113 lines
4.0 KiB
Java
113 lines
4.0 KiB
Java
/*
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* Copyright (c) 2002, 2016, 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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import java.nio.ByteBuffer;
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import java.util.Properties;
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public class LimitDirectMemory {
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private static final int K = 1024;
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public static void main(String [] args) throws Exception {
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if (args.length < 2)
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throw new RuntimeException();
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boolean throwp = parseThrow(args[0]);
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int size = parseSize(args[1]);
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int incr = (args.length > 2 ? parseSize(args[2]) : size);
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Properties p = System.getProperties();
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if (p.getProperty("sun.nio.MaxDirectMemorySize") != null)
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throw new RuntimeException("sun.nio.MaxDirectMemorySize defined");
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ByteBuffer [] b = new ByteBuffer[K];
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// Fill up most/all of the direct memory
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int i = 0;
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while (size >= incr) {
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b[i++] = ByteBuffer.allocateDirect(incr);
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size -= incr;
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}
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if (throwp) {
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try {
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b[i] = ByteBuffer.allocateDirect(incr);
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throw new RuntimeException("OutOfMemoryError not thrown: "
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+ incr);
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} catch (OutOfMemoryError e) {
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e.printStackTrace(System.out);
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System.out.println("OK - Error thrown as expected ");
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}
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} else {
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b[i] = ByteBuffer.allocateDirect(incr);
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System.out.println("OK - Error not thrown");
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}
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}
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private static boolean parseThrow(String s) {
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if (s.equals("true")) return true;
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if (s.equals("false")) return false;
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throw new RuntimeException("Unrecognized expectation: " + s);
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}
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private static int parseSize(String size) throws Exception {
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if (size.equals("DEFAULT"))
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return (int)Runtime.getRuntime().maxMemory();
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if (size.equals("DEFAULT+1"))
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return (int)Runtime.getRuntime().maxMemory() + 1;
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if (size.equals("DEFAULT+1M"))
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return (int)Runtime.getRuntime().maxMemory() + (1 << 20);
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if (size.equals("DEFAULT-1"))
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return (int)Runtime.getRuntime().maxMemory() - 1;
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if (size.equals("DEFAULT/2"))
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return (int)Runtime.getRuntime().maxMemory() / 2;
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int idx = 0, len = size.length();
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for (int i = 0; i < len; i++) {
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if (Character.isDigit(size.charAt(i))) idx++;
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else break;
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}
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if (idx == 0)
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throw new RuntimeException("No digits detected: " + size);
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int result = Integer.parseInt(size.substring(0, idx));
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if (idx < len) {
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for (int i = idx; i < len; i++) {
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switch(size.charAt(i)) {
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case 'T': case 't': result *= K; // fall through
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case 'G': case 'g': result *= K; // fall through
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case 'M': case 'm': result *= K; // fall through
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case 'K': case 'k': result *= K;
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break;
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default:
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throw new RuntimeException("Unrecognized size: " + size);
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}
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}
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}
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return result;
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}
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}
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