[Qgis-user] excessive threads?

[chris hermansen]

Greg and list

On Sat, Jul 30, 2022 at 10:38 AM Greg Troxel via Qgis-user <
qgis-user at lists.osgeo.org> 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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