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