> If you have two GPUs with the same speed, it makes a lot of sense to set
> parallel_export to 2. However, in most cases users have only one GPU
> that is often much faster than the CPU. Or few people have two GPUs with
> a big performance difference. In these cases you only profit from
> multiple parallel export threads, if you export *many* images in one
> step. In case of few images to export you always need to wait until the
> slowest device is finished and it often be faster to process all of them
> on the fastest device only.

Ok, understand

> @Jerome: what was said before, only should affect the speed. In your
> case it seems that export hangs at some point. You should start
> darktable with option '-d opencl' to see what happens. If you share that
> debug output here we might be able to help.

I will do it as soon as possible

> Does your system completely freeze? The power supply of your computer
> needs to be strong enough to feed two GPUs in parallel. If not, voltage
> will drop and you may get a hardware crash.

No, system run without problem. Even darktable react. Just export job hang.

Thanks

-- 
Jérôme FAU

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