197 lines
7.8 KiB
Java
197 lines
7.8 KiB
Java
/*
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* Copyright (c) 2002, 2018, 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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/*
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* @test
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* @key stress gc
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*
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* @summary converted from VM Testbase gc/gctests/MatrixJuggleGC.
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* VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
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* VM Testbase readme:
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* ********************************
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* set TIMEOUT = 20
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* *******************************
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* This test creates a 2 dimensional matrix of (100X100)10,000 elements.
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* Each element in this matrix houses the address of a "Cell" that
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* occupies about 100 bytes. The total memory occupied by this structure is
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* about 1M.
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* Once this structure, has been built, 5 threads are let loose that
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* randomly choose an element in this matrix and set its contents to null
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* effectively creating 100bytes of garbage. The threads continue to act
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* until all 5 threads combined have "nulled out" half the cells in the matrix.
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* At this point, 5 refiller threads proceed to refill the empty
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* matrix elements with new cells.
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* Once the refiller threads have refilled all the empty matrix elements
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* with new cells, the cycle begins all over again with the 5 "emptier"
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* threads "nulling out" cells randomly.
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* This is repeated 50 times. Every iteration produces 0.5 Meg
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* of garbage. The maximum amount of live memory at use at any time is 1Meg.
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* If no garbage collection takes place during any of the ten iterations,
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* the total amount(live + garbage) of heap space consumed at the end
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* of the program is 0.5*50 + 1 = 26Meg.
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* The test fails if an OutOfMemory Exception is thrown.
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* ----------------------------- --------
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* | | | | | | | 100 |
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* | | | | | *--|------>| bytes|
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* | | | | | | --------
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* -----------------------------
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* . . . . . .
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* . . . . . .
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* . . . . . .
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* .
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* | | | | | |
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* | | | | | |
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* | | | | | |
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* ------------------------------
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* | | | | | |
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* | | | | | |
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* | | | | | |
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* ------------------------------
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* | | | | | |
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* | | | | | |
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* | | | | | |
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* ------------------------------
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* | | | | | |
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* | | | | | |
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* | | | | | |
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* -----------------------------
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*
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* @library /vmTestbase
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* /test/lib
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* @run driver jdk.test.lib.FileInstaller . .
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* @run main/othervm gc.gctests.MatrixJuggleGC.MatrixJuggleGC -iterations 1000000
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*/
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package gc.gctests.MatrixJuggleGC;
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import nsk.share.test.*;
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import nsk.share.gc.*;
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import java.util.Stack;
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import java.util.EmptyStackException;
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public class MatrixJuggleGC extends GCTestBase {
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private int threadCount = 5;
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private Matrix cm = new Matrix(100, 100);
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private Stack<IndexPair> emptiedLocations = new Stack<IndexPair>();
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private class CellEmptier extends Thread {
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private boolean keepEmptying(){
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int numberOfCells;
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int matrixSize;
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matrixSize = cm.returnArrayBound();
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numberOfCells = (matrixSize + 1) * (matrixSize + 1) ;
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if (cm.getCellCount() < numberOfCells/2)
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return true;
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else
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return false;
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}
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public void run() {
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int i, j, matrixSize,emptyCells;
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matrixSize = cm.returnArrayBound();
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while (keepEmptying()) {
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i = LocalRandom.nextInt(0, matrixSize);
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j = LocalRandom.nextInt(0, matrixSize);
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emptiedLocations.push(new IndexPair(i,j));
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cm.clear(i, j);
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}
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}
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}
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private class CellRefiller extends Thread {
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public void run() {
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int i, j, emptyCells;
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while (!emptiedLocations.empty()) {
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try {
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IndexPair pair = emptiedLocations.pop();
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cm.repopulate(pair.getI(), pair.getJ());
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} catch (EmptyStackException e) {
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break;
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}
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}
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}
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}
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private class StackDump extends Thread {
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public void run() {
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int emptyCells;
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while (true) {
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emptyCells = emptiedLocations.size();
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System.out.println("Number of empty cells = " + emptyCells);
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}
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}
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}
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private void runIteration() {
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Thread emptierArray[] = new Thread[threadCount];
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Thread fillerArray[] = new Thread[threadCount];
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for (int i = 0; i < threadCount; i++)
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emptierArray[i] = new CellEmptier();
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for (int i = 0; i < threadCount; i++)
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emptierArray[i].start();
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// wait for "emptier" threads to finish their job
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int i = 0;
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while (i < threadCount) {
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try {
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emptierArray[i].join();
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} catch(InterruptedException e) {}
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i++;
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}
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// Now start refilling.
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for (i = 0; i < threadCount; i++)
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fillerArray[i] = new CellRefiller();
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for (i = 0; i < threadCount; i++)
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fillerArray[i].start();
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i = 0;
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while (i < threadCount ){
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try {
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fillerArray[i].join();
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} catch(InterruptedException e){}
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i++;
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}
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// reset count of cells
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cm.resetCellCount();
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}
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public void run() {
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threadCount = runParams.getNumberOfThreads();
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Stresser stresser = new Stresser(runParams.getStressOptions());
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stresser.start(runParams.getIterations());
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while (stresser.iteration())
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runIteration();
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stresser.finish();
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}
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public static void main(String args[]) {
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GC.runTest(new MatrixJuggleGC(), args);
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}
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}
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