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.arguments; 25 26 /* 27 * @test TestNewSizeThreadIncrease 28 * @key gc 29 * @bug 8144527 30 * @summary Tests argument processing for NewSizeThreadIncrease 31 * @library /test/lib 32 * @library / 33 * @requires vm.gc.Serial 34 * @modules java.base/jdk.internal.misc 35 * java.management 36 * @run main gc.arguments.TestNewSizeThreadIncrease 37 */ 38 39 40 import jdk.test.lib.Platform; 41 import jdk.test.lib.process.OutputAnalyzer; 42 import jdk.test.lib.process.ProcessTools; 43 44 45 // Range of NewSizeThreadIncrease is 0 ~ max_uintx. 46 // Total of 5 threads will be created (1 GCTest thread and 4 TestThread). 47 public class TestNewSizeThreadIncrease { 48 static final String VALID_VALUE = "2097152"; // 2MB 49 50 // This value will make an overflow of 'thread count * NewSizeThreadIncrease' at DefNewGeneration::compute_new_size(). 51 // = (max_uintx / 5) + 1, = (18446744073709551615 / 5) + 1 52 static String INVALID_VALUE_1 = "3689348814741910324"; 53 54 // This string is contained when compute_new_size() expands or shrinks. 55 static final String LOG_NEWSIZE_CHANGED = "New generation size "; 56 main(String[] args)57 public static void main(String[] args) throws Exception { 58 if (Platform.is32bit()) { 59 // (max_uintx / 5) + 1, 4294967295/5 + 1 60 INVALID_VALUE_1 = "858993460"; 61 } 62 63 // New size will be applied as NewSizeThreadIncrease is small enough to expand. 64 runNewSizeThreadIncreaseTest(VALID_VALUE, true); 65 66 // New size will be ignored as 'thread count * NewSizeThreadIncrease' overflows. 67 runNewSizeThreadIncreaseTest(INVALID_VALUE_1, false); 68 } 69 runNewSizeThreadIncreaseTest(String expectedValue, boolean isNewsizeChanged)70 static void runNewSizeThreadIncreaseTest(String expectedValue, boolean isNewsizeChanged) throws Exception { 71 ProcessBuilder pb = GCArguments.createJavaProcessBuilder("-XX:+UseSerialGC", 72 "-Xms96M", 73 "-Xmx128M", 74 "-XX:NewRatio=2", 75 "-Xlog:gc+heap+ergo=debug", 76 "-XX:NewSizeThreadIncrease="+expectedValue, 77 GCTest.class.getName()); 78 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 79 80 output.shouldHaveExitValue(0); 81 82 if (isNewsizeChanged) { 83 output.shouldContain(LOG_NEWSIZE_CHANGED); 84 } else { 85 output.shouldNotContain(LOG_NEWSIZE_CHANGED); 86 } 87 } 88 89 static class GCTest { 90 91 static final int MAX_THREADS_COUNT = 4; 92 static TestThread threads[] = new TestThread[MAX_THREADS_COUNT]; 93 main(String[] args)94 public static void main(String[] args) { 95 96 System.out.println("Creating garbage"); 97 98 for (int i=0; i<MAX_THREADS_COUNT; i++) { 99 threads[i] = new TestThread(); 100 threads[i].start(); 101 } 102 103 System.gc(); 104 105 for (int i=0; i<MAX_THREADS_COUNT; i++) { 106 threads[i].stopRunning(); 107 } 108 109 System.out.println("Done"); 110 } 111 112 private static class TestThread extends Thread { 113 114 volatile boolean isRunning = true; 115 run()116 public void run() { 117 while (isRunning == true) { 118 try { 119 Thread.sleep(10); 120 } catch (Throwable t) { 121 } 122 } 123 } 124 stopRunning()125 public void stopRunning() { 126 isRunning = false; 127 } 128 } 129 } 130 } 131