77 lines
3.5 KiB
Java
77 lines
3.5 KiB
Java
/*
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* Copyright (c) 2017, 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/LargeObjects/large004.
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* VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
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* VM Testbase readme:
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* DESCRIPTION
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* The test checks that Garbage Collector correctly does not throw any
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* unexpected exceptions/errors while allocating large objects (classes
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* that have more than 65535 fields and classes that have less than 65535
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* fields). 65535 of fields is a limitation for JVM (see JVM specification
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* Second edition 4.10).
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* Since it is impossible to create one class with about 65535 of fields
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* (javac cannot compile it), a child class extends a parent class, so the
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* fields are devided into two subsets. However, the child class still has
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* about 65535 of fields.
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* The test starts a number of threads. This number is either set in *.cfg
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* file or is calculated by the test itself based on the machine (see
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* nsk.share.gc.Algorithms.getThreadsCount() method). As soon as all threads
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* are started, each thread begins its checking.
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* There are 13 classes to be loaded by each thread. These classes are
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* generated by nsk.share.gc.Generator (see its javadoc for more details).
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* Each class has a huge number of fields, but this number is less than the JVM
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* limitation.
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* The test loads the classes with nsk.share.gc.GCClassUnloader class that
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* extends nsk.share.ClassUnloader and has a bit different algorith of eating
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* heap. As soon as a class is loaded, the test creates an instance of
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* it - allocates an object of that type. Then it drops references to the
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* class and to the instance and tries to unload the class. The test does not
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* expect any exceptions to be thrown.
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* Additionaly to original tests this test create object with large count of
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* field which contains also a reference to other such object wich also
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* contains same reference and so on. The deep of such aggregation is controlled
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* by the test. These references are verified after GC.
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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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*
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* @comment generate and compile nsk.share.gc.newclass.* classes
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* @run driver nsk.share.gc.GenClassesBuilder
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*
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* @run main/othervm
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* -XX:-UseGCOverheadLimit
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* gc.gctests.LargeObjects.large001.large001
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* -largeClassesPath classes
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* -isOverLimitFields true
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* -aggregationDepth 1
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* -t 1
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*/
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