1 /* 2 * Copyright (c) 2002, 2018, 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 26 * @key stress gc 27 * 28 * @summary converted from VM Testbase gc/memory/FillingStation. 29 * VM Testbase keywords: [gc, stress, nonconcurrent] 30 * 31 * @library /vmTestbase 32 * /test/lib 33 * @run driver jdk.test.lib.FileInstaller . . 34 * @run main/othervm gc.memory.FillingStation.FillingStation 35 */ 36 37 package gc.memory.FillingStation; 38 39 public class FillingStation { 40 41 public static final long minObjectSize = 4; 42 public static final long freeSpaceLimit = 64; 43 public static final long maxObjectSize = 32*1024; 44 45 public static final boolean debug = false; 46 47 public static void main(String[] arg) { 48 prologue(); 49 fill(); 50 epilogue(); 51 } 52 53 public static void prologue() { 54 _beforeMillis = System.currentTimeMillis(); 55 } 56 57 public static void epilogue() { 58 _afterMillis = System.currentTimeMillis(); 59 if (_overflow) { 60 System.out.println("Overflowed!"); 61 } 62 final double deltaSecs = (_afterMillis - _beforeMillis) / 1000.0; 63 final double freeMegs = ((double) _freeBytes) / (1024.0 * 1024.0); 64 final double totalMegs = ((double) _totalBytes) / (1024.0 * 1024.0); 65 final double memRatio = freeMegs / totalMegs; 66 System.out.println("Runtime.freeMemory()/Runtime.totalMemory: " + 67 Long.toString(_freeBytes) + 68 "/" + 69 Long.toString(_totalBytes) + 70 " = " + 71 Double.toString(memRatio)); 72 System.out.println("That took: " + 73 Double.toString(deltaSecs) + 74 " seconds"); 75 } 76 77 public static void fill() { 78 boolean _overflow = false; 79 Runtime rt = java.lang.Runtime.getRuntime(); 80 java.util.Random stream = new java.util.Random(); 81 Space next = null; 82 try { 83 for (long available = rt.freeMemory(); 84 available > freeSpaceLimit; 85 available = rt.freeMemory()) { 86 long request = (available - freeSpaceLimit) / 2; 87 int maxRequest = (int) Math.min(maxObjectSize, request); 88 int minRequest = (int) Math.max(minObjectSize, maxRequest); 89 int size = stream.nextInt(minRequest); 90 if (debug) { 91 System.err.println("available: " + Long.toString(available) + 92 " maxRequest: " + Integer.toString(maxRequest) + 93 " minRequest: " + Integer.toString(minRequest) + 94 " size: " + Integer.toString(size)); 95 } 96 next = new Space(size, next); 97 } 98 } catch (OutOfMemoryError oome) { 99 _overflow = true; 100 } 101 _freeBytes = rt.freeMemory(); 102 _totalBytes = rt.totalMemory(); 103 } 104 105 static long _beforeMillis = 0L; 106 static long _afterMillis = 0L; 107 static long _freeBytes = 0L; 108 static long _totalBytes = 0L; 109 static boolean _overflow = false; 110 } 111 112 class Space { 113 public Space(int bytes, Space next) { 114 _next = next; 115 _space = new byte[bytes]; 116 } 117 private Space _next = null; 118 private byte[] _space = null; 119 }