[Beowulf] AMD64 results...

Mikhail Kuzminsky kus at free.net
Thu Dec 16 10:58:16 EST 2004


In message from Bill Broadley <bill at cse.ucdavis.edu> (Wed, 15 Dec 2004 
22:29:43 -0800):
>> 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 
>think
>it's usually faster to have node interleaving off with 2 processes 
>(if not
>1).
>> 
>> > 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
>compiler working.
>
>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 :-))

Yours
Mikhail Kuzminsky
Zelinsky Institute of Organic Chemistry
Moscow

>-- 
>Bill Broadley
>Computational Science and Engineering
>UC Davis
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