[Beowulf] 64bit comparisons

[Andrew Wang]

I believe you can get more info from the following
mailing lists:

"hpc", "scitech", "xgrid-users"

see: http://lists.apple.com/mailman/listinfo

Also, people on those lists (if I remember correctly)
use LAM-MPI, GridEngine, and also the IBM xlc/xlf
compilers (XL compilers generate faster code for the
G5).

Andrew.


 --- "Hujsak, Jonathan T (US SSA)"
<jonathan.hujsak at baesystems.com> ªº°T®§¡G
> Have you gained any new 'lessons learned' since the
> communication 
> below? Can you recommend a good version of MPI to
> use for these?
> 
> We've been looking at MPICH, MPIPro and also the
> Apple xgrid...
> 
>  
> 
> Thanks!
> 
>  
> 
> Jonathan Hujsak
> 
> BAE Systems
> 
> San Diego
> 
>  
> 
> Bill Broadley bill at cse.ucdavis.edu
>
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>
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> 
> Fri May 14 11:48:21 PDT 2004 
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>   _____  
> 
> On Fri, May 14, 2004 at 09:44:01AM -0700, Robert B
> Heckendorn wrote:
> > One of the options we are strongly considering for
> our next cluster is
> > going with Apple X-servers.  There performance is
> purported to be good
>  
> Careful to benchmark both processors at the same
> time if that is your
> intended usage pattern.  Are the dual-g5's shipping
> yet?  Last I heard
> yield problems were resulting in only uniprocessor
> shipments.  My main
> concern that despite the marketing blurb of 2
> 10GB/sec CPU interfaces
> or similar that there is a shared 6.4 GB/sec memory
> bus.
>  
> > and their power consumption is small.
>  
> Has anyone measured a dual g5 xserv with a
> kill-a-watt or similar?
>  
> > Can people comment on any comparisons betwee Apple
> and (Athlon64
> > or Opteron)?
>  
> Personally I've had problems, I need to spend more
> time resolving them,
> things like:
> *       Need to tweak /etc/rc to allow Mpich to use
> shared memory
> *       Latency between two mpich processes on the
> same node is 10-20
> times the 
>     linux latency.  I've yet to try LAM.
> *   Differences in semaphores requires a rewrite for
> some linux code I
> had
> *   Difference in the IBM fortran compiler required
> a rewrite compared
> to code
>     that ran on Intel's, portland group's, and GNU's
> fortran compiler.
> 
>  
> Given all that I'm still interested to see what the
> G5 is good at and
> under
> what workloads the G5 wins perf/price or perf/watt.
>  
> -- 
> Bill Broadley
> Computational Science and Engineering
> UC Davis
> 
>  
> 
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