[haiku-development] Re: On timeslices and cycles
- From: André Braga <meianoite@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Thu, 12 Mar 2009 21:53:19 -0300
On Thu, Mar 12, 2009 at 20:58, Stephan Aßmus <superstippi@xxxxxx> wrote:
> The human perception is a more or less fixed factor. I don't think anything
> can be gained (ie. be made to appear more fluently) by switching more often,
> unless you have a lot of threads actually running in parallel (ie not
> waiting on something). So switching more often sounds like it would only
> waste CPU.
On the other hand, as far as cycles and IPS are concerned, a
milisecond on a 200MHz is a *lot* different than a milisecond on a
3GHz CPU. Not taking this into consideration if you boost thread
priorities based on consumed quantum is a *bad* idea.
> As for the CPUs which have different speed, I think it's also a concern for
> Hyper Threading. You wouldn't want to schedule a thread on a second logical
> core, if another physical core is readily available at the same time. So you
> need some kind of speed-bonus associated with each CPU anyways.
I'm discussing this very matter on the article I'm writing. :)
(Which I'm probably going to post as a number of smaller entries. Else
it's too much information crammed in a single blog post, and I've been
TLDR'd before :P)
Cheers,
A.
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