On Oct 8, 2004, at 10:52 AM, Christian Simon wrote:
> I use IBM's XLC/XLF under MacOSX Server 10.3.5. and I need fortran
> support,
> so I recompiled the lam-mpi libs (7.1 version, with 7.1.1, I did not
> tried), very simply:
>
> ./configure CC=xlc FC=xlf FFLAGS=-qextname --prefix=/usr/local/lam-7.1
> --with-trillium --disable-tv-queue --with-memory-manager=none
>
> Things work. Ok. But I would like to improve performances.
> What would you suggest (apart adding CFLAGS=-O3) ?
LAM generally doesn't see much speedup from one optimization level to
another - it just doesn't have much that a compiler can work with. So
the real question is what will help your application out. Apple has a
couple of pages up on optimizing applications for the G5, some of which
include information on the XL compilers. You might want to have a look
at their developer pages for more information:
http://developer.apple.com/
> What is the configure command issued for the package (.dmg)
> distributed ?
./configure --prefix=PREFIX --with-rsh=ssh --without-fc \
--without-cs-fs --enable-static --enable-shared
> Does it use gcc or another C compiler ?
gcc/g++, from the Developer Tools.
Hope this helps!
Brian
--
Brian Barrett
LAM/MPI developer and all around nice guy
Have a LAM/MPI day: http://www.lam-mpi.org/
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