russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
123 lines
4 KiB
Java
123 lines
4 KiB
Java
/*
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* Copyright (c) 2025, 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 id=Epsilon
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* @requires vm.gc.Epsilon
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* @bug 8368527
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* @summary Stress MemoryMXBean.getTotalGcCpuTime during shutdown
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* @library /test/lib
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* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestGetTotalGcCpuTime
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*/
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/*
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* @test id=Serial
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* @requires vm.gc.Serial
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* @bug 8368527
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* @summary Stress MemoryMXBean.getTotalGcCpuTime during shutdown
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* @library /test/lib
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* @run main/othervm -XX:+UseSerialGC TestGetTotalGcCpuTime
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*/
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/*
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* @test id=Parallel
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* @requires vm.gc.Parallel
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* @bug 8368527
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* @summary Stress MemoryMXBean.getTotalGcCpuTime during shutdown
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* @library /test/lib
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* @run main/othervm -XX:+UseParallelGC TestGetTotalGcCpuTime
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*/
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/*
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* @test id=G1
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* @requires vm.gc.G1
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* @bug 8368527
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* @summary Stress MemoryMXBean.getTotalGcCpuTime during shutdown
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* @library /test/lib
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* @run main/othervm -XX:+UseG1GC TestGetTotalGcCpuTime
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*/
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/*
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* @test id=ZGC
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* @requires vm.gc.Z
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* @bug 8368527
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* @summary Stress MemoryMXBean.getTotalGcCpuTime during shutdown
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* @library /test/lib
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* @run main/othervm -XX:+UseZGC TestGetTotalGcCpuTime
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*/
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/*
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* @test id=Shenandoah
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* @requires vm.gc.Shenandoah
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* @bug 8368527
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* @summary Stress MemoryMXBean.getTotalGcCpuTime during shutdown
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* @library /test/lib
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* @run main/othervm -XX:+UseShenandoahGC TestGetTotalGcCpuTime
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*/
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryMXBean;
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import java.lang.management.ThreadMXBean;
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import java.util.ArrayList;
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public class TestGetTotalGcCpuTime {
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static final ThreadMXBean mxThreadBean = ManagementFactory.getThreadMXBean();
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static final MemoryMXBean mxMemoryBean = ManagementFactory.getMemoryMXBean();
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static final boolean usingEpsilonGC = ManagementFactory.getRuntimeMXBean().getInputArguments().stream().anyMatch(p -> p.contains("-XX:+UseEpsilonGC"));
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private static ArrayList<Object> objs = null;
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public static void main(String[] args) throws Exception {
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try {
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if (!mxThreadBean.isThreadCpuTimeEnabled()) {
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return;
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}
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} catch (UnsupportedOperationException e) {
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if (mxMemoryBean.getTotalGcCpuTime() != -1) {
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throw new RuntimeException("GC CPU time should be -1");
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}
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return;
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}
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// Add some tracing work to ensure OSs with slower update rates would report usage
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for (int i = 0; i < 200; i++) {
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objs = new ArrayList<Object>();
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for (int j = 0; j < 5000; j++) {
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objs.add(new Object());
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}
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System.gc();
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}
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long gcCpuTimeFromThread = mxMemoryBean.getTotalGcCpuTime();
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if (usingEpsilonGC) {
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if (gcCpuTimeFromThread != 0) {
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throw new RuntimeException("Epsilon GC can't have any GC CPU time by definition");
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}
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} else {
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if (gcCpuTimeFromThread <= 0) {
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throw new RuntimeException("Some GC CPU time must have been reported");
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}
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}
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}
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}
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