Re: AMD dual core vs Intel core 2 quad
On Wed, Feb 06, 2008 at 04:44:41PM +0000, Jo Shields wrote:
>> To be specific: when I run molecular dynamics (MD) on Debian amd64
>> with my shared memory Thunder with 2 AMD dual core, parallelization
>> support OpenMPI (everything compiled with Intel ifort/icc), the MD
>> program sees 4 cpus and "top -i" indicates four cpu at work. The
>> gain with respect to running MD in serial mode is about threefold,
>> i.e. the parallelization is not bad at all. What can I expect - from
>> this viewpoint - with four Intel Core 2 quad?
> - but the achilles heel of the Intel platform is memory contention,
> and for heavily memory-bound codes, scalability will be poor.
> Conversely, for CPU-bound codes, performance will be SIGNIFICANTLY
> better. Roughly speaking, using a 4-way GROMACs job as an example, the
> same job could complete about 25% faster, clock for clock, on Intel.
A bit offtopic, but maybe Francesco would benefit from a PS3 if (big IF)
you can fit your computations in 256MB and can do a decent job of
programming the SPUs. Or maybe even faster (and more memory) a GPU.
--
Daniel Tryba
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