Hi,
Am 2017-01-16 11:51, schrieb Michael Below:
Hi,
I think that line about AMD not being supported at all by current
Linux distros is a bit misleading, AFAIK you need to install the
AMDGPU-PRO driver available on their homepage (for Ubuntu and RH).
NVidia offers a more streamlined installation process for a wider
range of distros.
That's correct! As I've written, it seems that AMD drops support for
older models earlier.
I only want to point out that one has to check driver support carefully.
There was one previous report on the list about an OpenCL GPU being
slower than a CPU, I think that involved an old NVidia card paired
with a new i7 CPU. For myself, OpenCL does speed things up
considerably (old AMD Phenom II X4 810 CPU, Nvidia 750Ti card).
There were a number of reports and discussions in conjunction with
Nvidia cards.
Some operations or better moduls like Equalizer and profiled denoise
took way longer
on GPU than CPU. In my case it was a Nvidia GT640 vs. i7-2600. I bought
the card for
darktable only. Different OpenCL settings didn't helped. I also had a
slugish ton curve.
These are just personal experiences.
About the memory issue: I think darktable can use multiple buffers
inside OpenCL.
Cheers
Michael
Christian
-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]]
Gesendet: Montag, 16. Januar 2017 11:32
An: [email protected]
Betreff: Re: [darktable-user] what graphics card to get?
Here's a summary of the information gathered so far. It's not really
exhaustive!
Patrick Rudin:
* Suggests NVidia 1050, 1050Ti or 1060.
* AMD seems not to be supported *at all* by current Linux distros.
* Would also like to know about memory requirement.
Christian Kanzian:
* cheap card can be slower than the CPU. [contradicts Guillermo
Rozas below]
* AMD Radeon R9 270X supported under Debian 8, but not any more
under Debian 9, since AMD stopped support in proprietary driver.
Planning to turn to NVidia.
Guillermo Rozas:
* runs DT on an intel i7-4720HQ notebook with an Nvidia 960M 4GB,
under Ubuntu 16.10. CUDA is fully supported by the proprietary
drivers, and DT uses the GPU without issues.
* any supported GPU will give massive performance improvement.
[contradicts Christian Kanzian above]
* get as much memory as possible [contradicts following point]
* DT cannot use buffers larger than 1.5GB [contradicts previous
point]
David Vincent-Jones:
* There seems to be a problem with color management and NVidia.
Using a more current version of DisplayCAL/ArgyllCMS seems to
solve the problem.
Maybe the devs want to add some more information?
That was my original question:
On 2017-Jan-13, Stefan Klinger wrote with possible deletions:
Hello,
what graphics card to get for using Darktable with OpenCL under Linux?
I already have an Asus M5A97 evo R2 mainboard, with an PCIe 2.0 x16
slot for the graphics card. I want to stay in the price range below
200€. I do not play games, nor do I use 3D graphics software of any
kind. Darktable will be the most demanding task for this piece of
hardware.
The Darktable manual mentions a minimum of 1GB of graphics memory to
be sufficient [1]. Is this up-to-date information? Does DT benefit
from more more? How much more?
There seem to be different versions of OpenCL [2]. Is that an issue
when deciding which card to buy? What does Darktable need here?
NVidia graphics cards seem to differ in “compute ability”, which seems
to be the CUDA version [3] they support. What is required here for
Darktable? Is there something similar to look out for with AMD Radeon
cards?
The manual [4] mentions “recent” AMD Radeon HD7xxx to work out of the
box. According to Wikipedia [5] that series was introduced in 2011
and had its latest update in 2013. Also, it seems to be difficult to
buy any of these now (I don't want to buy used hardware). Is there
more current information available?
Does anyone have information on / experience with Radeon R7 or similar
(i.e., GCN family of cards [6])? They seem to be available for under
100€ currently [7].
A list of NVidia GPUs with CUDA-support (I guess that's required for
OpenCL on NVidia) is here [10].
Most graphics cards I've seen are not actually built by AMD or NVidia,
but rather by 3rd party manufacturers (MSI, ASUS, Palit, Zotac,
Gainward, Gigabyte, PNY, ...) using their GPUs. Is there any
particularly good / bad one to choose?
What else to pay attention to?
Thanks for helping
Stefan
BTW: The link “darktable user mailing list” [8] on [9] is outdated.
____________________
[1] http://www.darktable.org/usermanual/ch10s02s03.html.php
[2] https://en.wikipedia.org/wiki/OpenCL
[3]
https://en.wikipedia.org/wiki/CUDA#Version_features_and_specifications
[4] http://www.darktable.org/usermanual/ch10s02s06.html.php
[5] https://en.wikipedia.org/wiki/Radeon_HD_7000_Series
[6] https://en.wikipedia.org/wiki/Radeon#Graphics_Core_Next-family
[7] https://www.heise.de/preisvergleich/?fs=Radeon%20R7&cat=gra16_512
[8]
http://www.darktable.org/resources/[email protected]
table.org [9] http://www.darktable.org/resources/
[10] https://developer.nvidia.com/cuda-gpus
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