BM Seer Unofficial thoughts from an anonymous Sun employee

Woodcrest lagging on GHz gain?

Thursday Nov 02, 2006

Woodcrest having issues scaling with GHz? On the SPECfp_rate2000 result website, when Woodcrest goes from 2 GHz to 3 Ghz (50% clock increase), but the SPECfpRate only adds 17.8%. Not good, is it?

System Chip/GHz Config Score

Fujitsu Siemens CELSIUS R540 5160 3.0 GHz 4-core 2-Socket 80.6

Fujitsu Siemens CELSIUS R540 5150 2.66 GHz 4-core 2-Socket 77.4

Fujitsu Siemens CELSIUS R540 5130 2.0 GHz 4-core 2-Socket 68.4

I'm thinking memory latency is an issue? Tomorrow, I'll look at scaling as you add cores, maybe an issue there?

System	Chip/GHz	Config	Score
Fujitsu Siemens CELSIUS R540	5160 3.0 GHz	4-core 2-Socket	80.6
Fujitsu Siemens CELSIUS R540	5150 2.66 GHz	4-core 2-Socket	77.4
Fujitsu Siemens CELSIUS R540	5130 2.0 GHz	4-core 2-Socket	68.4

Disclosure

Fujitsu Siemens CELSIUS R540 2.0GHz (2chips,4cores), 68.4 SPECfp_rate2000, Fujitsu Siemens CELSIUS R540 2.66GHz (2chips,4cores), 77.4 SPECfp_rate2000, Fujitsu Siemens CELSIUS R540 3.0GHz (2chips,4cores), 80.6 SPECfp_rate2000. SPEC, SPECint reg tm of Standard Performance Evaluation Corporation. Results from www.spec.org as of 11/2/06.

[5] Comments