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99 lines
3.1 KiB
Java
99 lines
3.1 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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package gc;
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/*
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* @test id=Parallel
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* @requires vm.gc.Parallel
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* @requires !vm.debug
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* @summary Verifies that the UseGCOverheadLimit functionality works in Parallel GC.
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* @library /test/lib
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* @run driver gc.TestUseGCOverheadLimit Parallel
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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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* @requires !vm.debug
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* @summary Verifies that the UseGCOverheadLimit functionality works in G1 GC.
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* @library /test/lib
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* @run driver gc.TestUseGCOverheadLimit G1
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*/
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import java.util.Arrays;
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import java.util.stream.Stream;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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public class TestUseGCOverheadLimit {
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public static void main(String args[]) throws Exception {
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String[] parallelArgs = {
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"-XX:+UseParallelGC",
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"-XX:NewSize=122m",
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"-XX:SurvivorRatio=99",
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"-XX:GCHeapFreeLimit=10"
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};
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String[] g1Args = {
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"-XX:+UseG1GC",
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"-XX:GCHeapFreeLimit=5"
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};
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String[] selectedArgs = args[0].equals("G1") ? g1Args : parallelArgs;
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final String[] commonArgs = {
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"-XX:-UseCompactObjectHeaders", // Object sizes are calculated such that the heap is tight.
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"-XX:ParallelGCThreads=1", // Make GCs take longer.
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"-XX:+UseGCOverheadLimit",
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"-Xlog:gc=debug",
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"-XX:GCTimeLimit=80", // Ease the CPU requirement.
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"-Xmx128m",
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Allocating.class.getName()
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};
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String[] vmArgs = Stream.concat(Arrays.stream(selectedArgs), Arrays.stream(commonArgs)).toArray(String[]::new);
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OutputAnalyzer output = ProcessTools.executeLimitedTestJava(vmArgs);
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output.shouldNotHaveExitValue(0);
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System.out.println(output.getStdout());
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output.stdoutShouldContain("GC Overhead Limit exceeded too often (5).");
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}
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static class Allocating {
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public static void main(String[] args) {
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Object[] cache = new Object[1024 * 1024 * 2];
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// Allocate random objects, keeping around data, causing garbage
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// collections.
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for (int i = 0; i < 1024* 1024 * 30; i++) {
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Object[] obj = new Object[10];
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cache[i % cache.length] = obj;
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}
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System.out.println(cache);
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}
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}
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}
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