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