On mercredi 12 juillet 2023 22:35:10 CEST [email protected] wrote:
>  MAX MEM ALLOC:            2048 MB

That's not the maximum darktable can use, it's the maximum opencl can get in 
one allocation request (a quarter of the total GPU memory). See e.g.
https://registry.khronos.org/OpenCL/sdk/3.0/docs/man/html/clGetDeviceInfo.html

And of course, there usually are other programs also wanting GPU memory 
(desktop manager, Firefox, ...)

Remco



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