libcj java.nio.DirectBuffer is slow (no inlining)

["P.O. Gaillard" <pierre-olivier dot gaillard at fr dot thalesgroup dot com>]

Hello,

I am using the gcj 4.1 that came with Fedora Core 5 and the NIO buffers are 
quite slow. From what I see with Oprofile, I would say that this is because the 
code is not inlined.

Is it possible (safe, reasonable?) to compile libgcj with -O3 ? If so why is the 
libgcj in FC5 not compiled that way ?

Also, I have noticed that inlining does not seem to happen with methods from 
other classes and non final methods. Am I right ?

Gnat has the infrastructure to do inlining between separate compilation units 
with -gnatn. This can bring great performance improvements for code with lots of 
small methods. Is this feature also available for GCJ ?


  thank you very much for your attention,

  P.O. Gaillard