[QGIS-Developer] [Qgis-psc] QGIS and Qt 6: A proposal

[Tim Sutton]

Hi

> On 6 Jul 2020, at 23:54, Nyall Dawson <nyall.dawson at gmail.com> wrote:
> 
> On Tue, 7 Jul 2020 at 07:21, Tim Sutton <tim at kartoza.com> wrote:
> 
>> For the macOS side of this, I wonder if things are quite so urgent. I think the first ARM (‘Apple Silicon’) based machines are going to be out this year, but it will be a two years before their product line is fully transitioned. macOS 11, as I understood things, will ship with Rosetta which will do a direct binary translation to ARM byte code, even if the binary does not ship with ARM binaries (e.g. as a Universal Binary). In the last episode of the ubuntu podcast (https://ubuntupodcast.org/2020/07/02/s13e15-vertical-chopsticks/) they discussed it a bit - probably worth a listen… I heard that the Rosetta overhead is around 25% on current development environments - probably the overhead will be reduced as the release approaches. Anyway, its good you are planning for the future, but I don’t think that macIS users are going to be left high and dry with upcoming changes…..hope I am note wrong :-)
>> 
> 
> That's fair enough. I still think we should permit Qt 6 builds as soon
> as possible, for all the other reasons I listed :)

Yup, 100% agreed


> 
> I'd also like to point out that 25% is quite a drop in performance (I
> get pissed off whenever I see my system performance drop a few percent
> due to the latest Intel incompetence!!). I can only imagine that our
> mac users will be quite...  ummm... "demanding" that we get native
> support available for their platform as soon as this hardware retails!

Yeah I think the final performance hit should be much less given that those numbers are very early development tooling releases. I also predict that  William and Peter will save us from a situation where we have to worry about it :-P Then the other worry will be how big Universal Binaries will be - the macOS DMG is already weighing in at 750mb+ and I hope the UniversalBinary doesn’t push it north of 1gb….

Regards

Tim

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—












Tim Sutton

Co-founder: Kartoza
Honorary PSC Member and Ex-Project chair: QGIS.org <http://qgis.org/>

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