32-bit float (single precision). maybe there is an occasional double, but
that should be well < 1%.
j.
On Tue, Jul 9, 2013 at 12:41 PM, Kinslayer von Hellracer <[email protected]
> wrote:
> Does darktable primary needs double precision or single precision
> performance
> when using opencl?
>
> Am Donnerstag, 4. Juli 2013, 23:06:56 schrieb WhizzMan:
> > The hybrid nvidia/intel solution is for laptops and it's not very well
> > supported under linux. I don't think you should see that as an example to
> > openCL with NVidia on linux.
> >
> > As far as closed source drivers go, my PC with radeon 7850 is still
> > crashing the X server when I resize windows that have accelerated things
> > happening inside them often. I don't have an NVidia card that is
> supported
> > by DarkTable for openCL in any of my machines, so I can't comment on
> speed.
> > Regardless of openCL performance of NVidia versus AMD, it will still be a
> > lot faster than the CPU-only solution. I'm impressed with what AMD has
> come
> > up with so far, but it's not stable enough on my personal machine (very
> > small sample size) for me to recommend it to anyone personally. I know
> > NVidia is good enough, but it may indeed be a lot slower than AMD on
> openCL.
> >
> > I'm fairly certain you can use an AMD for openCL and an NVidia card for
> > display simultaneously. Anyone that has experience with this?
> >
> >
> > On Thu, Jul 4, 2013 at 8:26 PM, Kinslayer von Hellracer
> >
> > <[email protected]>wrote:
> > > Thank you for your explanations about your experience. Of course I
> would
> > > like
> > > to avoid such problem by choosing the correct hardware. Therefor I
> would
> > > use a
> > > desktop computer, disable the integrated GPU and just use the PCIe
> > > graphics
> > > card.
> > >
> > > I usually use ArchLinux which always contains the bleeding edge
> software.
> > > I
> > > hope to have a easy solution for OpenCL performance via repository.
> > >
> > > Karsten
> > >
> > > Am Donnerstag, 4. Juli 2013, 10:19:07 schrieb David Vincent-Jones:
> > > > My personal experience with OpenCL has 'not been good'.
> > > >
> > > > I purchased a Lenovo W530 Laptop with a nVidia card, it looked like
> the
> > > > ultimate graphics machine. I found however that I needed to install
> > > > Bumblebee to get OpenGL working and that the system still had
> problems
> > > > with OpenCL. But simple Bumblebee did not allow me to get any VGA or
> > > > other output from the system .. that required a further complex
> install
> > > > process. There are apparently brand new nVidia drivers for my setup
> but
> > > > under xUbuntu they currently appear impossible to install. It is
> > > > possible that under Fedora or Suse there *may* be better support; I
> did
> > > > even consider switching platforms.
> > > >
> > > > It appears that this entire arena is under continuous (and fast)
> > > > development, my hope is that by the end of the year things will be
> more
> > > > simple and stable. It does also appear that on regular 'tower'
> computers
> > > > there are less problems but I want to keep with the portability of a
> > > > high resolution laptop ....
> > > >
> > > > I am sure this is not what you wanted to hear ... it just happens to
> be
> > > > my reality. I have become tired of multiple install and re-install
> > > > sessions so I now run my Super machine in 'plain Jane' mode and
> simply
> > > > look forward to nVidia (or somebody) getting their act together in
> the
> > > > near future.
> > > >
> > > > David
> > > >
> > > > On 13-07-04 08:56 AM, Kinslayer von Hellracer wrote:
> > > > > Hi all,
> > > > >
> > > > > I'm thinking of a new PC because my old laptop is really slow.
> > > > > Therefor I would like to spent some money to get a fast computer.
> As
> > > > > I read the old thread from darktable mailing list OpenCL can
> generate
> > > > > much more speedup than a fast CPU. As I read last benchmarks it
> seems
> > > > > like the nVidia OpenCL performance is really bad at the moment.
> > > > > Otherwise I was always sure that AMD has bad Linxu support.
> > > > >
> > > > > So does anyone knows which hardware would be better to use? nVida
> or
> > > > > AMD graphics card? Does darktable support more than one graphics
> card
> > > > > for OpenCL usage? Or could darktable use some co-processors like
> the
> > > > > nVidia Tesla for OpenCL calculations?
> > > > >
> > > > > How good is the darktable performance for multi threading? I
> checked
> > > > > some dual socket workstations with 2 CPUs (Intel Xeon). Could
> > > > > darktable use 12 or 16 physical CPU Cores?
> > > > >
> > > > > I would be happy to have some information about this.
> > > > >
> > > > > Thanks
> > > > >
> > > > > Karsten
> > >
> > >
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