Re: page fault scalability patch v3: use cmpxchg, make rss atomic

[Matthew Wilcox]

On Mon, Aug 23, 2004 at 10:49:31PM -0700, Christoph Lameter wrote:
> Unpatched:
> Gb Rep Threads   User      System     Wall flt/cpu/s fault/wsec
>   4   3    1    0.157s     11.197s  11.035s 69261.721  69239.940
>   4   3    2    0.145s     11.445s   6.079s 67849.528 115681.409
>   4   3    4    0.182s     13.894s   4.027s 55865.834 184108.856
>   4   3    8    0.196s     24.874s   4.025s 31369.039 184790.767
> 
> With page fault scalability patch:
>  Gb Rep Threads   User      System     Wall flt/cpu/s fault/wsec
>   4   3    1    0.176s     11.323s  11.050s 68385.368  68345.055
>   4   3    2    0.174s     10.716s   5.096s 72205.329 131848.322
>   4   3    4    0.170s     10.694s   3.040s 72380.552 231128.569
>   4   3    8    0.177s     14.717s   2.064s 52796.567 297380.041

What kind of variance are you seeing with this benchmark?  I'm suspicious
that your 2 thread case is faster than your single thread case.

-- 
"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain
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