Re: Thread implementations...
Richard Gooch (Richard.Gooch@atnf.CSIRO.AU)
Mon, 22 Jun 1998 09:38:43 +1000
Alan Cox writes:
> > > This involves kernel bloat. It seems to me that there is such a simple
> > > userspace solution, so why bother hacking the kernel?
> >
> > I don't think the userspace solution is as fast as the event queue
> > solution.
>
> I think thats pretty obvious. Select() is an event queue mechanism which
> does a setup for each select(). Asynchronous I/O has some similar
> properties (clone, I/O , signal) but is only per handle. A pure event
> queue model does one setup per handle only per handle that matters and
> not per event setups. You just get the queue overheads
The point is a good userspace solution should be *fast enough*. I
define "fast enough" to be "such that polling overheads contribute
less than 10% of the application load".
Regards,
Richard....
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