[Vm-dev] OS X Mavericks & cog tickers

Casey Ransberger casey.obrien.r at gmail.com
Fri Oct 25 00:33:29 UTC 2013

So as I understand it, the scheduling in Mavericks is designed to cut down
on wasted time and energy powering up and down the CPU/GPU. I have no idea
what that's going to do to the heartbeat. AppNap is I think orthogonal to
the processor scheduling thing.

Anyway, has anyone built a VM on Mavericks yet? Seems like the best way to
find out what the impact of this stuff might be.

On Thu, Oct 24, 2013 at 5:21 PM, tim Rowledge <tim at rowledge.org> wrote:

> On 24-10-2013, at 5:09 PM, Igor Stasenko <siguctua at gmail.com> wrote:
> >
> > you mean stepping?
> > you can signal that semaphore if someone needs to step, as easy as:
> >
> > [ [stepTime asDelay wait. sema signal ] repeat ] fork
> >
> > (sure not exactly like above, but you got an idea)
> >
> > i see no problem here.
> >
> That - or something similar, as you say - would provide current morphic
> behaviour BUT it is really just a way to cause the problem time coalescing
> is trying to solve.
> I strongly suspect there is a lot of improvement in Morphic performance
> that can be gained by making the morphs do smarter (or less) stepping work.
> Obviously an animated widget is going to want to, well, animate. Almost all
> widgets to do with text display (editors, lists, buttons) aren't animating.
> They don't need to step unless there is good reason to think something
> relevant has changed. As an example, Scratch performance on a Pi took a
> good step (d'oh, bad pun) forward simply by stopping UpdatingStringMorphs
> (used for watcher-morphs, for game scores etc) from querying and
> redisplaying their value every time and instead only re-displaying when the
> value changed. I suspect here are a lot of cases where we know that some
> code is going to change state that will then need displays updating and
> instead of relying on a large number of dumb polling tests we might use an
> analogue of the old changed/update mvc protocols that *only* advise of a
> need to step soon.
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> Useful random insult:- A kangaroo loose in her top paddock.
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