| /* |
| * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @key stress gc |
| * |
| * @summary converted from VM Testbase gc/memory/FillingStation. |
| * VM Testbase keywords: [gc, stress, nonconcurrent] |
| * |
| * @library /vmTestbase |
| * /test/lib |
| * @run driver jdk.test.lib.FileInstaller . . |
| * @run main/othervm gc.memory.FillingStation.FillingStation |
| */ |
| |
| package gc.memory.FillingStation; |
| |
| public class FillingStation { |
| |
| public static final long minObjectSize = 4; |
| public static final long freeSpaceLimit = 64; |
| public static final long maxObjectSize = 32*1024; |
| |
| public static final boolean debug = false; |
| |
| public static void main(String[] arg) { |
| prologue(); |
| fill(); |
| epilogue(); |
| } |
| |
| public static void prologue() { |
| _beforeMillis = System.currentTimeMillis(); |
| } |
| |
| public static void epilogue() { |
| _afterMillis = System.currentTimeMillis(); |
| if (_overflow) { |
| System.out.println("Overflowed!"); |
| } |
| final double deltaSecs = (_afterMillis - _beforeMillis) / 1000.0; |
| final double freeMegs = ((double) _freeBytes) / (1024.0 * 1024.0); |
| final double totalMegs = ((double) _totalBytes) / (1024.0 * 1024.0); |
| final double memRatio = freeMegs / totalMegs; |
| System.out.println("Runtime.freeMemory()/Runtime.totalMemory: " + |
| Long.toString(_freeBytes) + |
| "/" + |
| Long.toString(_totalBytes) + |
| " = " + |
| Double.toString(memRatio)); |
| System.out.println("That took: " + |
| Double.toString(deltaSecs) + |
| " seconds"); |
| } |
| |
| public static void fill() { |
| boolean _overflow = false; |
| Runtime rt = java.lang.Runtime.getRuntime(); |
| java.util.Random stream = new java.util.Random(); |
| Space next = null; |
| try { |
| for (long available = rt.freeMemory(); |
| available > freeSpaceLimit; |
| available = rt.freeMemory()) { |
| long request = (available - freeSpaceLimit) / 2; |
| int maxRequest = (int) Math.min(maxObjectSize, request); |
| int minRequest = (int) Math.max(minObjectSize, maxRequest); |
| int size = stream.nextInt(minRequest); |
| if (debug) { |
| System.err.println("available: " + Long.toString(available) + |
| " maxRequest: " + Integer.toString(maxRequest) + |
| " minRequest: " + Integer.toString(minRequest) + |
| " size: " + Integer.toString(size)); |
| } |
| next = new Space(size, next); |
| } |
| } catch (OutOfMemoryError oome) { |
| _overflow = true; |
| } |
| _freeBytes = rt.freeMemory(); |
| _totalBytes = rt.totalMemory(); |
| } |
| |
| static long _beforeMillis = 0L; |
| static long _afterMillis = 0L; |
| static long _freeBytes = 0L; |
| static long _totalBytes = 0L; |
| static boolean _overflow = false; |
| } |
| |
| class Space { |
| public Space(int bytes, Space next) { |
| _next = next; |
| _space = new byte[bytes]; |
| } |
| private Space _next = null; |
| private byte[] _space = null; |
| } |