diff -r cc705c956798 -r 2f59dc95847d test/hotspot/jtreg/vmTestbase/gc/gctests/Steal/steal002/steal002.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/hotspot/jtreg/vmTestbase/gc/gctests/Steal/steal002/steal002.java Thu May 17 14:52:47 2018 -0700 @@ -0,0 +1,99 @@ +/* + * Copyright (c) 2003, 2018, 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. + */ + +/* + * @test + * @key stress gc + * + * @summary converted from VM Testbase gc/gctests/Steal/steal002. + * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent] + * VM Testbase readme: + * DESCRIPTION + * The test checks that Garbage Collector correctly uses stealing technique: + * no unexpected exceptions and errors are thrown; the JVM is not crashed. + * Actually, the test is intended for Parallel Collector. + * The test starts just one thread, then creates a small NonbranyTree and a + * huge one. Both trees are to fill about 80% of the memory. Then the test + * drops references to both trees and invoke Algorithms.eatMemory(int) to + * provoke GC to clean the memory. the GC should correctly remove both + * objects. If the GC is Parallel, there are more than one GC threads, so one + * will try to "steal" some job from others. + * + * @library /vmTestbase + * /test/lib + * @run driver jdk.test.lib.FileInstaller . . + * @run main/othervm -XX:-UseGCOverheadLimit gc.gctests.Steal.steal002.steal002 + */ + +package gc.gctests.Steal.steal002; + +import nsk.share.gc.*; +import nsk.share.test.ExecutionController; +import nsk.share.test.Stresser; + +public class steal002 extends GCTestBase { + + ExecutionController stresser; + // Number of nodes for the small tree + final static int SMALL_NODES = 10; + // Size (in bytes) for a node of the small tree + final static int SMALL_NODE_SIZE = 1; + // Number of nodes for the huge tree + final static int HUGE_NODES = 500; + // Part of the heap to fill with both trees + final static double PART_OF_HEAP = 0.8; + final int hugeNodeSize; + public static NonbranchyTree smallTree; + public static NonbranchyTree hugeTree; + + @Override + public void run() { + if (stresser == null) { + stresser = new Stresser(runParams.getStressOptions()); + stresser.start(runParams.getIterations()); + } + while (stresser.continueExecution()) { + // Create a small tree and a huge one. Then drop references + // to both of them. + smallTree = new NonbranchyTree(SMALL_NODES, 0.3f, SMALL_NODE_SIZE); + hugeTree = new NonbranchyTree(HUGE_NODES, 0.3f, hugeNodeSize); + + // Drop references to both trees and provoke GC to clean + // the memory + hugeTree = null; + smallTree = null; + + // Provoke GC to clean the memory + Algorithms.eatMemory(stresser); + } + } + + public steal002() { + hugeNodeSize = Math.max(1, (int) (PART_OF_HEAP * Runtime.getRuntime().maxMemory() / HUGE_NODES + - NonbranchyTree.MIN_NODE_SIZE)); + } + + public static void main(String args[]) { + GC.runTest(new steal002(), args); + } +}