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Quick Lists
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Bug ID:
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6471009
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Votes
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0
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Synopsis
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Significantly higher CPU usage in jvm1.6 build 97/98 vs jvm1.5.0_06-b05 on DOTS ATCJ2 test
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Category
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hotspot:compiler2
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Reported Against
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Release Fixed
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hs11(b06),
6u10(b09) (Bug ID:2152719)
, 7(b20) (Bug ID:2177027)
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State
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10-Fix Delivered,
bug
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Priority:
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4-Low
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Related Bugs
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4850474
,
6602813
,
6610906
,
6646599
,
6653858
,
6763424
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Submit Date
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14-SEP-2006
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Description
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We are seeing much higher CPU usage on JVM 1.6 than on JVM 1.5 when
running the "DOTS ATCJ2" test on a large Derby / Java DB database.
The test has previously been run with jvm1.5.0_06-b05 on Solaris 10 1/06
s10x_u1wos_19a X86 - SunOS 5.10 Generic_118844-26.
Increased CPU usage is seen with jvm1.6.0-rc-b97 and b98.
The size of the database is ~342GB (du -h: 342G TESTDB/seg0).
(# tuples in ATCJ2 tables: BID: 3.4 mill., ITEM: 600 mill., REGISTRY:
417 mill.)
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* DOTS: see http://ltp.sourceforge.net/dotshowto.php ,
http://db. customer .org/derby/integrate/DOTS_Derby.htm ,
http://db. customer .org/derby/binaries/UsingDotsDerbySystemTest.pdf .
We have adapted DOTS to also run on other OS's than Linux.
Posted Date : 2006-09-14 22:21:26.0
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Work Around
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Force using 'Client VM' ('java -client ....') on 'server hw'!
(1.6.0_01-b06 and 1.6.0_02-b05)
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Evaluation
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Looks like a scalability problem with the nmethod dependency tracker.
Posted Date : 2006-10-18 22:24:50.0
There is still an architectural scalability problem, in that the application uses thousands of small throw-away classes, one per SQL query. It should use anonymous classes. The MLVM functionality should be ported into hotspot and used by derby as an implementation private interface.
http://blogs.sun.com/jrose/entry/anonymous_classes_in_the_vm
http://openjdk.java.net/projects/mlvm/subprojects.html#AnonymousClasses
Posted Date : 2008-04-23 21:39:23.0
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Comments
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PLEASE NOTE: JDK6 is formerly known as Project Mustang
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