Has anybody experience how i can messure the memory usage from JNI
Lib's inside websphere ?
One possible approach might be to look at the demo source Sun
provides for the hprof tool.
I'm not remembering for sure which version I tried it on but I made
modifications to that to add some information from getrusage for cpu
times and i/o usage. I'm not sure if I did this at 1.3 or 1.4. I
don't know what you'd use instead of getrusage for memory.
I am also not immediately seeing where I have to URL for the demo
hprof code that I used.
I do notice that even the 1.6 jdk appears to include a
java_hprof_demo directory. Whether that demo refers to a complete
implementation or only certain hprof profiling features I don't know.
Having any kind of profiling turned on is probably itself going to
impact performance which could also be a big concern.
There is always coming up with your own profiling information if you
have a command to check it periodically. I'm not sure I've seen
anything on how reliable the Runtime memory stuff is on OS X. On the
classical Mac VM's it wasn't considered real accurate and I tried
extending it with a little native of my own. But you could even just
check that periodically from java to see where you are at.
What I did with the hprof demo code is at http://www.spacestar.net/
users/mikehall/hprof.jar if of any interest. I don't think I have a
link to it or make any mention of it on my pages. My changes didn't
add enough new information for what I was testing to make it worth
attempting on-going support.
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