134 lines
5.1 KiB
Java
134 lines
5.1 KiB
Java
/*
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* Copyright (c) 2014, 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.arguments;
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/*
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* @test TestParallelGCThreads
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* @key gc
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* @bug 8059527 8081382
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* @summary Tests argument processing for ParallelGCThreads
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* @library /test/lib
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* @library /
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* @modules java.base/jdk.internal.misc
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* java.management
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* @build sun.hotspot.WhiteBox
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* @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI gc.arguments.TestParallelGCThreads
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*/
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import java.util.ArrayList;
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import java.util.List;
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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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import jtreg.SkippedException;
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import sun.hotspot.gc.GC;
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public class TestParallelGCThreads {
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public static void main(String args[]) throws Exception {
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testFlags();
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testDefaultValue();
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}
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private static final String flagName = "ParallelGCThreads";
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// uint ParallelGCThreads = 23 {product}
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private static final String printFlagsFinalPattern = " *uint *" + flagName + " *:?= *(\\d+) *\\{product\\} *";
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public static void testDefaultValue() throws Exception {
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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"-XX:+UnlockExperimentalVMOptions", "-XX:+PrintFlagsFinal", "-version");
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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String value = output.firstMatch(printFlagsFinalPattern, 1);
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try {
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Asserts.assertNotNull(value, "Couldn't find uint flag " + flagName);
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Long longValue = new Long(value);
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// Sanity check that we got a non-zero value.
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Asserts.assertNotEquals(longValue, "0");
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output.shouldHaveExitValue(0);
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} catch (Exception e) {
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System.err.println(output.getOutput());
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throw e;
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}
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}
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public static void testFlags() throws Exception {
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// For each parallel collector (G1, Parallel, ParNew/CMS)
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List<String> supportedGC = new ArrayList<String>();
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if (GC.G1.isSupported()) {
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supportedGC.add("G1");
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}
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if (GC.Parallel.isSupported()) {
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supportedGC.add("Parallel");
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}
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if (GC.ConcMarkSweep.isSupported()) {
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supportedGC.add("ConcMarkSweep");
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}
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if (supportedGC.isEmpty()) {
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throw new SkippedException("Skipping test because none of G1/Parallel/ConcMarkSweep is supported.");
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}
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for (String gc : supportedGC) {
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// Make sure the VM does not allow ParallelGCThreads set to 0
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String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"};
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.shouldHaveExitValue(1);
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// Do some basic testing to ensure the flag updates the count
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for (long i = 1; i <= 3; i++) {
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flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"};
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long count = getParallelGCThreadCount(flags);
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Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!");
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}
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}
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// 4294967295 == (unsigned int) -1
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// So setting ParallelGCThreads=4294967295 should give back 4294967295
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// and setting ParallelGCThreads=4294967296 should give back 0. (SerialGC is ok with ParallelGCThreads=0)
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for (long i = 4294967295L; i <= 4294967296L; i++) {
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String[] flags = new String[] {"-XX:+UseSerialGC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"};
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long count = getParallelGCThreadCount(flags);
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Asserts.assertEQ(count, i % 4294967296L, "Specifying ParallelGCThreads=" + i + " does not set the thread count properly!");
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}
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}
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public static long getParallelGCThreadCount(String flags[]) throws Exception {
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.shouldHaveExitValue(0);
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String stdout = output.getStdout();
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return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout);
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}
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}
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