[Beowulf] AMD64 results...
kus at free.net
Thu Dec 16 07:58:16 PST 2004
In message from Bill Broadley <bill at cse.ucdavis.edu> (Wed, 15 Dec 2004
>> and important to some people. but almost any real code will take
>> advantage of having twice as many registers (integer and SIMD).
>Indeed, assuming you have the source to recompile.
>> don't forget to turn on node interleave in the bios, too.
>Assuming a 2.4 kernel I believe that helps single processes running
>on a dual, but doesn't help when 2 processes are running. With 2.6 I
>it's usually faster to have node interleaving off with 2 processes
>> > Kudos for the pathscale-1.4 compiler with -O3.
>> ironically, icc -xW generates pretty good-for-opteron code,
>> though of course, it's 32b. I haven't tried using icc to
>> generate em64t/and64 code.
>With 8.0 and 8.1 I can't seem to get it working on a RHEL x86-64 box
>or a Rocks (RHEL-3 based) x86-64 box.
>I'll retry with a nacoma based machine and see if I can get the intel
>I get errors with 8.0 like:
>/usr/bin/ld: skipping incompatible /opt/intel_cc_80/lib/libsvml.a
>when searching for -lsvml
>or with 8.1:
>ld: skipping incompatible /usr/lib64/libm.so when searching for -lm
Yes, it's because ld need to know that you work w/32 bits,
i.e. you should add -Wl,-melf_i386
(if I remember keys right :-))
Zelinsky Institute of Organic Chemistry
>Computational Science and Engineering
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