1 /*
2 * Copyright (c) 2002, 2018, 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 * @key stress gc
27 *
28 * @summary converted from VM Testbase gc/memory/FillingStation.
29 * VM Testbase keywords: [gc, stress, nonconcurrent]
30 *
31 * @library /vmTestbase
32 * /test/lib
33 * @run driver jdk.test.lib.FileInstaller . .
34 * @run main/othervm gc.memory.FillingStation.FillingStation
35 */
36
37 package gc.memory.FillingStation;
38
39 import jdk.test.lib.Utils;
40 import java.util.Random;
41
42 public class FillingStation {
43
44 public static final long minObjectSize = 4;
45 public static final long freeSpaceLimit = 64;
46 public static final long maxObjectSize = 32*1024;
47
48 public static final boolean debug = false;
49
50 public static void main(String[] arg) {
51 prologue();
52 fill();
53 epilogue();
54 }
55
56 public static void prologue() {
57 _beforeMillis = System.currentTimeMillis();
58 }
59
60 public static void epilogue() {
61 _afterMillis = System.currentTimeMillis();
62 if (_overflow) {
63 System.out.println("Overflowed!");
64 }
65 final double deltaSecs = (_afterMillis - _beforeMillis) / 1000.0;
66 final double freeMegs = ((double) _freeBytes) / (1024.0 * 1024.0);
67 final double totalMegs = ((double) _totalBytes) / (1024.0 * 1024.0);
68 final double memRatio = freeMegs / totalMegs;
69 System.out.println("Runtime.freeMemory()/Runtime.totalMemory: " +
70 Long.toString(_freeBytes) +
71 "/" +
72 Long.toString(_totalBytes) +
73 " = " +
74 Double.toString(memRatio));
75 System.out.println("That took: " +
76 Double.toString(deltaSecs) +
77 " seconds");
78 }
79
80 public static void fill() {
81 boolean _overflow = false;
82 Runtime rt = java.lang.Runtime.getRuntime();
83 Random stream = Utils.getRandomInstance();
84 Space next = null;
85 try {
86 for (long available = rt.freeMemory();
87 available > freeSpaceLimit;
88 available = rt.freeMemory()) {
89 long request = (available - freeSpaceLimit) / 2;
90 int maxRequest = (int) Math.min(maxObjectSize, request);
91 int minRequest = (int) Math.max(minObjectSize, maxRequest);
92 int size = stream.nextInt(minRequest);
93 if (debug) {
94 System.err.println("available: " + Long.toString(available) +
95 " maxRequest: " + Integer.toString(maxRequest) +
96 " minRequest: " + Integer.toString(minRequest) +
97 " size: " + Integer.toString(size));
98 }
99 next = new Space(size, next);
100 }
101 } catch (OutOfMemoryError oome) {
102 _overflow = true;
103 }
104 _freeBytes = rt.freeMemory();
105 _totalBytes = rt.totalMemory();
106 }
107
108 static long _beforeMillis = 0L;
109 static long _afterMillis = 0L;
110 static long _freeBytes = 0L;
111 static long _totalBytes = 0L;
112 static boolean _overflow = false;
113 }
114
115 class Space {
116 public Space(int bytes, Space next) {
117 _next = next;
118 _space = new byte[bytes];
119 }
120 private Space _next = null;
121 private byte[] _space = null;
122 }