1 /* 2 * Copyright (c) 2015, 2018, 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 TestDynamicNumberOfGCThreads 26 * @bug 8017462 27 * @summary Ensure that UseDynamicNumberOfGCThreads runs 28 * @requires vm.gc=="null" 29 * @key gc 30 * @modules java.base/jdk.internal.misc 31 * @library /test/lib 32 * @build sun.hotspot.WhiteBox 33 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission 34 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestDynamicNumberOfGCThreads 35 */ 36 37 import jdk.test.lib.process.OutputAnalyzer; 38 import jdk.test.lib.process.ProcessTools; 39 import sun.hotspot.gc.GC; 40 41 public class TestDynamicNumberOfGCThreads { 42 public static void main(String[] args) throws Exception { 43 44 testDynamicNumberOfGCThreads("UseConcMarkSweepGC"); 45 46 testDynamicNumberOfGCThreads("UseG1GC"); 47 48 testDynamicNumberOfGCThreads("UseParallelGC"); 49 50 if (GC.Shenandoah.isSupported()) { 51 testDynamicNumberOfGCThreads("UseShenandoahGC"); 52 } 53 } 54 55 private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) { 56 output.shouldHaveExitValue(0); // test should run succesfully 57 output.shouldContain("new_active_workers"); 58 } 59 60 private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception { 61 // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled 62 String[] baseArgs = {"-XX:+UnlockExperimentalVMOptions", "-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", GCTest.class.getName()}; 63 64 // Base test with gc and +UseDynamicNumberOfGCThreads: 65 ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs); 66 verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start())); 67 68 // Ensure it also works on uniprocessors or if user specifies -XX:ParallelGCThreads=1: 69 String[] extraArgs = {"-XX:+UnlockDiagnosticVMOptions", "-XX:+ForceDynamicNumberOfGCThreads", "-XX:ParallelGCThreads=1"}; 70 String[] finalArgs = new String[baseArgs.length + extraArgs.length]; 71 System.arraycopy(extraArgs, 0, finalArgs, 0, extraArgs.length); 72 System.arraycopy(baseArgs, 0, finalArgs, extraArgs.length, baseArgs.length); 73 pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs); 74 verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start())); 75 76 // Turn on parallel reference processing 77 String[] parRefProcArg = {"-XX:+ParallelRefProcEnabled", "-XX:-ShowMessageBoxOnError"}; 78 String[] parRefArgs = new String[baseArgs.length + parRefProcArg.length]; 79 System.arraycopy(parRefProcArg, 0, parRefArgs, 0, parRefProcArg.length); 80 System.arraycopy(baseArgs, 0, parRefArgs, parRefProcArg.length, baseArgs.length); 81 pb_enabled = ProcessTools.createJavaProcessBuilder(parRefArgs); 82 verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start())); 83 } 84 85 static class GCTest { 86 private static byte[] garbage; 87 public static void main(String [] args) { 88 System.out.println("Creating garbage"); 89 // create 128MB of garbage. This should result in at least one GC 90 for (int i = 0; i < 1024; i++) { 91 garbage = new byte[128 * 1024]; 92 } 93 System.out.println("Done"); 94 } 95 } 96 }