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8145908: [Newtest] Multi-threading stress test for G1 Remembered Sets
Reviewed-by: tschatzl, mchernov
This commit is contained in:
Dmitry Fazunenko
parent
a956d2a0a0
commit
f077709652
305
hotspot/test/stress/gc/TestMultiThreadStressRSet.java
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305
hotspot/test/stress/gc/TestMultiThreadStressRSet.java
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/*
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* Copyright (c) 2016, 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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import java.io.PrintStream;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.Random;
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import sun.hotspot.WhiteBox;
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/*
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* @test TestMultiThreadStressRSet.java
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* @key stress
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* @requires vm.gc=="G1" | vm.gc=="null"
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* @requires os.maxMemory > 2G
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*
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* @summary Stress G1 Remembered Set using multiple threads
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* @library /test/lib /testlibrary
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* @build sun.hotspot.WhiteBox
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* @run main ClassFileInstaller sun.hotspot.WhiteBox
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* sun.hotspot.WhiteBox$WhiteBoxPermission
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* -XX:+UseG1GC -XX:G1SummarizeRSetStatsPeriod=1 -Xlog:gc
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* -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestMultiThreadStressRSet 10 4
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*
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* -XX:+UseG1GC -XX:G1SummarizeRSetStatsPeriod=100 -Xlog:gc
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* -Xmx1G -XX:G1HeapRegionSize=8m -XX:MaxGCPauseMillis=1000 TestMultiThreadStressRSet 60 16
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*
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* @run main/othervm/timeout=700 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* -XX:+UseG1GC -XX:G1SummarizeRSetStatsPeriod=100 -Xlog:gc
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* -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestMultiThreadStressRSet 600 32
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*/
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public class TestMultiThreadStressRSet {
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private static final Random RND = new Random(2015 * 2016);
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private static final int REF_SIZE = WB.getHeapOopSize();
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private static final int REGION_SIZE = WB.g1RegionSize();
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// How many regions to use for the storage
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private static final int STORAGE_REGIONS = 20;
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// Size a single obj in the storage
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private static final int OBJ_SIZE = 1024;
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// How many regions of young/old gen to use in the BUFFER
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private static final int BUFFER_YOUNG_REGIONS = 60;
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private static final int BUFFER_OLD_REGIONS = 40;
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// Total number of objects in the storage.
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private final int N;
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// The storage of byte[]
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private final List<Object> STORAGE;
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// Where references to the Storage will be stored
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private final List<Object[]> BUFFER;
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// The length of a buffer element.
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// RSet deals with "cards" (areas of 512 bytes), not with single refs
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// So, to affect the RSet the BUFFER refs should be allocated in different
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// memory cards.
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private final int BUF_ARR_LEN = 100 * (512 / REF_SIZE);
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// Total number of objects in the young/old buffers
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private final int YOUNG;
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private final int OLD;
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// To cause Remembered Sets change their coarse level the test uses a window
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// within STORAGE. All the BUFFER elements refer to only STORAGE objects
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// from the current window. The window is defined by a range.
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// The first element has got the index: 'windowStart',
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// the last one: 'windowStart + windowSize - 1'
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// The window is shifting periodically.
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private int windowStart;
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private final int windowSize;
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// Counter of created worker threads
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private int counter = 0;
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private volatile String errorMessage = null;
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private volatile boolean isEnough = false;
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public static void main(String args[]) {
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if (args.length != 2) {
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throw new IllegalArgumentException("TEST BUG: wrong arg count " + args.length);
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}
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long time = Long.parseLong(args[0]);
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int threads = Integer.parseInt(args[1]);
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new TestMultiThreadStressRSet().test(time * 1000, threads);
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}
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/**
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* Initiates test parameters, fills out the STORAGE and BUFFER.
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*/
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public TestMultiThreadStressRSet() {
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N = (REGION_SIZE - 1) * STORAGE_REGIONS / OBJ_SIZE + 1;
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STORAGE = new ArrayList<>(N);
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int bytes = OBJ_SIZE - 20;
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for (int i = 0; i < N - 1; i++) {
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STORAGE.add(new byte[bytes]);
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}
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STORAGE.add(new byte[REGION_SIZE / 2 + 100]); // humongous
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windowStart = 0;
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windowSize = REGION_SIZE / OBJ_SIZE;
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BUFFER = new ArrayList<>();
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int sizeOfBufferObject = 20 + REF_SIZE * BUF_ARR_LEN;
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OLD = REGION_SIZE * BUFFER_OLD_REGIONS / sizeOfBufferObject;
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YOUNG = REGION_SIZE * BUFFER_YOUNG_REGIONS / sizeOfBufferObject;
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for (int i = 0; i < OLD + YOUNG; i++) {
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BUFFER.add(new Object[BUF_ARR_LEN]);
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}
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}
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/**
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* Does the testing. Steps:
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* <ul>
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* <li> starts the Shifter thread
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* <li> during the given time starts new Worker threads, keeping the number
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* of live thread under limit.
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* <li> stops the Shifter thread
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* </ul>
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*
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* @param timeInMillis how long to stress
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* @param maxThreads the maximum number of Worker thread working together.
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*/
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public void test(long timeInMillis, int maxThreads) {
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if (timeInMillis <= 0 || maxThreads <= 0) {
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throw new IllegalArgumentException("TEST BUG: be positive!");
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}
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System.out.println("%% Time to work: " + timeInMillis / 1000 + "s");
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System.out.println("%% Number of threads: " + maxThreads);
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long finish = System.currentTimeMillis() + timeInMillis;
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Shifter shift = new Shifter(this, 1000, (int) (windowSize * 0.9));
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shift.start();
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for (int i = 0; i < maxThreads; i++) {
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new Worker(this, 100).start();
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}
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try {
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while (System.currentTimeMillis() < finish && errorMessage == null) {
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Thread.sleep(100);
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}
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} catch (Throwable t) {
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printAllStackTraces(System.err);
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t.printStackTrace(System.err);
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this.errorMessage = t.getMessage();
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} finally {
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isEnough = true;
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}
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System.out.println("%% Total work cycles: " + counter);
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if (errorMessage != null) {
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throw new RuntimeException(errorMessage);
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}
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}
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/**
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* Returns an element from from the BUFFER (an object array) to keep
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* references to the storage.
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*
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* @return an Object[] from buffer.
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*/
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private Object[] getFromBuffer() {
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int index = counter % (OLD + YOUNG);
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synchronized (BUFFER) {
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if (index < OLD) {
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if (counter % 100 == (counter / 100) % 100) {
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// need to generate garbage in the old gen to provoke mixed GC
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return replaceInBuffer(index);
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} else {
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return BUFFER.get(index);
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}
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} else {
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return replaceInBuffer(index);
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}
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}
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}
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private Object[] replaceInBuffer(int index) {
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Object[] objs = new Object[BUF_ARR_LEN];
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BUFFER.set(index, objs);
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return objs;
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}
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/**
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* Returns a random object from the current window within the storage.
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* A storage element with index from windowStart to windowStart+windowSize.
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*
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* @return a random element from the current window within the storage.
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*/
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private Object getRandomObject() {
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int index = (windowStart + RND.nextInt(windowSize)) % N;
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return STORAGE.get(index);
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}
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private static void printAllStackTraces(PrintStream ps) {
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Map<Thread, StackTraceElement[]> traces = Thread.getAllStackTraces();
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for (Thread t : traces.keySet()) {
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ps.println(t.toString() + " " + t.getState());
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for (StackTraceElement traceElement : traces.get(t)) {
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ps.println("\tat " + traceElement);
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}
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}
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}
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/**
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* Thread to create a number of references from BUFFER to STORAGE.
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*/
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private static class Worker extends Thread {
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final TestMultiThreadStressRSet boss;
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final int refs; // number of refs to OldGen
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/**
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* @param boss the tests
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* @param refsToOldGen how many references to the OldGen to create
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*/
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Worker(TestMultiThreadStressRSet boss, int refsToOldGen) {
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this.boss = boss;
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this.refs = refsToOldGen;
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}
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@Override
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public void run() {
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try {
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while (!boss.isEnough) {
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Object[] objs = boss.getFromBuffer();
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int step = objs.length / refs;
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for (int i = 0; i < refs; i += step) {
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objs[i] = boss.getRandomObject();
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}
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boss.counter++;
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}
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} catch (Throwable t) {
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t.printStackTrace(System.out);
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boss.errorMessage = t.getMessage();
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}
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}
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}
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/**
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* Periodically shifts the current STORAGE window, removing references
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* in BUFFER that refer to objects outside the window.
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*/
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private static class Shifter extends Thread {
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final TestMultiThreadStressRSet boss;
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final int sleepTime;
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final int shift;
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Shifter(TestMultiThreadStressRSet boss, int sleepTime, int shift) {
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this.boss = boss;
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this.sleepTime = sleepTime;
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this.shift = shift;
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}
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@Override
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public void run() {
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try {
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while (!boss.isEnough) {
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Thread.sleep(sleepTime);
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boss.windowStart += shift;
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for (int i = 0; i < boss.OLD; i++) {
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Object[] objs = boss.BUFFER.get(i);
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for (int j = 0; j < objs.length; j++) {
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objs[j] = null;
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}
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}
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if (!WB.g1InConcurrentMark()) {
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System.out.println("%% start CMC");
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WB.g1StartConcMarkCycle();
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} else {
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System.out.println("%% CMC is already in progress");
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}
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}
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} catch (Throwable t) {
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t.printStackTrace(System.out);
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boss.errorMessage = t.getMessage();
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}
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}
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}
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}
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