64 lines
2.3 KiB
Java
64 lines
2.3 KiB
Java
/*
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* Copyright (c) 2023, 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.z;
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/*
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* @test TestNoUncommit
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* @requires vm.gc.Z & !vm.graal.enabled
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* @summary Test ZGC uncommit unused memory disabled
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* @run main/othervm -XX:+UseZGC -Xlog:gc*,gc+heap=debug,gc+stats=off -Xms512M -Xmx512M -XX:ZUncommitDelay=1 gc.z.TestNoUncommit
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* @run main/othervm -XX:+UseZGC -Xlog:gc*,gc+heap=debug,gc+stats=off -Xms128M -Xmx512M -XX:ZUncommitDelay=1 -XX:-ZUncommit gc.z.TestNoUncommit
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*/
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public class TestNoUncommit {
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private static final int allocSize = 200 * 1024 * 1024; // 200M
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private static volatile Object keepAlive = null;
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private static long capacity() {
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return Runtime.getRuntime().totalMemory();
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}
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public static void main(String[] args) throws Exception {
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System.out.println("Allocating");
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keepAlive = new byte[allocSize];
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final var afterAlloc = capacity();
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System.out.println("Reclaiming");
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keepAlive = null;
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System.gc();
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// Wait longer than the uncommit delay (which is 1 second)
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Thread.sleep(5 * 1000);
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final var afterDelay = capacity();
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// Verify
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if (afterAlloc > afterDelay) {
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throw new Exception("Should not uncommit");
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}
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System.out.println("Success");
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}
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}
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