60 lines
2.0 KiB
Java
60 lines
2.0 KiB
Java
/*
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* Copyright (c) 2014, 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 sun.hotspot.WhiteBox;
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class AllocateBeyondMetaspaceSize {
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public static Object dummy;
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public static void main(String [] args) {
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if (args.length != 2) {
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throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>");
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}
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long metaspaceSize = Long.parseLong(args[0]);
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long youngGenSize = Long.parseLong(args[1]);
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run(metaspaceSize, youngGenSize);
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}
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private static void run(long metaspaceSize, long youngGenSize) {
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WhiteBox wb = WhiteBox.getWhiteBox();
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long allocationBeyondMetaspaceSize = metaspaceSize * 2;
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long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);
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triggerYoungGC(youngGenSize);
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wb.freeMetaspace(null, metaspace, metaspace);
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}
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private static void triggerYoungGC(long youngGenSize) {
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long approxAllocSize = 32 * 1024;
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long numAllocations = 2 * youngGenSize / approxAllocSize;
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for (long i = 0; i < numAllocations; i++) {
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dummy = new byte[(int)approxAllocSize];
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}
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}
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}
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