|Summary:||[jni] very slow jni code callbacks|
|Product:||gcc||Reporter:||Herman ten Brugge <hermantenbrugge>|
|Component:||java||Assignee:||Not yet assigned to anyone <unassigned>|
|Severity:||normal||CC:||d, gcc-bugs, java-prs|
|Build:||Known to work:|
|Known to fail:||Last reconfirmed:|
Description Herman ten Brugge 2009-10-02 15:48:57 UTC
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 220.127.116.11-43.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.
Comment 1 Andrew Pinski 2016-09-30 22:48:41 UTC
Closing as won't fix as the Java front-end has been removed from the trunk.