122 lines
4.3 KiB
Java
122 lines
4.3 KiB
Java
/*
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* Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @key stress randomness
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*
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* @summary converted from VM Testbase gc/memory/FillingStation.
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* VM Testbase keywords: [gc, stress, nonconcurrent]
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*
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* @library /vmTestbase
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* /test/lib
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* @run main/othervm gc.memory.FillingStation.FillingStation
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*/
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package gc.memory.FillingStation;
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import jdk.test.lib.Utils;
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import java.util.Random;
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public class FillingStation {
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public static final long minObjectSize = 4;
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public static final long freeSpaceLimit = 64;
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public static final long maxObjectSize = 32*1024;
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public static final boolean debug = false;
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public static void main(String[] arg) {
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prologue();
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fill();
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epilogue();
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}
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public static void prologue() {
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_beforeMillis = System.currentTimeMillis();
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}
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public static void epilogue() {
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_afterMillis = System.currentTimeMillis();
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if (_overflow) {
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System.out.println("Overflowed!");
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}
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final double deltaSecs = (_afterMillis - _beforeMillis) / 1000.0;
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final double freeMegs = ((double) _freeBytes) / (1024.0 * 1024.0);
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final double totalMegs = ((double) _totalBytes) / (1024.0 * 1024.0);
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final double memRatio = freeMegs / totalMegs;
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System.out.println("Runtime.freeMemory()/Runtime.totalMemory: " +
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Long.toString(_freeBytes) +
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"/" +
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Long.toString(_totalBytes) +
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" = " +
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Double.toString(memRatio));
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System.out.println("That took: " +
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Double.toString(deltaSecs) +
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" seconds");
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}
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public static void fill() {
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boolean _overflow = false;
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Runtime rt = java.lang.Runtime.getRuntime();
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Random stream = Utils.getRandomInstance();
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Space next = null;
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try {
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for (long available = rt.freeMemory();
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available > freeSpaceLimit;
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available = rt.freeMemory()) {
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long request = (available - freeSpaceLimit) / 2;
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int maxRequest = (int) Math.min(maxObjectSize, request);
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int minRequest = (int) Math.max(minObjectSize, maxRequest);
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int size = stream.nextInt(minRequest);
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if (debug) {
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System.err.println("available: " + Long.toString(available) +
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" maxRequest: " + Integer.toString(maxRequest) +
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" minRequest: " + Integer.toString(minRequest) +
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" size: " + Integer.toString(size));
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}
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next = new Space(size, next);
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}
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} catch (OutOfMemoryError oome) {
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_overflow = true;
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}
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_freeBytes = rt.freeMemory();
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_totalBytes = rt.totalMemory();
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}
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static long _beforeMillis = 0L;
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static long _afterMillis = 0L;
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static long _freeBytes = 0L;
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static long _totalBytes = 0L;
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static boolean _overflow = false;
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}
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class Space {
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public Space(int bytes, Space next) {
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_next = next;
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_space = new byte[bytes];
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}
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private Space _next = null;
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private byte[] _space = null;
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}
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