111 lines
4.4 KiB
Java
111 lines
4.4 KiB
Java
/*
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* Copyright (c) 2018, 2024, 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.stress;
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/*
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* @test TestReclaimStringsLeaksMemory
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* @bug 8180048
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* @summary Ensure that during a Full GC interned string memory is reclaimed completely.
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* @requires vm.gc == "null"
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* @requires !vm.debug
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* @run driver gc.stress.TestReclaimStringsLeaksMemory
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* @run driver gc.stress.TestReclaimStringsLeaksMemory -XX:+UseSerialGC
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* @run driver gc.stress.TestReclaimStringsLeaksMemory -XX:+UseParallelGC
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* @run driver gc.stress.TestReclaimStringsLeaksMemory -XX:+UseG1GC
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*/
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import java.util.Arrays;
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import java.util.ArrayList;
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import java.util.regex.Pattern;
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import java.util.regex.Matcher;
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import jdk.test.lib.Asserts;
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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 TestReclaimStringsLeaksMemory {
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// The amount of memory in B reserved in the "Symbol" category that indicates a memory leak for
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// this test.
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public static final int ReservedThreshold = 70000000;
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public static void main(String[] args) throws Exception {
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ArrayList<String> baseargs = new ArrayList<>(Arrays.asList("-Xms256M",
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"-Xmx256M",
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"-Xlog:gc*,stringtable*=debug,oopstorage+blocks=debug:gc.log",
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"-XX:NativeMemoryTracking=summary",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:+PrintNMTStatistics" ));
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baseargs.addAll(Arrays.asList(args));
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baseargs.add(GCTest.class.getName());
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OutputAnalyzer output = ProcessTools.executeLimitedTestJava(baseargs);
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verifySymbolMemoryUsageNotTooHigh(output);
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}
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private static void verifySymbolMemoryUsageNotTooHigh(OutputAnalyzer output) throws Exception {
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String stdout = output.getStdout();
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System.out.println(stdout);
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Pattern p = Pattern.compile("Symbol \\(reserved=(\\d*)");
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Matcher m = p.matcher(stdout);
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if (!m.find()) {
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throw new RuntimeException("Could not find Symbol memory usage in NMT output");
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}
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int reserved = Integer.parseInt(m.group(1));
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Asserts.assertLT(reserved, ReservedThreshold, "Reserved memory size is " + reserved + "B which is greater than or equal to " + ReservedThreshold + "B indicating a memory leak");
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output.shouldHaveExitValue(0);
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}
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static class GCTest {
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public static final String BaseName = "SomeRandomBaseString";
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public static volatile String lastString;
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public static void main(String [] args) {
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for (int iterations = 0; iterations < 20;) {
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for (int i = 0; i < 1000000; i++) {
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lastString = (BaseName + i).intern();
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}
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if (++iterations % 5 == 0) {
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System.gc();
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}
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}
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// Do one last GC and sleep to give ServiceThread a chance to run.
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System.out.println("One last gc");
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System.gc();
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for (int i = 0; i < 100; i++) {
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try {
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Thread.sleep(10);
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} catch (InterruptedException ex) {
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}
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}
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System.out.println("End of test");
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}
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}
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}
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