Mike and list, Mike, would you please explain why the surface area would be related to the number of threads?
1000 square miles or ~ 250.000 hectares in my units is big but not huge. We have a 7 million hectare vegetation inventory we're updating now. Do you have a bunch of small tiles? Are you thinking that 1 tile = 1 thread? On Sat, Jul 30, 2022, 12:46 Mike Stanton <[email protected]> wrote: > Chris, it really depends on how large your project is. Some of my projects > cover 1000 sq miles. Usually I don’t use QGIS directly for that, I break > it down to smaller pieces. > > > > *From:* Qgis-user <[email protected]> * On Behalf Of *chris > hermansen via Qgis-user > *Sent:* Saturday, July 30, 2022 2:37 PM > *To:* Greg Troxel <[email protected]> > *Cc:* qgis-user <[email protected]> > *Subject:* Re: [Qgis-user] excessive threads? > > > > Greg and list > > > > On Sat, Jul 30, 2022 at 10:38 AM Greg Troxel via Qgis-user < > [email protected]> wrote: > > > (I realize excessive is relative. Back when I was young, we didn't have > any threads at all....) > > My desktop is NetBSD 9, I ran out of threads, and found that qgis 3.22.8 > was using 157 threads, much more than I expected. > > > > [stuff deleted] > > > I really don't understand: > > What is qgis using threads for? > > Do others see large (100 or so, vs 10) thread counts? > > Why are there 157 (really, why are there more than about 10-20)? > > Seems kind of surprising to me as well. I get that some applications > could benefit by parallel execution, and of course separating rendering > from file or other I/O seems reasonable, but 157 is a lot of threads for > just reading data and visualizing it. > > > > As far as I know, PostgreSQL doesn't even use threads. See for example > this discussion > https://dba.stackexchange.com/questions/251935/number-of-worker-threads-available-in-postgresql > > > > About SQLite I have no idea. > > > > Does it seem like you have one thread per layer for reading plus one for > rendering plus one for user input? > > > > -- > > Chris Hermansen · clhermansen "at" gmail "dot" com > > C'est ma façon de parler. >
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