https://bugs.kde.org/show_bug.cgi?id=426175

--- Comment #28 from caulier.gil...@gmail.com ---
Hi Marcel,

The problem is not directly in dnnfacedetectorssd. Look well the back-trace.
All continue in low level inside... OpenCV API. The memory problem is at this
place.

This is what we suspect since a while: the big puzzle named OpenCV as too many
way to optimize computation / process/ data management, using hardware, as GPU.

I'm in contact with team from KDenlive project (video montage application)
which use also OpenCV in background with the same problem.

The solution is to disable optimizations at OpenCV compilation. I do it for all
bundles, but it's not possible for native digiKam version where we don't have
control of OpenCV configuration.

So the ultimate solution is to find a real solution in digiKam code to prevent
this memory leak. The problem is to find the context where this dysfunction
appear, and it's certainly sue to compilation option in OpenCV, as, i never
reproduce this memory leak on all Linux version installed in my computer since
many year. This want mean that OpenCV here is compiled without a specific
optimization. The Q is which one?

If you look in OpenCV CMake top level options, you will see a very huge list of
possibility. It's completely crazy...   

This is what's i use for the bundles :

https://invent.kde.org/graphics/digikam/-/blob/master/project/bundles/3rdparty/ext_opencv/CMakeLists.txt#L11

Another possibility, is a problem with a specific kernel option or a GPU driver
bug, used indirectly by OpenCV. Here again, the complexity to found the reasons
is similar to the distance which separate the sun and the earth.

Gilles

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