Hi Dave,

I haven’t actually tried it but it seems on a slow platform this would
delay the first-time startup by however long those benchmarks take, right?

IsLowPerformance is used to determine if the full wizard is shown or a
cheaper one.

Vanessa

On Thu 31. Dec 2020 at 09:47, David T. Lewis <lewis at mail.msen.com> wrote:

> On Tue, Dec 22, 2020 at 02:07:30PM -0800, Vanessa Freudenberg wrote:
> > (dropping vm-dev)
> >
> > On Tue, Dec 22, 2020 at 1:57 PM Eliot Miranda <eliot.miranda at gmail.com>
> > wrote:
> >
> > >
> > > On Tue, Dec 22, 2020 at 1:44 PM Vanessa Freudenberg <
> vanessa at codefrau.net>
> > > wrote:
> > >
> > >>
> > >> I like measuring all-over performance, and not adding any extra work.
> > >>
> > >> Like, DateAndTime is pretty early in the startup list. It could
> remember
> > >> the time its startup was invoked. Another class that comes later
> could set
> > >> a LowPerformance flag if it took longer than x ms since DateAndTime
> was
> > >> initialized.
> > >>
> > >> I just tried that with ProcessorScheduler (see attachment). On Safari
> and
> > >> a 5.3 image I get ImageStartMS = 133 ms, on Chrome 250 ms. On a fast
> VM I
> > >> get 5 ms. So maybe if that takes longer than say 50 ms it could be
> > >> considered low performance?
> > >>
> > >
> > > Works for me. I would record and provide an accessor for
> ImageStartUsecs
> > > (a class variable in SmalltalkImage, using microseconds :-) ).  Then
> one
> > > can either use isLowerPerformance or the actual time for a more
> "nuanced"
> > > view.
> > >
> >
> > Good idea. It also should use class vars not globals, etc.
> >
> > I didn't mean to use this as is, just to do a quick proof of concept.
> And I
> > didn't see Dave's take come through yet ... or are announcements from
> > squeaksource broken?
> >
> > Vanessa
>
> I'm not sure if the inbox announcement came out on email (I did not see
> it either), but my take on this was in System-dtl.1207.mcz in the inbox.
> It uses a value computed once per session on first reference, so it should
> have no effect on startup time.
>
> The actual logic to determine a "slow platform" is this:
>
>   (Time millisecondsToRun:[ 25 benchFib ]) > 200
>       or: [ (Time millisecondsToRun: [ 64 benchmark ]) > 200 ]
>
> Perhaps someone with a Raspberry Pi can check and see if this is
> reasonable? It does indicate that SqueakJS is "slow" when running
> in Chrome on my Linux box, and the compiled VMs are "fast".
>
> Dave
>
>
>
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