Re: [PATCH] token based thrashing control

[Andrew Morton]

Rik van Riel <riel@xxxxxxxxxx> wrote:
>
> On Fri, 30 Jul 2004, Rik van Riel wrote:
> 
>  > I have run a very unscientific benchmark on my system to test
>  > the effectiveness of the patch, timing how a 230MB two-process
>  > qsbench run takes, with and without the token thrashing
>  > protection present.
>  > 
>  > normal 2.6.8-rc2:	6m45s
>  > 2.6.8-rc2 + token:	4m24s
> 
>  OK, I've now also ran day-long kernel compilate tests,
>  3 times each with make -j 10, 20, 30, 40, 50 and 60 on
>  my dual pIII w/ 384 MB and a 180 MB named in the background.
> 
>  For make -j 10 through make -j 50 the differences are in
>  the noise, basically giving the same result for each kernel.
> 
>  However, for make -j 60 there's a dramatic difference between
>  a kernel with the token based swapout and a kernel without.
> 
>  normal 2.6.8-rc2:	1h20m runtime / ~26% CPU use average
>  2.6.8-rc2 + token:	  42m runtime / ~52% CPU use average

OK.  My test is usually around 50-60% CPU occupancy so we're not gaining in
the moderate swapping range.
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