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

[Maho NAKATA]

Hi Adam,

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 12:47:31 -0500

> Since this is a full fledged desktop environment, 90% utilization seems
> pretty good.	

No, I don't think so. Even on Ubuntu,
mine is running on a full desktop environment, GotoBLAS's performance
is about 95% using dgemm. dgemm on Linux is lot more stabler than FreeBSD
and clearly faster.

on Ubuntu
$ ./dgemm
n: 3000
time : 51.180000 or 12.795519 
Mflops : 42216.341930
n: 3100
time : 56.280000 or 14.261719 
Mflops : 41791.049205
n: 3200
time : 61.350000 or 15.631380 
Mflops : 41939.023080
n: 3300
time : 67.790000 or 17.247202 
Mflops : 41685.474166
n: 3400
time : 73.800000 or 18.471321 
Mflops : 42569.300032
n: 3500
time : 81.480000 or 20.781936 
Mflops : 41273.585044
n: 3600
time : 88.170000 or 22.816965 
Mflops : 40907.246233
n: 3700
time : 95.210000 or 23.864101 
Mflops : 42462.684969
n: 3800

thanks
-- Nakata Maho http://accc.riken.jp/maho/ , http://ja.openoffice.org/ 
   Nakata Maho's PGP public keys: http://accc.riken.jp/maho/maho.pgp.txt