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* [Bug java/41549] New: [jni] very slow jni code callbacks
@ 2009-10-02 15:48 hermantenbrugge at home dot nl
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From: hermantenbrugge at home dot nl @ 2009-10-02 15:48 UTC (permalink / raw)
To: java-prs
See mailing list:
http://gcc.gnu.org/ml/java/2009-09/msg00030.html
I have a problem with jni code callbacks.
I have attached some code that shows the problem.
The result of this code is:
# results on fedora 11
# gcc/gcj 4.4.1
# kernel 2.6.30.5-43.fc11.x86_64
# openjdk fedora-29.b16.fc11-x86_64
#
# open jdk gcj
# no_jni 1.48 7.46 ( 5 times slower)
# jni 66.70 17140.00 (257 times slower)
So when not using jni in this case gcj is 5 times slower.
I suspect the jit compiler does a good for this small sample.
The code with jni calls is however 257 timer slower. I really
did not expect that. I also tried other java vm and they all
have much better performance. So I expect a problem in the
gcj library.
When I use oprofile I see at lot of calls to execute_cfa_program
and _Unwind_IteratePhdrCallback.
--
Summary: [jni] very slow jni code callbacks
Product: gcc
Version: 4.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: java
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hermantenbrugge at home dot nl
GCC host triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41549
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2009-10-02 15:48 [Bug java/41549] New: [jni] very slow jni code callbacks hermantenbrugge at home dot nl
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