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

[Maho NAKATA]

opps I missed this e-mail...

From: Adam Vande More <amvandemore at gmail.com>
Subject: Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920
Date: Wed, 14 Apr 2010 11:45:04 -0500

> On Wed, Apr 14, 2010 at 11:34 AM, Adam Vande More <amvandemore at gmail.com>wrote:
> 
>>
>>
>>
>> That's about 67% utilization, turning off HTT drops it more.  HTT on the
>> newer cores is good, not bad.
>>
> 
> Well that was completely contrarty to some tests I'd run when I first got
> the cpu.
> 
> With HTT off:
> 
> n: 3000
> time : 44.705516 or 11.760183
> Mflops : 45932.959253
> n: 3100
> time : 50.598581 or 14.270123
> Mflops : 41766.437458
> n: 3200
> time : 55.748192 or 15.780977
> Mflops : 41541.458400
> n: 3300
> time : 62.072217 or 17.441431
> Mflops : 41221.262070
> n: 3400
> 
> so that's about 79% right there.
> 
> also if I run cpuset on the dgemm then the utilization is basically at the
> theoretical max for one core so at least that part is working.
> 
> -- 
> Adam Vande More