) throws Exception {
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long count = mbean.getSafepointCount();
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long time = mbean.getSafepointSyncTime();
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checkPositive(count, "count");
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checkPositive(time, "time");
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// Thread.getAllStackTraces() should cause a safepoint.
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for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
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Thread.getAllStackTraces();
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}
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long count1 = mbean.getSafepointCount();
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long time1 = mbean.getSafepointSyncTime();
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validate(count, count1, time, time1, "Pass 1");
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// repeat the experiment
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for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
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Thread.getAllStackTraces();
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}
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long count2 = mbean.getSafepointCount();
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long time2 = mbean.getSafepointSyncTime();
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validate(count1, count2, time1, time2, "Pass 2");
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System.out.println("Test passed.");
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}
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}
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