Re: Process Creation Speed

[Johannes Stezenbach]

Jamie Lokier wrote:
> Eric wrote:
> > > None of this answers the question which is relevant to linux-kernel:
> > > why does process creation take 7.5ms and fail to scale with CPU
> > > internal clock speed over a factor of 4 (600MHz x86 to 2.2GHz x86).
> > 
> > The reason it doesn't scale is probably because the kernel always runs at a 
> > specified speed, 100HZ which leaves 10ms(i believe?) timeslices. I would try 
> > a HZ patch and bump it up to 1000, i bet you would see a big difference then.
> 
> Hmm.  The timer speed shouldn't affect the measured speed of fork() at
> all.  It might show up if the measuring program is dependent on the
> timer in some way, though.

http://bulk.fefe.de/scalability/ has some benchmarks on the issue.
But I guess the numbers depend heavily on the server/CGI software used.

Johannes
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