1 /* 2 * Copyright (c) 2015, 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.ergonomics; 25 26 /* 27 * @test TestDynamicNumberOfGCThreads 28 * @bug 8017462 29 * @summary Ensure that UseDynamicNumberOfGCThreads runs 30 * @requires vm.gc.Parallel & vm.gc.G1 & vm.gc.ConcMarkSweep 31 * @key gc 32 * @modules java.base/jdk.internal.misc 33 * @library /test/lib 34 * @build sun.hotspot.WhiteBox 35 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission 36 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI gc.ergonomics.TestDynamicNumberOfGCThreads 37 */ 38 39 import jdk.test.lib.process.OutputAnalyzer; 40 import jdk.test.lib.process.ProcessTools; 41 import sun.hotspot.gc.GC; 42 43 public class TestDynamicNumberOfGCThreads { 44 public static void main(String[] args) throws Exception { 45 46 testDynamicNumberOfGCThreads("UseConcMarkSweepGC"); 47 48 testDynamicNumberOfGCThreads("UseG1GC"); 49 50 testDynamicNumberOfGCThreads("UseParallelGC"); 51 52 if (GC.Shenandoah.isSupported()) { 53 testDynamicNumberOfGCThreads("UseShenandoahGC"); 54 } 55 } 56 57 private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) { 58 output.shouldHaveExitValue(0); // test should run succesfully 59 output.shouldContain("new_active_workers"); 60 } 61 62 private static void testDynamicNumberOfGCThreads(String gcFlag) throws Exception { 63 // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled 64 String[] baseArgs = {"-XX:+UnlockExperimentalVMOptions", "-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", GCTest.class.getName()}; 65 66 // Base test with gc and +UseDynamicNumberOfGCThreads: 67 ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs); 68 verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start())); 69 70 // Ensure it also works on uniprocessors or if user specifies -XX:ParallelGCThreads=1: 71 String[] extraArgs = {"-XX:+UnlockDiagnosticVMOptions", "-XX:+ForceDynamicNumberOfGCThreads", "-XX:ParallelGCThreads=1"}; 72 String[] finalArgs = new String[baseArgs.length + extraArgs.length]; 73 System.arraycopy(extraArgs, 0, finalArgs, 0, extraArgs.length); 74 System.arraycopy(baseArgs, 0, finalArgs, extraArgs.length, baseArgs.length); 75 pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs); 76 verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start())); 77 78 // Turn on parallel reference processing 79 String[] parRefProcArg = {"-XX:+ParallelRefProcEnabled", "-XX:-ShowMessageBoxOnError"}; 80 String[] parRefArgs = new String[baseArgs.length + parRefProcArg.length]; 81 System.arraycopy(parRefProcArg, 0, parRefArgs, 0, parRefProcArg.length); 82 System.arraycopy(baseArgs, 0, parRefArgs, parRefProcArg.length, baseArgs.length); 83 pb_enabled = ProcessTools.createJavaProcessBuilder(parRefArgs); 84 verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start())); 85 } 86 87 static class GCTest { 88 private static byte[] garbage; 89 public static void main(String [] args) { 90 System.out.println("Creating garbage"); 91 // create 128MB of garbage. This should result in at least one GC 92 for (int i = 0; i < 1024; i++) { 93 garbage = new byte[128 * 1024]; 94 } 95 System.out.println("Done"); 96 } 97 } 98 }