| /* |
| * Copyright (c) 2002, 2017, 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 |
| * @bug 4627316 6743526 |
| * @summary Test option to limit direct memory allocation |
| * @requires (os.arch == "x86_64") | (os.arch == "amd64") | (os.arch == "sparcv9") |
| * @library /test/lib |
| * |
| * @summary Test: memory is properly limited using multiple buffers |
| * @run main/othervm -XX:MaxDirectMemorySize=10 LimitDirectMemory true 10 1 |
| * @run main/othervm -XX:MaxDirectMemorySize=1k LimitDirectMemory true 1k 100 |
| * @run main/othervm -XX:MaxDirectMemorySize=10m LimitDirectMemory true 10m 10m |
| * |
| * @summary Test: We can increase the amount of available memory |
| * @run main/othervm -XX:MaxDirectMemorySize=65M LimitDirectMemory false 64M 65M |
| * |
| * @summary Test: Exactly the default amount of memory is available |
| * @run main/othervm LimitDirectMemory false 10 1 |
| * @run main/othervm -Xmx64m LimitDirectMemory false 0 DEFAULT |
| * @run main/othervm -Xmx64m LimitDirectMemory true 0 DEFAULT+1 |
| * |
| * @summary Test: We should be able to eliminate direct memory allocation entirely |
| * @run main/othervm -XX:MaxDirectMemorySize=0 LimitDirectMemory true 0 1 |
| * |
| * @summary Test: Setting the system property should not work so we should be able |
| * to allocate the default amount |
| * @run main/othervm -Dsun.nio.MaxDirectMemorySize=1K -Xmx64m |
| * LimitDirectMemory false DEFAULT-1 DEFAULT/2 |
| */ |
| |
| import java.nio.ByteBuffer; |
| import java.util.Properties; |
| |
| public class LimitDirectMemory { |
| private static final int K = 1024; |
| |
| public static void main(String [] args) throws Exception { |
| if (args.length < 2) { |
| throw new IllegalArgumentException("Usage: " |
| + "java LimitDirectMemory" |
| + " <OOME_expected(true|false)>" |
| + " <fill_direct_memory>" |
| + " <size_per_buffer>"); |
| } |
| boolean throwp = parseThrow(args[0]); |
| int size = parseSize(args[1]); |
| int incr = (args.length > 2 ? parseSize(args[2]) : size); |
| |
| Properties p = System.getProperties(); |
| if (p.getProperty("sun.nio.MaxDirectMemorySize") != null) |
| throw new RuntimeException("sun.nio.MaxDirectMemorySize defined"); |
| |
| ByteBuffer [] b = new ByteBuffer[K]; |
| |
| // Fill up most/all of the direct memory |
| int i = 0; |
| while (size >= incr) { |
| b[i++] = ByteBuffer.allocateDirect(incr); |
| size -= incr; |
| } |
| |
| if (throwp) { |
| try { |
| b[i] = ByteBuffer.allocateDirect(incr); |
| throw new RuntimeException("OutOfMemoryError not thrown: " |
| + incr); |
| } catch (OutOfMemoryError e) { |
| e.printStackTrace(System.out); |
| System.out.println("OK - Error thrown as expected "); |
| } |
| } else { |
| b[i] = ByteBuffer.allocateDirect(incr); |
| System.out.println("OK - Error not thrown"); |
| } |
| } |
| |
| private static boolean parseThrow(String s) { |
| if (s.equals("true")) return true; |
| if (s.equals("false")) return false; |
| throw new RuntimeException("Unrecognized expectation: " + s); |
| } |
| |
| private static int parseSize(String size) throws Exception { |
| |
| if (size.equals("DEFAULT")) |
| return (int)Runtime.getRuntime().maxMemory(); |
| if (size.equals("DEFAULT+1")) |
| return (int)Runtime.getRuntime().maxMemory() + 1; |
| if (size.equals("DEFAULT+1M")) |
| return (int)Runtime.getRuntime().maxMemory() + (1 << 20); |
| if (size.equals("DEFAULT-1")) |
| return (int)Runtime.getRuntime().maxMemory() - 1; |
| if (size.equals("DEFAULT/2")) |
| return (int)Runtime.getRuntime().maxMemory() / 2; |
| |
| int idx = 0, len = size.length(); |
| |
| |
| for (int i = 0; i < len; i++) { |
| if (Character.isDigit(size.charAt(i))) idx++; |
| else break; |
| } |
| |
| if (idx == 0) |
| throw new RuntimeException("No digits detected: " + size); |
| |
| int result = Integer.parseInt(size.substring(0, idx)); |
| |
| if (idx < len) { |
| for (int i = idx; i < len; i++) { |
| switch(size.charAt(i)) { |
| case 'T': case 't': result *= K; // fall through |
| case 'G': case 'g': result *= K; // fall through |
| case 'M': case 'm': result *= K; // fall through |
| case 'K': case 'k': result *= K; |
| break; |
| default: |
| throw new RuntimeException("Unrecognized size: " + size); |
| } |
| } |
| } |
| return result; |
| } |
| } |