No "last core parallel slowdown" on OS X

[Dave Bayer]

On Apr 19, 2009, at 9:59 PM, Tyson Whitehead wrote:

> This leave me wondering how do the absolute numbers compare?  Could  
> the extra
> overhead due to the various 32bit issues be giving more room for  
> better
> threading performance?  What do you get if you use 32bit GHC with  
> Linux?


Oddly enough, these are 32 bit GHC implementations in both cases. Our  
departmental sys admin has stayed with 32 bit Linux.

cores, real, user, ratio

> Linux
> 2 x 3.16 GHz Xeon X5460
> 1       2       3       4
> 466.7   250.8   183.7   149.3
> 466.4   479.0   505.2   528.1
> 1.00    1.91    2.75    3.54
>
> OS X
> 2.4 GHx Q6600
> 1       2       3       4
> 676.9   359.4   246.7   191.4
> 673.4   673.7   675.9   674.8
> 0.99    1.87    2.74    3.53