46 lines
1.9 KiB
Java
46 lines
1.9 KiB
Java
/*
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* Copyright (c) 2016, 2020, 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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package gc.g1;
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/*
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* @test
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* @bug 8169703
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* @summary Regression test to ensure AlwaysPreTouch with multiple threads works at mutator time.
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* Allocates a few humongous objects that will be allocated by expanding the heap, causing concurrent parallel
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* pre-touch.
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* @requires vm.gc.G1
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* @run main/othervm -XX:+UseG1GC -Xms10M -Xmx100m -XX:G1HeapRegionSize=1M -XX:+AlwaysPreTouch -XX:PreTouchParallelChunkSize=512k -Xlog:gc+ergo+heap=debug,gc+heap=debug,gc=debug gc.g1.TestParallelAlwaysPreTouch
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*/
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public class TestParallelAlwaysPreTouch {
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public static void main(String[] args) throws Exception {
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final int M = 1024 * 1024; // Something guaranteed to be larger than a region to be counted as humongous.
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for (int i = 0; i < 10; i++) {
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Object[] obj = new Object[M];
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System.out.println(obj);
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}
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}
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}
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