Hi Ulrich, I'm chiming in here in with my question. I want to ask if there's something else that influences dt's decision on accepting a GPU's OpenCL capacities. I have a GPU with only 255MB, and yes I know it's very low, I've set opencl_memory_requirement to 255 (same with 254), but dt still deactivates OpenCL "due to insufficient global memory". Setting host_memory_limit to sth lower than 255 has the same result.
$ darktable -d opencl
[opencl_init] trying to load opencl library: '<system default>'
[opencl_init] opencl library 'libOpenCL' found on your system and loaded
[opencl_init] found 1 devices
[opencl_init] discarding device 0 `Quadro FX 570M' due to
insufficient global memory (255MB).
[opencl_init] no suitable devices found.
[opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is OFF.
I want to test OpenCl because my CPU is also rather slow (I need to set
host_memory_limit for tiling to 1000MB, which results in damned slow
operations.
Sebastian
On 2012-12-09 16:12, Ulrich Pegelow wrote:
> Am 09.12.2012 15:16, schrieb Pascal Obry:
>> I have:
>>
>> $/opt/darktable/bin/darktable -d opencl
>> [opencl_init] trying to load opencl library: '<system default>'
>> [opencl_init] opencl library 'libOpenCL' found on your system and loaded
>> [opencl_init] found 2 platforms
>> [opencl_init] found 2 devices
>> [opencl_init] discarding CPU device 0 `Intel(R) Core(TM)2 Extreme CPU
>> Q9300 @ 2.53GHz' as it will not deliver any performance gain.
>> [opencl_init] device 1 `Quadro FX 770M' doesn't have sm_20 support.
>> [opencl_init] discarding device 1 `Quadro FX 770M' due to insufficient
>> global memory (511MB).
>> [opencl_init] no suitable devices found.
>> [opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
>> [opencl_init] initial status of opencl enabled flag is OFF.
>>
> 511MB is rather low for an OpenCL device. darktable normally wants to
> have 1GB else it will discard the device. There is a configuration
> variable opencl_memory_requirement in
> $HOME/.config/darktable/darktablerc. Set this to 500 and try your luck.
>
> Don't be disappointed if it doesn't work well. A decent CPU will be
> better than a slow GPU (or one with low amounts of memory).
>
> Ulrich
>
>
>> So, this time it looks like a dead-end, right? Not enough memory on my
>> graphic card (Notebook DELL M4400, with Nvidia FX 770M) :(
>>
>> Pascal.
>>
>
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