130 lines
4.6 KiB
Java
130 lines
4.6 KiB
Java
/*
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* Copyright (c) 2019, 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.z;
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/*
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* @test TestUncommit
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* @requires vm.gc.Z & !vm.graal.enabled
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* @summary Test ZGC uncommit unused memory
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* @run main/othervm -XX:+UseZGC -Xlog:gc*,gc+heap=debug,gc+stats=off -Xms128M -Xmx512M -XX:ZUncommitDelay=10 gc.z.TestUncommit true 2
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* @run main/othervm -XX:+UseZGC -Xlog:gc*,gc+heap=debug,gc+stats=off -Xms512M -Xmx512M -XX:ZUncommitDelay=10 gc.z.TestUncommit false 1
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* @run main/othervm -XX:+UseZGC -Xlog:gc*,gc+heap=debug,gc+stats=off -Xms128M -Xmx512M -XX:ZUncommitDelay=10 -XX:-ZUncommit gc.z.TestUncommit false 1
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*/
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import java.util.ArrayList;
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public class TestUncommit {
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private static final int delay = 10; // seconds
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private static final int allocSize = 200 * 1024 * 1024; // 200M
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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 final int largeObjectSize = allocSize;
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private static volatile ArrayList<byte[]> keepAlive;
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private static long capacity() {
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return Runtime.getRuntime().totalMemory();
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}
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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 reclaim() {
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keepAlive = null;
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System.gc();
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}
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private static void test(boolean enabled, int objectSize) throws Exception {
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final var beforeAlloc = capacity();
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// Allocate memory
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allocate(objectSize);
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final var afterAlloc = capacity();
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// Reclaim memory
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reclaim();
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// Wait shorter than the uncommit delay
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Thread.sleep(delay * 1000 / 2);
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final var beforeUncommit = capacity();
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// Wait longer than the uncommit delay
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Thread.sleep(delay * 1000);
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final var afterUncommit = capacity();
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System.out.println(" Uncommit Enabled: " + enabled);
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System.out.println(" Uncommit Delay: " + delay);
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System.out.println(" Object Size: " + objectSize);
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System.out.println(" Alloc Size: " + allocSize);
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System.out.println(" Before Alloc: " + beforeAlloc);
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System.out.println(" After Alloc: " + afterAlloc);
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System.out.println(" Before Uncommit: " + beforeUncommit);
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System.out.println(" After Uncommit: " + afterUncommit);
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System.out.println();
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// Verify
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if (enabled) {
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if (beforeUncommit == beforeAlloc) {
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throw new Exception("Uncommitted too fast");
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}
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if (afterUncommit >= afterAlloc) {
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throw new Exception("Uncommitted too slow");
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}
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if (afterUncommit < beforeAlloc) {
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throw new Exception("Uncommitted too much");
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}
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if (afterUncommit > beforeAlloc) {
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throw new Exception("Uncommitted too little");
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}
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} else {
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if (afterAlloc > beforeUncommit ||
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afterAlloc > afterUncommit) {
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throw new Exception("Should not uncommit");
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}
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}
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}
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public static void main(String[] args) throws Exception {
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final boolean enabled = Boolean.parseBoolean(args[0]);
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final int iterations = Integer.parseInt(args[1]);
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for (int i = 0; i < iterations; i++) {
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System.out.println("Iteration " + i);
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test(enabled, smallObjectSize);
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test(enabled, mediumObjectSize);
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test(enabled, largeObjectSize);
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}
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}
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}
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