sp at scali.no
Sun Oct 15 04:34:51 EDT 2000
Mark Hahn wrote:
> > This stream run was on a Dual 667MHz Tyan Thunder 2500, which also use the
> > Serverworks HE chipset with interleaving. Dual processor test is done
> > with OMP.
> what's "OMP"?
OMP is OpenMP parallelizing used to utilize both processors in a SMP
This produces a bit more accurate results when running stream on a SMP
because the application itself starts up with two processes (i.e you
don't have to use spawn two copies of stream manually and add the
> > Function Rate (MB/s) Avg time Min time Max time
> > Copy: 422.4479 0.0758 0.0757 0.0758
> > Scale: 419.2815 0.0764 0.0763 0.0768
> > Add: 540.3517 0.0889 0.0888 0.0889
> > Triad: 540.2243 0.0889 0.0889 0.0900
> wow, not impressive. is this cas3 PC100 or something?
> my incredibly cheap duron/600/pc133 does:
> Function Rate (MB/s) RMS time Min time Max time
> Assignment: 525.1589 0.0305 0.0305 0.0306
> Scaling : 505.7214 0.0317 0.0316 0.0317
> Summing : 553.1737 0.0434 0.0434 0.0435
> SAXPYing : 523.9031 0.0458 0.0458 0.0459
> thanks, mark hahn.
This is PC133, but AMD systems have a better memory system and get
higher bandwidths. They also has more FLOPS than Intel processors (using
two floating point instructions per cycle rather than one). The only
disadvantage yet is that they don't have SMP's.
Alpha systems have even higher bandwith with the same (or older) memory
technology, this is a EV67 running at 667MHz with PC100 SDRAM (The
system bus on Tsunami based Alpha systems run on 83MHz).
Function Rate (MB/s) Avg time Min time Max time
Copy: 1067.5483 0.0304 0.0300 0.0320
Scale: 1057.2926 0.0307 0.0303 0.0313
Add: 1067.0038 0.0454 0.0450 0.0460
Triad: 1036.0382 0.0466 0.0463 0.0471
So you see it is not only the memory technology itself (the RAM chips),
but it has a lot to do with memory subsystem and processor technology.
Steffen Persvold Systems Engineer
Email : mailto:sp at scali.no Scali AS (http://www.scali.com)
Tlf : (+47) 22 62 89 50 Olaf Helsets vei 6
Fax : (+47) 22 62 89 51 N-0621 Oslo, Norway
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