darktable and opencl on Fedora with Intel Iris plus

mlaverdiere · April 15, 2022, 8:41pm

Hi,

I’m on Fedora 36 (beta) and I’m trying to activate opencl to use with darktable, with a Intel Iris Plus Graphics (ICL GT2) on a Dell XPS 13 9300

I just installed the intel-opencl package, which seams to be the NEO (version 22.11.22682, so not the old one, beignet) according to what dnf is reporting and based on this site: compute-runtime/DISTRIBUTIONS.md at master · intel/compute-runtime · GitHub

Now, darktable (version 3.8.1) is not starting with the intel-opencl package installed.

Here’s what darktable-cltest is reporting:

[ml@ml-dell-fedora ~]$ darktable-cltest
0.046980 [opencl_init] opencl related configuration options:
0.047001 [opencl_init]
0.047005 [opencl_init] opencl: 1
0.047008 [opencl_init] opencl_scheduling_profile: ‘default’
0.047012 [opencl_init] opencl_library: ‘’
0.047015 [opencl_init] opencl_memory_requirement: 768
0.047019 [opencl_init] opencl_memory_headroom: 300
0.047022 [opencl_init] opencl_device_priority: ‘/!0,//’
0.047027 [opencl_init] opencl_mandatory_timeout: 200
0.047031 [opencl_init] opencl_size_roundup: 16
0.047033 [opencl_init] opencl_async_pixelpipe: 0
0.047036 [opencl_init] opencl_synch_cache: false
0.047039 [opencl_init] opencl_number_event_handles: 25
0.047043 [opencl_init] opencl_micro_nap: 1000
0.047046 [opencl_init] opencl_use_pinned_memory: 0
0.047049 [opencl_init] opencl_use_cpu_devices: 0
0.047051 [opencl_init] opencl_avoid_atomics: 0
0.047054 [opencl_init]
0.047314 [opencl_init] could not find opencl runtime library ‘libOpenCL’
0.047381 [opencl_init] could not find opencl runtime library ‘libOpenCL.so’
0.047613 [opencl_init] found opencl runtime library ‘libOpenCL.so.1’
0.047644 [opencl_init] opencl library ‘libOpenCL.so.1’ found on your system and loaded
Abort was called at 39 line in file:
/builddir/build/BUILD/compute-runtime-22.11.22682/shared/source/built_ins/built_ins.cpp
Abandon (core dumped)

Any clue on how to make it works?

Thanks.

paperdigits · April 15, 2022, 9:04pm

How did you install darktable? dnf, obs repo, flatpak?

g-man · April 15, 2022, 9:10pm

I think the Intel GPU was blacklisted by darktable due to OpenCL issues. I think you can set a flag to enable.

But there current master code has a lot of improvements to OpenCL. And getting more folks willing to test the Intel with it can help remove it from the blacklist.

mlaverdiere · April 15, 2022, 9:34pm

darktable is installed via dnf from regular Fedora repositories.

mlaverdiere · April 15, 2022, 9:54pm

I may be wrong, but according to this post, it seems this was the previous version (beignet) that was blacklisted, not the newest one (NEO): OpenCL and Darktable and Iris Xe? - #3 by garrett

Do you know where I can look to find what is blacklisted by darktable?

g-man · April 15, 2022, 10:10pm

github.com

darktable-org/darktable/blob/master/src/common/opencl_drivers_blacklist.h

/*
    This file is part of darktable,
    Copyright (C) 2016-2020 darktable developers.

    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    darktable is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

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g-man · April 15, 2022, 10:24pm

Windows blacklisted, so that’s not it.

nipsi · April 16, 2022, 8:14am

Does clinfo work for you? I think I have the same issue with Intel HD 520 on fedora 36. Darktable won’t start with opencl (–disable-opencl works fine) and clinfo puts out some info followed by a segfault.

I guess it might have something to do with this issue: ocloc crashes with LLVM 13 #204 - intel graphics compiler.
One of the comments is from the guy maintaining the intel-compute-runtime packages for fedora.

mlaverdiere · April 16, 2022, 10:49am

clinfo is also reporting an error (same as darktable-cltest):

[ml@ml-dell-fedora ~]$ sudo clinfo
Abort was called at 39 line in file:
/builddir/build/BUILD/compute-runtime-22.11.22682/shared/source/built_ins/built_ins.cpp
Abandon

Thanks for pointing me to this bug report. I guess we’ll have to wait for this to be resolved… unless there is some workaround?

jorismak · April 16, 2022, 11:45am

The message is not 'opencl disabled because of blacklisted driver’s though, it crashes when trying to interface with the driver .

hannoschwalm · April 16, 2022, 11:57am

If clinfo does not work, how should dt do?

About the mentioned compiler problem: dt uses the systems default llvm compiler and trusts everything up to 13 as correct.

Also - and probably more important - Fedora 36 is not stable atm. This is one of the errors that can be expected on a beta system as only a few applications make use of OpenCl so a bug might get un-noticed longer than others. Also, the linux kernel used is very fresh and intel regularly contributes with OpenCl and driver fixes.

mlaverdiere · April 16, 2022, 7:31pm

Bug report submitted for Fedora 36: 2075944 – intel-opencl crashes with intel-igc built against LLVM >= 13

… which lead to a confirmation that it is related to this upstream bug: ocloc crashes with LLVM 13 · Issue #204 · intel/intel-graphics-compiler · GitHub

mlaverdiere · April 18, 2022, 1:02pm

OK, while we wait for this bug to be resolved, here’s a temporary workaround to activate opencl on Fedora for Intel cards, based on packages available here: jdanecki/intel-opencl-ci Copr

Tested and working on Fedora 36 (beta) with darktable 3.8.1.

Here’s how to proceed.

#Enable intel-opencl repository
sudo dnf copr enable jdanecki/intel-opencl

#Enable intel-opencl-ci repository
sudo dnf copr enable jdanecki/intel-opencl-ci

#Install the specific working version of intel-opencl package
sudo dnf install intel-opencl-21.38.21026

#Add the following line to /etc/dnf/dnf.conf to exclude these packages from future upgrade so they won’t be replaced with the newest-buggy ones, until the bug is resolved
exclude=intel-opencl intel-gmmlib