It causes darktable 2.0.5 (Fedora) to crash. Switching back to false cures the problem. So please don't change.
On Wed, 14 Sep 2016 at 17:56 Ulrich Pegelow <[email protected]> wrote: > Well, there obviously is an issue with OpenCL and NVIDIA. However, a > quick check reveals that this is not related to 2.0.6 versus 2.0.5. > > In fact it seems that NVIDIA did some changes to their drivers in the > way they handle memory transfers over the IDE interface. > > There is a quick fix for that in darktable. You can switch config > variable opencl_use_pinned_memory to TRUE (can be found in darktablerc). > At least here on my this makes a difference of up to a factor of 30 > (oldish GeForce GTS 450 and 367.35 driver). > > Background: that switch controls the way of memory transfer between host > and OpenCL device, namely the use of pre-pinned memory. When the flag > was introduced it did only make some improvements on AMD/ATI devices, > while at that time NVIDIA devices would show no or a slight negative > effects. Therefore the flag is set to FALSE by default. It seems that > newer NVIDIA drivers get extremely slow if the default non-pinned memory > transfer method is used. > > If my findings are confirmed we will change the default setting of that > flag for new installations. Users of existing installations will need to > change the config flag manually. > > Please check and report back. > > Ulrich > > Am 14.09.2016 um 00:47 schrieb I. Ivanov: > > I find it strange... > > > > When I upgraded from 14.04 to 16.04 - DT was at version 2.0.5 and nvidia > > 361. I actually experienced speed "gain" - did not clock it but it was > > very noticeable. I worked in this state for several weeks - all happy, > > no changes in settings to DT. > > > > 2.0.6 was installed on 2016-09-06. I noticed it works but did not test > > any further. Then I didn't use the computer till 11th. Installed the > > following updates > > > > 2016-09-11 19:56:16 status installed gnome-menus:amd64 3.13.3-6ubuntu3.1 > > 2016-09-11 19:56:16 status installed desktop-file-utils:amd64 > 0.22-1ubuntu5 > > 2016-09-11 19:56:17 status installed mime-support:all 3.59ubuntu1 > > 2016-09-11 19:56:17 status installed bamfdaemon:amd64 > > 0.5.3~bzr0+16.04.20160701-0ubuntu1 > > 2016-09-11 19:56:17 status installed man-db:amd64 2.7.5-1 > > 2016-09-11 19:56:18 status installed libc-bin:amd64 2.23-0ubuntu3 > > 2016-09-11 19:56:18 status installed dbus:amd64 1.10.6-1ubuntu3 > > 2016-09-11 19:56:18 status installed gconf2:amd64 3.2.6-3ubuntu6 > > 2016-09-11 19:56:18 status installed hicolor-icon-theme:all 0.15-0ubuntu1 > > 2016-09-11 19:56:18 status installed libglib2.0-0:i386 > > 2.48.1-1~ubuntu16.04.1 > > 2016-09-11 19:56:18 status installed libglib2.0-0:amd64 > > 2.48.1-1~ubuntu16.04.1 > > 2016-09-11 19:56:18 status installed sgml-base:all 1.26+nmu4ubuntu1 > > 2016-09-11 19:56:19 status installed google-chrome-stable:amd64 > > 53.0.2785.101-1 > > 2016-09-11 19:56:19 status installed libp11-kit0:amd64 > > 0.23.2-5~ubuntu16.04.1 > > 2016-09-11 19:56:19 status installed libp11-kit0:i386 > 0.23.2-5~ubuntu16.04.1 > > 2016-09-11 19:56:19 status installed p11-kit-modules:amd64 > > 0.23.2-5~ubuntu16.04.1 > > 2016-09-11 19:56:19 status installed libaccountsservice0:amd64 > > 0.6.40-2ubuntu11.2 > > 2016-09-11 19:56:19 status installed accountsservice:amd64 > > 0.6.40-2ubuntu11.2 > > 2016-09-11 19:56:19 status installed file-roller:amd64 3.16.5-0ubuntu1.2 > > 2016-09-11 19:56:19 status installed gnome-font-viewer:amd64 > 3.16.2-1ubuntu1 > > 2016-09-11 19:56:19 status installed libappstream-glib8:amd64 > > 0.5.13-1ubuntu3 > > 2016-09-11 19:56:19 status installed libimlib2:amd64 1.4.7-1ubuntu0.1 > > 2016-09-11 19:56:19 status installed metacity-common:all > 1:3.18.7-0ubuntu0.1 > > 2016-09-11 19:56:19 status installed libmetacity-private3a:amd64 > > 1:3.18.7-0ubuntu0.1 > > 2016-09-11 19:56:19 status installed libnm-gtk-common:all > > 1.2.0-0ubuntu0.16.04.4 > > 2016-09-11 19:56:19 status installed libnm-gtk0:amd64 > 1.2.0-0ubuntu0.16.04.4 > > 2016-09-11 19:56:19 status installed libnma-common:all > > 1.2.0-0ubuntu0.16.04.4 > > 2016-09-11 19:56:19 status installed libnma0:amd64 1.2.0-0ubuntu0.16.04.4 > > 2016-09-11 19:56:19 status installed network-manager-gnome:amd64 > > 1.2.0-0ubuntu0.16.04.4 > > 2016-09-11 19:56:21 status installed snapd:amd64 2.14.2~16.04 > > 2016-09-11 19:56:21 status installed p11-kit:amd64 0.23.2-5~ubuntu16.04.1 > > 2016-09-11 19:56:21 status installed libc-bin:amd64 2.23-0ubuntu3 > > > > and noticed drop in performance - mainly when using darktable (not much > > light table). Took a chance to turn off open CL and the performance > > improved. After reading the thread > > > > > https://www.mail-archive.com/[email protected]/msg01176.html > > > > Tried to compare with export of a single image. > > without open CL - 23s for about 20 MB RAW. > > Same image - no change > > with open CL - 41s > > > > The OS and the images are stored on SSD so the networking does not come > > into play. > > I can work without open CL - it is not a deal breaker but the behavior > > is surprising. > > > > Regards, > > B > > > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to > [email protected] > > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
