48 lines
2.0 KiB
Plaintext
48 lines
2.0 KiB
Plaintext
Copyright (c) 2013, 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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metaspace/gc tests - are the test for the Metaspace GC tuning, which is described in the
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Java SE 8 HotSpot[tm] Virtual Machine Garbage Collection Tuning
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Tests load classes and monitor the used/committed amounts of metaspace.
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There are three types of tests all extending base class - MetaspaceBaseGC
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MemoryUsageTest -
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trivial test to check memory dynamic (loading classes should lead to growth
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of used memory, gc to reduce)
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FirstGCTest -
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loads classes until the GC has happened and check the GC has happened at the
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right moment (as stated in the Spec)
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HighWaterMarkTest
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The test loads classes until the committed metaspace achieves the certain
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level between MetaspaceSize and MaxMetaspaceSize.
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Then it counts how many times GC has been induced.
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Test verifies that MinMetaspaceFreeRatio/MaxMetaspaceFreeRatio settings
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affect the frequency of GC. (High-water mark)
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Note: GC could be caused not by Metaspace. When GC happens, the tests check
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gc.log file to find the reason of GC. Tests will pass if there is no guarantee
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that GC was induced by metaspace.
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