Re: Interesting analysis of linux kernel threading by IBM

From: David Lang (dlang@diginsite.com)
Date: Mon Jan 24 2000 - 11:46:57 EST


On Sun, 23 Jan 2000, Sean Hunter wrote:

> On Sun, Jan 23, 2000 at 03:50:32PM +0100, Davide Libenzi wrote:
> > We can write this :
> >
> > TS_old = Ko + O( N )
> > TS_new = Kn + O( log( N ) )
> >
> > Where N is the RQ size.
> >
> > Now the curve of TS_new( N ) goes down ( intersect ) the curve TS_old( N ) in a
> > point that in the worse case I've measured is N = 8 ( I prefer always to report
> > worse cases to avoid to be shooted ), but I've measured even 4 with a medium
> > that I can think to be near to six.
>
> In other words, almost all real-world cases lose. Nice...
>
> Sean

If you are on a 8 way SMP box a load of 4 is very reasonable. on anything
less then a 4-way SMP box it is almost certinly a loss.

David Lang

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