103 lines
4.1 KiB
Java
103 lines
4.1 KiB
Java
/*
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* Copyright (c) 2019, 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 gc.z;
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/*
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* @test TestHighUsage
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* @requires vm.gc.Z & !vm.graal.enabled
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* @summary Test ZGC "High Usage" rule
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* @library /test/lib
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* @run main/othervm gc.z.TestHighUsage
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*/
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import java.util.LinkedList;
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import jdk.test.lib.process.ProcessTools;
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public class TestHighUsage {
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static class Test {
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private static final int K = 1024;
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private static final int M = K * K;
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private static final long startAt = 16 * M;
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private static final long spikeAt = 4 * M;
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private static volatile LinkedList<byte[]> keepAlive;
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private static volatile Object dummy;
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public static void main(String[] args) throws Exception {
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System.out.println("Allocating live-set");
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// Allocate live-set
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keepAlive = new LinkedList<>();
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while (Runtime.getRuntime().freeMemory() > startAt) {
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while (Runtime.getRuntime().freeMemory() > startAt) {
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keepAlive.add(new byte[128 * K]);
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}
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// Compact live-set and let allocation rate settle down
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System.gc();
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Thread.sleep(2000);
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}
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System.out.println("Allocating garbage slowly");
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// Allocate garbage slowly, such that the sampled allocation rate on
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// average becomes zero MB/s for the last 1 second windows. If free
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// memory goes below the spike limit we induce an allocation spike.
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// The expected behavior is that the "High Usage" rule kicks in before
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// the spike happens, avoiding an "Allocation Stall".
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for (int i = 0; i < 300; i++) {
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final long free = Runtime.getRuntime().freeMemory();
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System.out.println("Free: " + (free / M) + "M");
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if (free > spikeAt) {
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// Low allocation rate
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dummy = new byte[128 * K];
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} else {
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// High allocation rate
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dummy = new byte[8 * M];
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}
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Thread.sleep(250);
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}
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System.out.println("Done");
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}
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}
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public static void main(String[] args) throws Exception {
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ProcessTools.executeTestJvm(new String[]{ "-XX:+UnlockExperimentalVMOptions",
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"-XX:+UseZGC",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:-ZProactive",
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"-Xms128M",
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"-Xmx128M",
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"-XX:ParallelGCThreads=1",
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"-XX:ConcGCThreads=1",
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"-Xlog:gc",
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Test.class.getName() })
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.shouldNotContain("Allocation Stall")
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.shouldContain("High Usage")
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.shouldHaveExitValue(0);
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}
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}
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