47 lines
2.1 KiB
Plaintext
47 lines
2.1 KiB
Plaintext
Copyright (c) 2007, 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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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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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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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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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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Test garbage collector compaction.
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The test starts several threads which create objects using
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given garbage producer until OOM. The references are kept
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in an array. The references to even elements are cleared
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and objects of double size are created until OOM. The garbage
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collector will have to compact free space to free memory for
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new objects.
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The tests differ by object types used for first and second phase:
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- _Arrays tests randomly use arrays of basic types and Object[] arrays.
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- _Strings tests use random strings.
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- _NonbranchyTree tests use nonbranchy trees.
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- _InternedStrings use interned strings.
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- _ArrayOf tests use array with two elements for second phase,
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the elements of which point to objects of same type.
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- _TwoFields tests use object with two fields for second phase,
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which point to objects of same type.
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Each *1 test is the single-threaded version of corresponding test.
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The Humongous tests are similar to compact tests. However they used
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the fixed size of objects which allocation requre compaction. The
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size is specific for G1 GC (about 1M and 5M) and require humongous
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object creation in G1.
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