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 * @build sun.hotspot.WhiteBox 36 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission 37 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI gc.arguments.TestParallelGCThreads 38 */ 39 40 import java.util.ArrayList; 41 import java.util.List; 42 import jdk.test.lib.Asserts; 43 import jdk.test.lib.process.OutputAnalyzer; 44 import jdk.test.lib.process.ProcessTools; 45 import jtreg.SkippedException; 46 import sun.hotspot.gc.GC; 47 48 public class TestParallelGCThreads { 49 main(String args[])50 public static void main(String args[]) throws Exception { 51 testFlags(); 52 testDefaultValue(); 53 } 54 55 private static final String flagName = "ParallelGCThreads"; 56 57 // uint ParallelGCThreads = 23 {product} 58 private static final String printFlagsFinalPattern = " *uint *" + flagName + " *:?= *(\\d+) *\\{product\\} *"; 59 testDefaultValue()60 public static void testDefaultValue() throws Exception { 61 ProcessBuilder pb = GCArguments.createJavaProcessBuilder( 62 "-XX:+UnlockExperimentalVMOptions", "-XX:+PrintFlagsFinal", "-version"); 63 64 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 65 String value = output.firstMatch(printFlagsFinalPattern, 1); 66 67 try { 68 Asserts.assertNotNull(value, "Couldn't find uint flag " + flagName); 69 70 Long longValue = new Long(value); 71 72 // Sanity check that we got a non-zero value. 73 Asserts.assertNotEquals(longValue, "0"); 74 75 output.shouldHaveExitValue(0); 76 } catch (Exception e) { 77 System.err.println(output.getOutput()); 78 throw e; 79 } 80 } 81 testFlags()82 public static void testFlags() throws Exception { 83 // For each parallel collector (G1, Parallel) 84 List<String> supportedGC = new ArrayList<String>(); 85 86 if (GC.G1.isSupported()) { 87 supportedGC.add("G1"); 88 } 89 if (GC.Parallel.isSupported()) { 90 supportedGC.add("Parallel"); 91 } 92 93 if (supportedGC.isEmpty()) { 94 throw new SkippedException("Skipping test because none of G1/Parallel is supported."); 95 } 96 97 for (String gc : supportedGC) { 98 99 // Make sure the VM does not allow ParallelGCThreads set to 0 100 String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"}; 101 ProcessBuilder pb = GCArguments.createJavaProcessBuilder(flags); 102 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 103 output.shouldHaveExitValue(1); 104 105 // Do some basic testing to ensure the flag updates the count 106 for (long i = 1; i <= 3; i++) { 107 flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 108 long count = getParallelGCThreadCount(flags); 109 Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!"); 110 } 111 } 112 113 // 4294967295 == (unsigned int) -1 114 // So setting ParallelGCThreads=4294967295 should give back 4294967295 115 // and setting ParallelGCThreads=4294967296 should give back 0. (SerialGC is ok with ParallelGCThreads=0) 116 for (long i = 4294967295L; i <= 4294967296L; i++) { 117 String[] flags = new String[] {"-XX:+UseSerialGC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"}; 118 long count = getParallelGCThreadCount(flags); 119 Asserts.assertEQ(count, i % 4294967296L, "Specifying ParallelGCThreads=" + i + " does not set the thread count properly!"); 120 } 121 } 122 getParallelGCThreadCount(String flags[])123 public static long getParallelGCThreadCount(String flags[]) throws Exception { 124 ProcessBuilder pb = GCArguments.createJavaProcessBuilder(flags); 125 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 126 output.shouldHaveExitValue(0); 127 String stdout = output.getStdout(); 128 return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout); 129 } 130 } 131