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Quick Lists
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Bug ID:
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6849716
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Votes
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0
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Synopsis
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BitMap: performance regression introduced with G1
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Category
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hotspot:garbage_collector
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Reported Against
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Release Fixed
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hs16(b05),
7(b63) (Bug ID:2179585)
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State
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10-Fix Delivered,
bug
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Priority:
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2-High
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Related Bugs
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6711316
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6814552
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Submit Date
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10-JUN-2009
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Description
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The G1 integration (6711316: Open source the Garbage-First garbage collector) introduced a large performance regression in BitMap operations which are used heavily by parallel compaction. A synthetic benchmark shows a 50% increase in full gc time w/parallel compaction after 6711316.
Posted Date : 2009-06-10 08:05:27.0
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Work Around
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N/A
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Evaluation
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The BitMap functions verify_index() and verify_range(), which contain only asserts, were changed from inline to out-of-line and the definitions moved to BitMap.cpp. This forced the c++ compilers to insert calls to the (empty) functions in product builds. Previously, the empty inline bodies were optimized away.
Posted Date : 2009-06-10 08:05:27.0
http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/6e2afda171db
Posted Date : 2009-06-14 11:01:35.0
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Comments
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PLEASE NOTE: JDK6 is formerly known as Project Mustang
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