The problem really starts when the thread is blocked for any reason. A lot of times we hear VoiceOver telling that a certain app is not responding, when it is actually all right and going good. So yes you are right, the analogy other way round (which is what from the waiter’s point ov view being alone) is correct, if there is one output system and only one person to hear, then it’s a problem and it is so in Mac OS with voice over. The other way people solve this issue is by making the function calls asynchronous. But this won’t help systems like VO because the audio has to be serial. Regards.
> On 30 Jun 2025, at 10:12 PM, Doug Lee <[email protected]> wrote: > > I have always figured that a single thread would be enough for handling > speech output, simply because the > output itself is serial in nature. I would, however, think that this single > thread should be a thread unto > itself and not the same as an application main thread. In your analogy, there > is only one microphone by > which an order can be relayed from the customer counter to the cooks in the > back. In that case, adding more > customer service people really won't help much, because they will each then > have to wait for a free moment > on the mic to say something. To make this as similar to our real case as > possible, customers convey their > orders by entering them on devices that place the requests on a back-facing > screen for the customer service > person, or persons, to read. It's fine for there to be five devices, but the > amount of work required to read > a device aloud is so small as not to warrant having five people to do it. I > say this is parallel to our > actual case, because the work required to request that a phrase be spoken is > similarly small as far as I > know. > > On Mon, Jun 30, 2025 at 09:22:11PM +0530, Krishnakant Mane wrote: > So here’s a simple analogy. > You are in a hotel and want to order something. > There are other customers too. > There is only one waiter and he is busy taking some order. > Until he finishes taking that order you will not be able to place yours. > Meaning one task has to complete before other comes in. > So everyone is in queue . > But if there are more than one voters then you have a fair chance of giving > your order as well at the same time. > Also imagine from the waiter’s end, Until he takes the first order, he is > not going to listen to you, rather he will not be able to. > So in this case Voice over is in that same situation. > There are quick inputs coming to VoiceOver from several apps, many actions in > that app and other stuff. > If tasks happen very fast then VoiceOver is able to take the next set of > commands and process them very quickly. > But a few micro seconds here and there and a lag is obvious. > If this propagates then those micro seconds will build up and at the end vo > is going to be very very angry and go on a strike (I can’t take these many > orders at once ). > But if VO works in multiple threaded mode, meaning it can spin two or more > vaiters at a time (this usually is default case with all apps because they > can use multiple processors or some other technique ), then it can take in > more orders and work fast and efficient. > Right now that’s not the case so quick switching of apps and having less > processing power will make it slow. > Imagine a difference between m1 and m3 as the space between tables for the > waiter to pass. > If it is narrow then waiter will take more time to reach other tables, add to > the fact that he is alone. > Now I hope you get it. > Regards. > > >> On 30 Jun 2025, at 8:54 PM, E.T. <[email protected]> wrote: >> >> Please explain single threaded. Appreciate it. >> >> >> From E.T.'s Keyboard... >> Reality.sys corrupted. Universe halted. Reboot(Y/N) ? >> >> My e-Mail: >> [email protected] >> >> On 6/30/2025 8:14 AM, Krishnakant Mane wrote: >>> It is highly possible because M1 is a bit old for this OS. >>> Add to it the fact that VoiceOver is still single threaded. >>> I don’t face this on M3 with 16 gb ram at all, so I guess it’s the >>> performance lag plus the single threaded nature. >>> Regards. >>> >>>> On 30 Jun 2025, at 7:47 PM, 'Andrew' via MacVisionaries >>>> <[email protected]> wrote: >>>> >>>> Hi, >>>> >>>> Sincee the latest update to Sequoia 15.5, Voiceover often crashes >>>> unexpectedly. I lose speech and I have to restart Voiceover or even >>>> brutally shut down my macbook air and reboot in order to regain voiceover >>>> functionality.. Has anybody else experienced this behaviour? I am not >>>> sure what causes it but sometimes I have a feeling that if I do something >>>> quickly on my macbook air like switch from one application to another, or >>>> open and close a Mail message quickly, this might result in Voiceover >>>> crash. >>>> >>>> Andrew > > -- > Doug Lee [email protected] http://www.dlee.org > "Sometimes I think my learning curve is a circle." -- David Andrews > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor. 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