On Wed, 23 Jan 2019 12:42:46 -0500 Leander Hutton <lean...@one-button.org> wrote: > > I'm running multiple AMD GPUs with a 2950X on Fedora 29 with the > amdgpu/mesa drivers on just the OpenCL portions of AMD's binary > drivers installed. I started off with a hand-me-down Radeon Pro > WX7100 that I ran until I found a Vega 56 on sale during the > holidays. I left the WX7100 in my box for a couple of reasons, one of > one being to use with OpenCL. The Radeon Pro is basically the > workstation version of an RX 480 or 580 I think so it's not too far > off from the RX 470. I've not had any issues out of it and I'm just > using the default "multiple GPU" setting in Darktable. I didn't think > to run benchmarks before and after but I"ve not had any issues out of > the setup. I need to go in and make sure the Vega is getting set as > the default card at some point. But it's plenty fast and definitely > faster than OpenCL disabled, no display problems or bugs so far ... > Nice to hear. You definitely should not use multiple GPU unless both cards are identical. If they are not identical you should prioritize the cards this way: 1) Fastest/best GPU 2) GPU with the most on-board memory
So if darktable -d opencl shows: [opencl_init] device 0 `WX7100` [opencl_init] device 1 `Vega 56` This means: 1) OpenCL scheduling profile -> default 2) opencl_device_priority !WX7100,*/!Vega 56,*/Vega 56,*/Vega 56,* Above means: exclude using WX7100 for center image, exclude Vega 56 for preview, export prefer Vega 56, thumbnails prefer Vega 56. > I guess I could just disable one card in the darktablerc file with > opencl_device_priority instead of yanking one of the cards out? If > it's that quick and easy can try to do some comparisons this week. > Following the above to exclude WX7100 completely: opencl_device_priority !WX7100,*/!WX7100,*/!WX7100,*/!WX7100,* or exclude Vega 56 completely opencl_device_priority !Vega 56,*/!Vega 56,*/!Vega 56,*/!Vega 56,* -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael <at> rasmussen <dot> cc http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xD3C9A00E mir <at> datanom <dot> net http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE501F51C mir <at> miras <dot> org http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE3E80917 -------------------------------------------------------------- /usr/games/fortune -es says: "Is it really you, Fuzz, or is it Memorex, or is it radiation sickness?" -- Sonic Disruptors comics
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