If I have time tonight I'll try to run some benchmarks.

But, subjectively, my Radeon 7750 performs well for dt, isn't too expensive and 
is silent.  There are much faster cards of course.

Rob.

-----Original Message-----
From: thouks [mailto:[email protected]]
Sent: 21 May 2013 08:14
To: [email protected]
Subject: Re: [Darktable-users] Lightable performance tuning

I made some benchmarks with and without opencl activated.

My setup:
core i5-2500, 16GB, GeForce GT 640 (2GB) Ubuntu 13.04, Gnome Shell (3.8), 
Nvidia 310.44, git-Master


What I did:
Load from Lighttable in Darkroom
Processing Shadows¬Highlights (default)
Back to Lightroom
Export as full size jpeg (100%)

P1020413.RW Lighttable -> Darkroom              Opencl on                       
Opencl off
                                                        [s]     cpu[s]  [s]     
cpu[s]
[dev_process_image] pixel pipeline processing           0,022   0,032           
0,42    1,216
[dev_process_preview] pixel pipeline processing 0,097   0,228           0,107   
0,228

Shadows & Highlights

[dev_process_preview] pixel pipeline processing 0,284   0,448           0,208   
0,596
[dev_process_image] pixel pipeline processing           0,371   0,5             
  0,242 0,652

Darkroom -> Lighttable

[dev_process_thumbnail] pixel pipeline         0,087    0,072           0,051   
0,096

Export

[export] creating pixelpipe                                               0,136 
0,164           0,137   0,172
[dev_process_export] pixel pipeline processing   1,02   0,46             1,189  
3,512


Maybe we can compare some benchmark results to find a graphics card with a good 
price/ perfomance balance.
Probably there is a better way to benchmark with darktable.


For comparable results:
https://dl.dropboxusercontent.com/u/352146/P1020413.RW2


regards


Am 20.05.2013, 23:07 Uhr, schrieb Ulrich Pegelow <[email protected]>:

> can't make any benchmarks right now (holiday time :)
>
> Anyhow, what is your setting on the number of background jobs in core
> options?
>
> Ulrich
>
> Am 20.05.2013 um 22:23 schrieb Emmanuel Lacour <[email protected]>:
>
>> On 19/05/2013 22:21, Ulrich Pegelow wrote:
>>> Hi,
>>>
>>> as a highly performant OpenCL device consider a Radeon HD7950 or
>>> better.
>>
>>
>> before I spent so much money in this, can someone share the average
>> thumbnail generation time (from raw, not from embedded jpeg)
>> difference with and without such card?
>>
>>
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