1 /* 2 * Copyright (c) 2014, 2019, 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 package gc.arguments; 25 26 /* 27 * @test TestParallelGCThreads 28 * @key gc 29 * @bug 8059527 8081382 30 * @summary Tests argument processing for ParallelGCThreads 31 * @library /test/lib 32 * @library / 33 * @modules java.base/jdk.internal.misc 34 * java.management 35 * @run driver gc.arguments.TestParallelGCThreads 36 */ 37 38 import jdk.test.lib.Asserts; 39 import jdk.test.lib.process.OutputAnalyzer; 40 import jdk.test.lib.process.ProcessTools; 41 42 public class TestParallelGCThreads { 43 44 public static void main(String args[]) throws Exception { 45 testFlags(); 46 testDefaultValue(); 47 } 48 49 private static final String flagName = "ParallelGCThreads"; 50 51 // uint ParallelGCThreads = 23 {product} 52 private static final String printFlagsFinalPattern = " *uint *" + flagName + " *:?= *(\\d+) *\\{product\\} *"; 53 54 public static void testDefaultValue() throws Exception { 55 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 56 "-XX:+UnlockExperimentalVMOptions", "-XX:+PrintFlagsFinal", "-version"); 57 58 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 59 String value = output.firstMatch(printFlagsFinalPattern, 1); 60 61 try { 62 Asserts.assertNotNull(value, "Couldn't find uint flag " + flagName); 63 64 Long longValue = new Long(value); 65 66 // Sanity check that we got a non-zero value. 67 Asserts.assertNotEquals(longValue, "0"); 68 69 output.shouldHaveExitValue(0); 70 } catch (Exception e) { 71 System.err.println(output.getOutput()); 72 throw e; 73 } 74 } 75 76 public static void testFlags() throws Exception { 77 // For each parallel collector (G1, Parallel, ParNew/CMS) 78 for (String gc : new String[] {"G1", "Parallel", "ConcMarkSweep"}) { 79 80 // Make sure the VM does not allow ParallelGCThreads set to 0 81 String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"}; 82 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); 83 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 84 output.shouldHaveExitValue(1); 85 86 // Do some basic testing to ensure the flag updates the count 87 for (long i = 1; i <= 3; i++) { 88 flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 89 long count = getParallelGCThreadCount(flags); 90 Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!"); 91 } 92 } 93 94 // 4294967295 == (unsigned int) -1 95 // So setting ParallelGCThreads=4294967295 should give back 4294967295 96 // and setting ParallelGCThreads=4294967296 should give back 0. (SerialGC is ok with ParallelGCThreads=0) 97 for (long i = 4294967295L; i <= 4294967296L; i++) { 98 String[] flags = new String[] {"-XX:+UseSerialGC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 99 long count = getParallelGCThreadCount(flags); 100 Asserts.assertEQ(count, i % 4294967296L, "Specifying ParallelGCThreads=" + i + " does not set the thread count properly!"); 101 } 102 } 103 104 public static long getParallelGCThreadCount(String flags[]) throws Exception { 105 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); 106 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 107 output.shouldHaveExitValue(0); 108 String stdout = output.getStdout(); 109 return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout); 110 } 111 }