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 com.oracle.java.testlibrary.ProcessTools; 34 import com.oracle.java.testlibrary.OutputAnalyzer; 35 import java.util.ArrayList; 36 import java.util.Arrays; 37 import java.util.Collections; 38 39 public class TestDynamicNumberOfGCThreads { 40 public static void main(String[] args) throws Exception { 41 42 testDynamicNumberOfGCThreads("UseConcMarkSweepGC", true); 43 testDynamicNumberOfGCThreads("UseConcMarkSweepGC", false); 44 45 testDynamicNumberOfGCThreads("UseG1GC", true); 46 testDynamicNumberOfGCThreads("UseG1GC", false); 47 48 testDynamicNumberOfGCThreads("UseParallelGC", true); 49 testDynamicNumberOfGCThreads("UseParallelGC", false); 50 } 51 52 private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output) { 53 output.shouldHaveExitValue(0); // test should run succesfully 54 output.shouldContain("new_active_workers"); 55 } 56 57 private static void testDynamicNumberOfGCThreads(String gcFlag, boolean emulate_uniprocessor) throws Exception { 58 // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled 59 String[] defaults = {"-XX:+" + gcFlag, "-Xmx10M", "-XX:+PrintGCDetails", "-XX:+UseDynamicNumberOfGCThreads", "-XX:+TraceDynamicGCThreads", GCTest.class.getName()}; 60 ArrayList<String> args = new ArrayList(); 61 Collections.addAll(args, defaults); 62 Arrays.asList(defaults); 63 // Ensure it works on uniprocessors or if user specifies -XX:ParallelGCThread=1. 64 if (emulate_uniprocessor) { 65 args.add(0, "-XX:+ForceDynamicNumberOfGCThreads"); 66 args.add(0, "-XX:ParallelGCThreads=1"); 67 } 68 String[] finalArgs = new String[args.size()]; 69 finalArgs = args.toArray(finalArgs); 70 ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(finalArgs); 71 verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start())); 72 } 73 74 static class GCTest { 75 private static byte[] garbage; 76 public static void main(String [] args) { 77 System.out.println("Creating garbage"); 78 // create 128MB of garbage. This should result in at least one GC 79 for (int i = 0; i < 1024; i++) { 80 garbage = new byte[128 * 1024]; 81 } 82 System.out.println("Done"); 83 } 84 } 85 }