137 lines
4.4 KiB
Java
137 lines
4.4 KiB
Java
/*
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* Copyright (c) 2019, 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 TestUncommit
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* @requires vm.gc.Z
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* @summary Test ZGC uncommit unused memory
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* @library /test/lib
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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
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*/
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import java.util.ArrayList;
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import jdk.test.lib.Utils;
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public class TestUncommit {
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private static final int delay = 10 * 1000; // milliseconds
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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 final long startTime = System.nanoTime();
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private static void log(String msg) {
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final String elapsedSeconds = String.format("%.3fs", (System.nanoTime() - startTime) / 1_000_000_000.0);
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System.out.println("[" + elapsedSeconds + "] (" + Thread.currentThread().getName() + ") " + msg);
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}
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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(int objectSize) throws Exception {
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final var beforeAlloc = capacity();
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final var timeBeforeAlloc = System.nanoTime();
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// Allocate memory
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log("Allocating");
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allocate(objectSize);
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final var afterAlloc = capacity();
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// Reclaim memory
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log("Reclaiming");
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reclaim();
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log("Waiting for uncommit to start");
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while (capacity() >= afterAlloc) {
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Thread.sleep(1000);
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}
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log("Uncommit started");
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final var timeUncommitStart = System.nanoTime();
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final var actualDelay = (timeUncommitStart - timeBeforeAlloc) / 1_000_000;
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log("Waiting for uncommit to complete");
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while (capacity() > beforeAlloc) {
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Thread.sleep(1000);
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}
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log("Uncommit completed");
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final var afterUncommit = capacity();
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log(" Uncommit Delay: " + delay);
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log(" Object Size: " + objectSize);
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log(" Alloc Size: " + allocSize);
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log(" Before Alloc: " + beforeAlloc);
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log(" After Alloc: " + afterAlloc);
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log(" After Uncommit: " + afterUncommit);
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log(" Actual Uncommit Delay: " + actualDelay);
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// Verify
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if (actualDelay < delay) {
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throw new Exception("Uncommitted too fast");
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}
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if (actualDelay > delay * 2 * Utils.TIMEOUT_FACTOR) {
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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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log("Success");
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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 < 2; i++) {
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log("Iteration " + i);
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test(smallObjectSize);
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test(mediumObjectSize);
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test(largeObjectSize);
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}
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}
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}
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