TestParallelGCThreads.java revision 11833:1cbffa2beba6
1/* 2* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. 3* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4* 5* This code is free software; you can redistribute it and/or modify it 6* under the terms of the GNU General Public License version 2 only, as 7* published by the Free Software Foundation. 8* 9* This code is distributed in the hope that it will be useful, but WITHOUT 10* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12* version 2 for more details (a copy is included in the LICENSE file that 13* accompanied this code). 14* 15* You should have received a copy of the GNU General Public License version 16* 2 along with this work; if not, write to the Free Software Foundation, 17* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18* 19* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20* or visit www.oracle.com if you need additional information or have any 21* questions. 22*/ 23 24/* 25 * @test TestParallelGCThreads 26 * @key gc 27 * @bug 8059527 8081382 28 * @summary Tests argument processing for ParallelGCThreads 29 * @library /test/lib 30 * @modules java.base/jdk.internal.misc 31 * java.management 32 * @run driver TestParallelGCThreads 33 */ 34 35import jdk.test.lib.Asserts; 36import jdk.test.lib.process.OutputAnalyzer; 37import jdk.test.lib.process.ProcessTools; 38 39public class TestParallelGCThreads { 40 41 public static void main(String args[]) throws Exception { 42 testFlags(); 43 testDefaultValue(); 44 } 45 46 private static final String flagName = "ParallelGCThreads"; 47 48 // uint ParallelGCThreads = 23 {product} 49 private static final String printFlagsFinalPattern = " *uint *" + flagName + " *:?= *(\\d+) *\\{product\\} *"; 50 51 public static void testDefaultValue() throws Exception { 52 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 53 "-XX:+UnlockExperimentalVMOptions", "-XX:+PrintFlagsFinal", "-version"); 54 55 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 56 String value = output.firstMatch(printFlagsFinalPattern, 1); 57 58 try { 59 Asserts.assertNotNull(value, "Couldn't find uint flag " + flagName); 60 61 Long longValue = new Long(value); 62 63 // Sanity check that we got a non-zero value. 64 Asserts.assertNotEquals(longValue, "0"); 65 66 output.shouldHaveExitValue(0); 67 } catch (Exception e) { 68 System.err.println(output.getOutput()); 69 throw e; 70 } 71 } 72 73 public static void testFlags() throws Exception { 74 // For each parallel collector (G1, Parallel, ParNew/CMS) 75 for (String gc : new String[] {"G1", "Parallel", "ConcMarkSweep"}) { 76 77 // Make sure the VM does not allow ParallelGCThreads set to 0 78 String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"}; 79 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); 80 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 81 output.shouldHaveExitValue(1); 82 83 // Do some basic testing to ensure the flag updates the count 84 for (long i = 1; i <= 3; i++) { 85 flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 86 long count = getParallelGCThreadCount(flags); 87 Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!"); 88 } 89 } 90 91 // 4294967295 == (unsigned int) -1 92 // So setting ParallelGCThreads=4294967295 should give back 4294967295 93 // and setting ParallelGCThreads=4294967296 should give back 0. (SerialGC is ok with ParallelGCThreads=0) 94 for (long i = 4294967295L; i <= 4294967296L; i++) { 95 String[] flags = new String[] {"-XX:+UseSerialGC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 96 long count = getParallelGCThreadCount(flags); 97 Asserts.assertEQ(count, i % 4294967296L, "Specifying ParallelGCThreads=" + i + " does not set the thread count properly!"); 98 } 99 } 100 101 public static long getParallelGCThreadCount(String flags[]) throws Exception { 102 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); 103 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 104 output.shouldHaveExitValue(0); 105 String stdout = output.getStdout(); 106 return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout); 107 } 108} 109