1 /*

     2  * Copyright (c) 2002, 2017, 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  * @bug 4627316 6743526

    27  * @summary Test option to limit direct memory allocation

    28  * @requires (os.arch == "x86_64") | (os.arch == "amd64") | (os.arch == "sparcv9")

    29  * @library /test/lib

    30  *

    31  * @summary Test: memory is properly limited using multiple buffers

    32  * @run main/othervm -XX:MaxDirectMemorySize=10 LimitDirectMemory true 10 1

    33  * @run main/othervm -XX:MaxDirectMemorySize=1k LimitDirectMemory true 1k 100

    34  * @run main/othervm -XX:MaxDirectMemorySize=10m LimitDirectMemory true 10m 10m

    35  *

    36  * @summary Test: We can increase the amount of available memory

    37  * @run main/othervm -XX:MaxDirectMemorySize=65M LimitDirectMemory false 64M 65M

    38  *

    39  * @summary Test: Exactly the default amount of memory is available

    40  * @run main/othervm LimitDirectMemory false 10 1

    41  * @run main/othervm -Xmx64m LimitDirectMemory false 0 DEFAULT

    42  * @run main/othervm -Xmx64m LimitDirectMemory true 0 DEFAULT+1

    43  *

    44  * @summary Test: We should be able to eliminate direct memory allocation entirely

    45  * @run main/othervm -XX:MaxDirectMemorySize=0 LimitDirectMemory true 0 1

    46  *

    47  * @summary Test: Setting the system property should not work so we should be able

    48  *                to allocate the default amount

    49  * @run main/othervm -Dsun.nio.MaxDirectMemorySize=1K -Xmx64m

    50  *                   LimitDirectMemory false DEFAULT-1 DEFAULT/2

    51  */

    52 

    53 import java.nio.ByteBuffer;

    54 import java.util.Properties;

    55 

    56 public class LimitDirectMemory {

    57     private static final int K = 1024;

    58 

    59     public static void main(String [] args) throws Exception {

    60         if (args.length < 2) {

    61             throw new IllegalArgumentException("Usage: "

    62                     + "java LimitDirectMemory"

    63                     + " <OOME_expected(true|false)>"

    64                     + " <fill_direct_memory>"

    65                     + " <size_per_buffer>");

    66         }

    67         boolean throwp = parseThrow(args[0]);

    68         int size = parseSize(args[1]);

    69         int incr = (args.length > 2 ? parseSize(args[2]) : size);

    70 

    71         Properties p = System.getProperties();

    72         if (p.getProperty("sun.nio.MaxDirectMemorySize") != null)

    73             throw new RuntimeException("sun.nio.MaxDirectMemorySize defined");

    74 

    75         ByteBuffer [] b = new ByteBuffer[K];

    76 

    77         // Fill up most/all of the direct memory

    78         int i = 0;

    79         while (size >= incr) {

    80             b[i++] = ByteBuffer.allocateDirect(incr);

    81             size -= incr;

    82         }

    83 

    84         if (throwp) {

    85             try {

    86                 b[i] = ByteBuffer.allocateDirect(incr);

    87                 throw new RuntimeException("OutOfMemoryError not thrown: "

    88                                            + incr);

    89             } catch (OutOfMemoryError e) {

    90                 e.printStackTrace(System.out);

    91                 System.out.println("OK - Error thrown as expected ");

    92             }

    93         } else {

    94             b[i] = ByteBuffer.allocateDirect(incr);

    95             System.out.println("OK - Error not thrown");

    96         }

    97     }

    98 

    99     private static boolean parseThrow(String s) {

   100         if (s.equals("true"))  return true;

   101         if (s.equals("false")) return false;

   102         throw new RuntimeException("Unrecognized expectation: " + s);

   103     }

   104 

   105     private static int parseSize(String size) throws Exception {

   106 

   107         if (size.equals("DEFAULT"))

   108             return (int)Runtime.getRuntime().maxMemory();

   109         if (size.equals("DEFAULT+1"))

   110             return (int)Runtime.getRuntime().maxMemory() + 1;

   111         if (size.equals("DEFAULT+1M"))

   112             return (int)Runtime.getRuntime().maxMemory() + (1 << 20);

   113         if (size.equals("DEFAULT-1"))

   114             return (int)Runtime.getRuntime().maxMemory() - 1;

   115         if (size.equals("DEFAULT/2"))

   116             return (int)Runtime.getRuntime().maxMemory() / 2;

   117 

   118         int idx = 0, len = size.length();

   119 

   120 

   121         for (int i = 0; i < len; i++) {

   122             if (Character.isDigit(size.charAt(i))) idx++;

   123             else break;

   124         }

   125 

   126         if (idx == 0)

   127             throw new RuntimeException("No digits detected: " + size);

   128 

   129         int result = Integer.parseInt(size.substring(0, idx));

   130 

   131         if (idx < len) {

   132             for (int i = idx; i < len; i++) {

   133                 switch(size.charAt(i)) {

   134                 case 'T': case 't': result *= K; // fall through

   135                 case 'G': case 'g': result *= K; // fall through

   136                 case 'M': case 'm': result *= K; // fall through

   137                 case 'K': case 'k': result *= K;

   138                     break;

   139                 default:

   140                     throw new RuntimeException("Unrecognized size: " + size);

   141                 }

   142             }

   143         }

   144         return result;

   145     }

   146 }