1 /* 2 * Copyright (c) 2014, 2015, 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 /testlibrary 30 * @modules java.base/jdk.internal.misc 31 * java.management 32 * @run driver TestParallelGCThreads 33 */ 34 35 import jdk.test.lib.*; 36 37 public class TestParallelGCThreads { 38 39 public static void main(String args[]) throws Exception { 40 testFlags(); 41 testDefaultValue(); 42 } 43 44 private static final String flagName = "ParallelGCThreads"; 45 46 // uint ParallelGCThreads = 23 {product} 47 private static final String printFlagsFinalPattern = " *uint *" + flagName + " *:?= *(\\d+) *\\{product\\} *"; 48 49 public static void testDefaultValue() throws Exception { 50 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 51 "-XX:+UnlockExperimentalVMOptions", "-XX:+PrintFlagsFinal", "-version"); 52 53 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 54 String value = output.firstMatch(printFlagsFinalPattern, 1); 55 56 try { 57 Asserts.assertNotNull(value, "Couldn't find uint flag " + flagName); 58 59 Long longValue = new Long(value); 60 61 // Sanity check that we got a non-zero value. 62 Asserts.assertNotEquals(longValue, "0"); 63 64 output.shouldHaveExitValue(0); 65 } catch (Exception e) { 66 System.err.println(output.getOutput()); 67 throw e; 68 } 69 } 70 71 public static void testFlags() throws Exception { 72 // For each parallel collector (G1, Parallel, ParNew/CMS) 73 for (String gc : new String[] {"G1", "Parallel", "ConcMarkSweep"}) { 74 75 // Make sure the VM does not allow ParallelGCThreads set to 0 76 String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"}; 77 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); 78 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 79 output.shouldHaveExitValue(1); 80 81 // Do some basic testing to ensure the flag updates the count 82 for (long i = 1; i <= 3; i++) { 83 flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 84 long count = getParallelGCThreadCount(flags); 85 Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!"); 86 } 87 } 88 89 // 4294967295 == (unsigned int) -1 90 // So setting ParallelGCThreads=4294967295 should give back 4294967295 91 // and setting ParallelGCThreads=4294967296 should give back 0. (SerialGC is ok with ParallelGCThreads=0) 92 for (long i = 4294967295L; i <= 4294967296L; i++) { 93 String[] flags = new String[] {"-XX:+UseSerialGC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 94 long count = getParallelGCThreadCount(flags); 95 Asserts.assertEQ(count, i % 4294967296L, "Specifying ParallelGCThreads=" + i + " does not set the thread count properly!"); 96 } 97 } 98 99 public static long getParallelGCThreadCount(String flags[]) throws Exception { 100 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags); 101 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 102 output.shouldHaveExitValue(0); 103 String stdout = output.getStdout(); 104 return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout); 105 } 106 }