Wed, 27 Aug 2014 08:19:12 -0400
8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill
1 /*
2 * Copyright (c) 2014, 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 */
24 import sun.hotspot.WhiteBox;
26 class AllocateBeyondMetaspaceSize {
27 public static Object dummy;
29 public static void main(String [] args) {
30 if (args.length != 2) {
31 throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>");
32 }
34 long metaspaceSize = Long.parseLong(args[0]);
35 long youngGenSize = Long.parseLong(args[1]);
37 run(metaspaceSize, youngGenSize);
38 }
40 private static void run(long metaspaceSize, long youngGenSize) {
41 WhiteBox wb = WhiteBox.getWhiteBox();
43 long allocationBeyondMetaspaceSize = metaspaceSize * 2;
44 long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);
46 triggerYoungGC(youngGenSize);
48 wb.freeMetaspace(null, metaspace, metaspace);
49 }
51 private static void triggerYoungGC(long youngGenSize) {
52 long approxAllocSize = 32 * 1024;
53 long numAllocations = 2 * youngGenSize / approxAllocSize;
55 for (long i = 0; i < numAllocations; i++) {
56 dummy = new byte[(int)approxAllocSize];
57 }
58 }
59 }