Hi Guillaume,
A 5% progress after 5 days still sounds extremely slow! That would take
approximately 100 days to finish on 1 core, or 2 days (72 hours!) on 32
cores.
I don't know how large or complicated these shapefiles are, but you
might try to find the solution in another way.
- Make sure you are using indexes?
- Select non-overlapping shapes and delete them?
- Split the files in parts?
- Move to Postgis? (Am I allowed to suggest that here? ;) )
@Marco Shouldn't that code end up in QGIS or is it still in your repo
for a reason?
Kind regards,
Raymond
On 22-10-2020 07:20, Marco Hugentobler wrote:
Hi Guillaume
>My question: Is there a way to take advantage of the fact that I have
32 cores on my computer with QGIS to make this calculation? I don't
understand why it is so slow.
Yes, there is. Compile the code from the
'processing_multithreaded_vector' branch in my repo
(https://github.com/mhugent/QGIS/tree/processing_multithreaded_vector).
It calculates the difference operation on multiple cores (see also
https://github.com/qgis/QGIS/pull/33365).
Regards,
Marco
Am 22.10.20 um 03:05 schrieb guillaume martel:
Hi,
I don't know if I'm writing at the wrong place...
I have 2 shapefiles and I want to do a "difference operation"
(https://docs.qgis.org/3.10/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html).
My issue is as follow: Even though I have a powerful computer, after 5
days the calculation is only at 5%.
My question: Is there a way to take advantage of the fact that I have
32 cores on my computer with QGIS to make this calculation? I don't
understand why it is so slow.
Thank you for your help.
Guillaume
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Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
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