I see, thanks for the clarification. I wonder if it could be possible for future development to still implement multi gpu export.
Imagine this: 2 GPUs working in parallel each one on one photo but the writing to the disk is done sequentially, while the stack is kept in RAM until it is written to the disk. This could significantly increase export speed in case the system ha a lot of RAM and a fast SSD. Maybe it is impossible to write to RAM in parallel also? (I have limited knowledge on RAM and SSD hardware barriers) On Fri, Jul 20, 2018 at 12:23 PM, Remco Viëtor <remco.vie...@wanadoo.fr> wrote: > On vendredi 20 juillet 2018 12:01:21 CEST Goran Radunovic wrote: > > Is it possible to use multiple GPUs in parallel while exporting? For > > instance, I have 3 GPUs in my system and only the primary is used for > > export although openCL is configured for multiGPU. > > > > Multi GPU is working fine while editing, but in theory export could be > > faster if all of the GPUs are utilized? > > According to the manual, darktable uses several pixel pipelines, each able > to > use up to one GPU. Several pipelines are/can be active in edit mode: > - small preview > - main view > - miniatures (and perhaps others) > So that means that in darkroom mode, several GPUs can be used. > > I understand that a single pipeline can use at most one GPU. This is not > as > bad as it seems (unless treatment is very long), as writing the results to > file > will be the slowest step, and writing multiple files in parallel isn't > possible > (interleaved, yes, but that's something else). > > But you can set which GPU(s) should be used for each pixel pipe (see > manual > section 10.2.9), allowing the most powerful GPU to be reserved for export > (the > most demanding pipe) > > Remco > ____________________________________________________________ > ________________ > darktable user mailing list > to unsubscribe send a mail to darktable-user+unsubscribe@ > lists.darktable.org > > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
