How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920

[Andriy Gapon]

on 15/04/2010 04:20 Maho NAKATA said the following:
> Hi Andriy and Adam,
> 
> I did also the same thing as suggested. 
> 
> my conclusion: on Core i7 920, 2.66GHz, TurboBoost on, HyperThreading off,

So HyperThreading is off.

> then, pinned to each core like following
> 
> % procstat -t 1408
>   PID    TID COMM             TDNAME           CPU  PRI STATE   WCHAN    
>  1408 100160 dgemm            -                  3  190 run     -         
>  1408 100161 dgemm            -                  2  190 run     -         
>  1408 100162 dgemm            -                  2  190 run     -         
>  1408 100163 dgemm            -                  1  189 run     -         
>  1408 100164 dgemm            -                  0  190 run     -         
>  1408 100165 dgemm            -                  3  189 run     -         
>  1408 100166 dgemm            -                  1  190 run     -         
>  1408 100167 dgemm            initial thread     0  190 run     -  

But there are still 8 threads.

Can you check how many threads you have on Linux with the same configuration?
Is it possible to tell GotoBLAS to use 4 threads?
If yes, can you also test that scenario?

Also, would it be possible for you to test recent 8-STABLE?
Just for the sake of experiment.
-- 
Andriy Gapon