performance impact of JNI GetCritical*

[Michael Bien]

Hello,

I have a few performance/best practice related questions regarding 
heap<->C data transfers and GC implications.

How optimized are the Get/ReleasePrimitiveArrayCritical JNI functions? 
Do they disable GC or do they only pin the array at the specific address?

If they would disable the GC until release, i suppose this would have 
pretty severe impact esp for concurrent GCs.

Could you recommend best practices?
lets say I have a short java array of length 12. Should I copy it to a 
direct NIO buffer and use the buffer as vehicle, use Get/ReleaseCritical 
or something else?


best regards,

-- 
Michael Bien
http://michael-bien.com/