--- a/hotspot/test/stress/gc/TestMultiThreadStressRSet.java Mon Apr 25 18:07:45 2016 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,305 +0,0 @@
-/*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-import java.io.PrintStream;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-import java.util.Random;
-import sun.hotspot.WhiteBox;
-
-/*
- * @test TestMultiThreadStressRSet.java
- * @key stress
- * @requires vm.gc=="G1" | vm.gc=="null"
- * @requires os.maxMemory > 2G
- *
- * @summary Stress G1 Remembered Set using multiple threads
- * @library /test/lib /testlibrary
- * @build sun.hotspot.WhiteBox
- * @run main ClassFileInstaller sun.hotspot.WhiteBox
- * sun.hotspot.WhiteBox$WhiteBoxPermission
- * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
- * -XX:+UseG1GC -XX:G1SummarizeRSetStatsPeriod=1 -Xlog:gc
- * -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestMultiThreadStressRSet 10 4
- *
- * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
- * -XX:+UseG1GC -XX:G1SummarizeRSetStatsPeriod=100 -Xlog:gc
- * -Xmx1G -XX:G1HeapRegionSize=8m -XX:MaxGCPauseMillis=1000 TestMultiThreadStressRSet 60 16
- *
- * @run main/othervm/timeout=700 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
- * -XX:+UseG1GC -XX:G1SummarizeRSetStatsPeriod=100 -Xlog:gc
- * -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestMultiThreadStressRSet 600 32
- */
-public class TestMultiThreadStressRSet {
-
- private static final Random RND = new Random(2015 * 2016);
- private static final WhiteBox WB = WhiteBox.getWhiteBox();
- private static final int REF_SIZE = WB.getHeapOopSize();
- private static final int REGION_SIZE = WB.g1RegionSize();
-
- // How many regions to use for the storage
- private static final int STORAGE_REGIONS = 20;
-
- // Size a single obj in the storage
- private static final int OBJ_SIZE = 1024;
-
- // How many regions of young/old gen to use in the BUFFER
- private static final int BUFFER_YOUNG_REGIONS = 60;
- private static final int BUFFER_OLD_REGIONS = 40;
-
- // Total number of objects in the storage.
- private final int N;
-
- // The storage of byte[]
- private final List<Object> STORAGE;
-
- // Where references to the Storage will be stored
- private final List<Object[]> BUFFER;
-
- // The length of a buffer element.
- // RSet deals with "cards" (areas of 512 bytes), not with single refs
- // So, to affect the RSet the BUFFER refs should be allocated in different
- // memory cards.
- private final int BUF_ARR_LEN = 100 * (512 / REF_SIZE);
-
- // Total number of objects in the young/old buffers
- private final int YOUNG;
- private final int OLD;
-
- // To cause Remembered Sets change their coarse level the test uses a window
- // within STORAGE. All the BUFFER elements refer to only STORAGE objects
- // from the current window. The window is defined by a range.
- // The first element has got the index: 'windowStart',
- // the last one: 'windowStart + windowSize - 1'
- // The window is shifting periodically.
- private int windowStart;
- private final int windowSize;
-
- // Counter of created worker threads
- private int counter = 0;
-
- private volatile String errorMessage = null;
- private volatile boolean isEnough = false;
-
- public static void main(String args[]) {
- if (args.length != 2) {
- throw new IllegalArgumentException("TEST BUG: wrong arg count " + args.length);
- }
- long time = Long.parseLong(args[0]);
- int threads = Integer.parseInt(args[1]);
- new TestMultiThreadStressRSet().test(time * 1000, threads);
- }
-
- /**
- * Initiates test parameters, fills out the STORAGE and BUFFER.
- */
- public TestMultiThreadStressRSet() {
-
- N = (REGION_SIZE - 1) * STORAGE_REGIONS / OBJ_SIZE + 1;
- STORAGE = new ArrayList<>(N);
- int bytes = OBJ_SIZE - 20;
- for (int i = 0; i < N - 1; i++) {
- STORAGE.add(new byte[bytes]);
- }
- STORAGE.add(new byte[REGION_SIZE / 2 + 100]); // humongous
- windowStart = 0;
- windowSize = REGION_SIZE / OBJ_SIZE;
-
- BUFFER = new ArrayList<>();
- int sizeOfBufferObject = 20 + REF_SIZE * BUF_ARR_LEN;
- OLD = REGION_SIZE * BUFFER_OLD_REGIONS / sizeOfBufferObject;
- YOUNG = REGION_SIZE * BUFFER_YOUNG_REGIONS / sizeOfBufferObject;
- for (int i = 0; i < OLD + YOUNG; i++) {
- BUFFER.add(new Object[BUF_ARR_LEN]);
- }
- }
-
- /**
- * Does the testing. Steps:
- * <ul>
- * <li> starts the Shifter thread
- * <li> during the given time starts new Worker threads, keeping the number
- * of live thread under limit.
- * <li> stops the Shifter thread
- * </ul>
- *
- * @param timeInMillis how long to stress
- * @param maxThreads the maximum number of Worker thread working together.
- */
- public void test(long timeInMillis, int maxThreads) {
- if (timeInMillis <= 0 || maxThreads <= 0) {
- throw new IllegalArgumentException("TEST BUG: be positive!");
- }
- System.out.println("%% Time to work: " + timeInMillis / 1000 + "s");
- System.out.println("%% Number of threads: " + maxThreads);
- long finish = System.currentTimeMillis() + timeInMillis;
- Shifter shift = new Shifter(this, 1000, (int) (windowSize * 0.9));
- shift.start();
- for (int i = 0; i < maxThreads; i++) {
- new Worker(this, 100).start();
- }
- try {
- while (System.currentTimeMillis() < finish && errorMessage == null) {
- Thread.sleep(100);
- }
- } catch (Throwable t) {
- printAllStackTraces(System.err);
- t.printStackTrace(System.err);
- this.errorMessage = t.getMessage();
- } finally {
- isEnough = true;
- }
- System.out.println("%% Total work cycles: " + counter);
- if (errorMessage != null) {
- throw new RuntimeException(errorMessage);
- }
- }
-
- /**
- * Returns an element from from the BUFFER (an object array) to keep
- * references to the storage.
- *
- * @return an Object[] from buffer.
- */
- private Object[] getFromBuffer() {
- int index = counter % (OLD + YOUNG);
- synchronized (BUFFER) {
- if (index < OLD) {
- if (counter % 100 == (counter / 100) % 100) {
- // need to generate garbage in the old gen to provoke mixed GC
- return replaceInBuffer(index);
- } else {
- return BUFFER.get(index);
- }
- } else {
- return replaceInBuffer(index);
- }
- }
- }
-
- private Object[] replaceInBuffer(int index) {
- Object[] objs = new Object[BUF_ARR_LEN];
- BUFFER.set(index, objs);
- return objs;
- }
-
- /**
- * Returns a random object from the current window within the storage.
- * A storage element with index from windowStart to windowStart+windowSize.
- *
- * @return a random element from the current window within the storage.
- */
- private Object getRandomObject() {
- int index = (windowStart + RND.nextInt(windowSize)) % N;
- return STORAGE.get(index);
- }
-
- private static void printAllStackTraces(PrintStream ps) {
- Map<Thread, StackTraceElement[]> traces = Thread.getAllStackTraces();
- for (Thread t : traces.keySet()) {
- ps.println(t.toString() + " " + t.getState());
- for (StackTraceElement traceElement : traces.get(t)) {
- ps.println("\tat " + traceElement);
- }
- }
- }
-
- /**
- * Thread to create a number of references from BUFFER to STORAGE.
- */
- private static class Worker extends Thread {
-
- final TestMultiThreadStressRSet boss;
- final int refs; // number of refs to OldGen
-
- /**
- * @param boss the tests
- * @param refsToOldGen how many references to the OldGen to create
- */
- Worker(TestMultiThreadStressRSet boss, int refsToOldGen) {
- this.boss = boss;
- this.refs = refsToOldGen;
- }
-
- @Override
- public void run() {
- try {
- while (!boss.isEnough) {
- Object[] objs = boss.getFromBuffer();
- int step = objs.length / refs;
- for (int i = 0; i < refs; i += step) {
- objs[i] = boss.getRandomObject();
- }
- boss.counter++;
- }
- } catch (Throwable t) {
- t.printStackTrace(System.out);
- boss.errorMessage = t.getMessage();
- }
- }
- }
-
- /**
- * Periodically shifts the current STORAGE window, removing references
- * in BUFFER that refer to objects outside the window.
- */
- private static class Shifter extends Thread {
-
- final TestMultiThreadStressRSet boss;
- final int sleepTime;
- final int shift;
-
- Shifter(TestMultiThreadStressRSet boss, int sleepTime, int shift) {
- this.boss = boss;
- this.sleepTime = sleepTime;
- this.shift = shift;
- }
-
- @Override
- public void run() {
- try {
- while (!boss.isEnough) {
- Thread.sleep(sleepTime);
- boss.windowStart += shift;
- for (int i = 0; i < boss.OLD; i++) {
- Object[] objs = boss.BUFFER.get(i);
- for (int j = 0; j < objs.length; j++) {
- objs[j] = null;
- }
- }
- if (!WB.g1InConcurrentMark()) {
- System.out.println("%% start CMC");
- WB.g1StartConcMarkCycle();
- } else {
- System.out.println("%% CMC is already in progress");
- }
- }
- } catch (Throwable t) {
- t.printStackTrace(System.out);
- boss.errorMessage = t.getMessage();
- }
- }
- }
-}
-