Performance regression in java.util.zip.Deflater
David.Bristor at Sun.COM
Fri Dec 21 01:38:30 UTC 2007
Clemens Eisserer wrote:
> Hello again,
>> jdk/test/java/util/zip/FlaterTest.java can be used to compare different JVMs;
>> I'm sorry but I don't think we have a better test. See also the code in
>> 6364346 and/or 6507183.
> Sorry if that sounds a bit dumb, how can I access
> I rewrote the native method a bit (because I thought it was messy), so
> I am afraid I destoyed some cases - are there also correctness
Sorry: presuming you got the code via hg.openjdk.java.net, from e.g.
jdk/tl/jdk, the test (and other zip tests) are in
They're jtreg tests; you can run them using jtreg by hand, or by using the
"jarzip" NetBeans project:
>> I don't see a block in the ArrayRegion functions (a little surprisingly):
>> (Search for just "arrayregion"). Compare the array region function body with
>> the primitivearraycritical function body; the latter obviously interacts with GC.
> I am no expert, but doesn't each jni-function block the jvm, like a
> synchronized modifier in java? I thought for this are
> JNI_ENTRY/JNI_END macros?
> I can be wrong of course, its just a guess.
I suppose, but didn't find the definitions of those (yet).
>> I'm no expert here! See 6186200's discussion of GC & critical sections.
> Thanks a lot, very interesting :)
> lg Clemens
> Btw. No need to stress or hurry, its just a "holiday-fun-bugfix"
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