| /* |
| * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
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| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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| */ |
| |
| /* |
| * @test TestParallelGCThreads |
| * @key gc |
| * @bug 8059527 8081382 |
| * @summary Tests argument processing for ParallelGCThreads |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| * @run driver TestParallelGCThreads |
| */ |
| |
| import jdk.test.lib.Asserts; |
| import jdk.test.lib.process.OutputAnalyzer; |
| import jdk.test.lib.process.ProcessTools; |
| |
| public class TestParallelGCThreads { |
| |
| public static void main(String args[]) throws Exception { |
| testFlags(); |
| testDefaultValue(); |
| } |
| |
| private static final String flagName = "ParallelGCThreads"; |
| |
| // uint ParallelGCThreads = 23 {product} |
| private static final String printFlagsFinalPattern = " *uint *" + flagName + " *:?= *(\\d+) *\\{product\\} *"; |
| |
| public static void testDefaultValue() throws Exception { |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( |
| "-XX:+UnlockExperimentalVMOptions", "-XX:+PrintFlagsFinal", "-version"); |
| |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| String value = output.firstMatch(printFlagsFinalPattern, 1); |
| |
| try { |
| Asserts.assertNotNull(value, "Couldn't find uint flag " + flagName); |
| |
| Long longValue = new Long(value); |
| |
| // Sanity check that we got a non-zero value. |
| Asserts.assertNotEquals(longValue, "0"); |
| |
| output.shouldHaveExitValue(0); |
| } catch (Exception e) { |
| System.err.println(output.getOutput()); |
| throw e; |
| } |
| } |
| |
| public static void testFlags() throws Exception { |
| // For each parallel collector (G1, Parallel, ParNew/CMS) |
| for (String gc : new String[] {"G1", "Parallel", "ConcMarkSweep"}) { |
| |
| // Make sure the VM does not allow ParallelGCThreads set to 0 |
| String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"}; |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| output.shouldHaveExitValue(1); |
| |
| // Do some basic testing to ensure the flag updates the count |
| for (long i = 1; i <= 3; i++) { |
| flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; |
| long count = getParallelGCThreadCount(flags); |
| Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!"); |
| } |
| } |
| |
| // 4294967295 == (unsigned int) -1 |
| // So setting ParallelGCThreads=4294967295 should give back 4294967295 |
| // and setting ParallelGCThreads=4294967296 should give back 0. (SerialGC is ok with ParallelGCThreads=0) |
| for (long i = 4294967295L; i <= 4294967296L; i++) { |
| String[] flags = new String[] {"-XX:+UseSerialGC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; |
| long count = getParallelGCThreadCount(flags); |
| Asserts.assertEQ(count, i % 4294967296L, "Specifying ParallelGCThreads=" + i + " does not set the thread count properly!"); |
| } |
| } |
| |
| public static long getParallelGCThreadCount(String flags[]) throws Exception { |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| output.shouldHaveExitValue(0); |
| String stdout = output.getStdout(); |
| return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout); |
| } |
| } |