[Beowulf] Better C2D or Quadcore

Bill Broadley bill at cse.ucdavis.edu
Wed Nov 28 18:44:33 EST 2007


Chris Samuel wrote:
> PGI 7.1-1 : pgcc -mp -fastsse -tp barcelona-64,k8-64 -Mipa=fast -o 
> stream ./stream.c

I have found that PGI does great on dynamic arrays, but poorly on
static.  Alas the inverse is true for pathscale, great on static
arrays but poorly on dynamic.

A 2.0 barcelona compiled with pathcc -O3 -mp:
Function     Rate (MB/s)  Avg time   Min time  Max time
Copy:      15314.6654      0.0084      0.0084      0.0084
Scale:     15239.8919      0.0084      0.0084      0.0084
Add:       14763.5318      0.0130      0.0130      0.0131
Triad:     14949.9019      0.0129      0.0128      0.0129

> 
> Function      Rate (MB/s)   Avg time     Min time     Max time
> Copy:       12261.7219       0.1044       0.1044       0.1045
> Scale:      12284.4198       0.1042       0.1042       0.1043
> Add:        12213.4179       0.1574       0.1572       0.1581
> Triad:      11875.6082       0.1619       0.1617       0.1621
> 
> Intel v10 : icc -static-intel -openmp -O5 -o stream-icc stream.c
> 
> Function      Rate (MB/s)   Avg time     Min time     Max time
> Copy:       12214.5757       0.1048       0.1048       0.1050
> Scale:      12155.7238       0.1054       0.1053       0.1055
> Add:        12243.4062       0.1569       0.1568       0.1570
> Triad:      12240.2984       0.1569       0.1569       0.1570
> 
> cheers,
> Chris
> 
> 
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