75 lines
2.5 KiB
Java
75 lines
2.5 KiB
Java
/*
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* Copyright (c) 2020, 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 TestRelocateInPlace
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* @requires vm.gc.Z
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* @summary Test ZGC in-place relocateion
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* @run main/othervm -XX:+UseZGC -Xlog:gc*,gc+stats=off -Xmx256M -XX:+UnlockDiagnosticVMOptions -XX:+ZStressRelocateInPlace gc.z.TestRelocateInPlace
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*/
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import java.util.ArrayList;
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public class TestRelocateInPlace {
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private static final int allocSize = 100 * 1024 * 1024; // 100M
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private static final int smallObjectSize = 4 * 1024; // 4K
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private static final int mediumObjectSize = 2 * 1024 * 1024; // 2M
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private static volatile ArrayList<byte[]> keepAlive;
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private static void allocate(int objectSize) {
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keepAlive = new ArrayList<>();
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for (int i = 0; i < allocSize; i+= objectSize) {
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keepAlive.add(new byte[objectSize]);
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}
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}
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private static void fragment() {
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// Release every other reference to cause lots of fragmentation
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for (int i = 0; i < keepAlive.size(); i += 2) {
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keepAlive.set(i, null);
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}
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}
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private static void test(int objectSize) throws Exception {
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System.out.println("Allocating");
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allocate(objectSize);
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System.out.println("Fragmenting");
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fragment();
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System.out.println("Reclaiming");
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System.gc();
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}
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public static void main(String[] args) throws Exception {
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for (int i = 0; i < 10; i++) {
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System.out.println("Iteration " + i);
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test(smallObjectSize);
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test(mediumObjectSize);
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}
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}
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}
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