On Wed, Jun 5, 2013 at 1:08 AM, Roumano <[email protected]> wrote:
> Hi,
>
> (Only) just now (with the new ati-drivers 13.6) , I can enable the
> opencl on darktable
>
> [opencl_init] device 0 `Tahiti' supports image sizes of 16384 x 16384
> [opencl_init] device 0 `Tahiti' allows GPU memory allocations of up to
> 1024MB
> [opencl_init] device 0: Tahiti
> GLOBAL_MEM_SIZE: 1845MB
> MAX_WORK_GROUP_SIZE: 256
> MAX_WORK_ITEM_DIMENSIONS: 3
> MAX_WORK_ITEM_SIZES: [ 256 256 256 ]
> DRIVER_VERSION: 1214.3 (VM)
> DEVICE_VERSION: OpenCL 1.2 AMD-APP (1214.3)
> ...
> discarding CPU device 1 `Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz' as it
> will not deliver any performance gain.
>
>
> The result is realy great, for a picture-exemple-test, exporting it
> (with lot of big treatement like sady/denoise)
> before : 29,837 secs (202,660 CPU)
> after : 8.412 secs (10.730 CPU)
>
> So, we can really see improvement about speed & reactivity (as it's use
> very less the CPU)
>
>
> 1) But some plugin are more slower on the GPU than on the CPU :
> it's not a fallback mode to CPU :
> [opencl_summary_statistics] device 'Tahiti': 1468 out of 1468 events
> were successful and 0 events lost
>
>
> Test with
> 1.2 :
> cpu [dev_pixelpipe] took 0.347 secs (1.789 CPU) processing `raw
> denoise' [export]
> gpu [dev_pixelpipe] took 0.432 secs (1.852 CPU) processing `raw
> denoise' [export]
> cpu [dev_pixelpipe] took 0.318 secs (0.310 CPU) processing
> `watermark' [export]
> gpu [dev_pixelpipe] took 0.476 secs (0.582 CPU) processing
> `watermark' [export]
> cpu [dev_pixelpipe] took 0.029 secs (0.205 CPU) processing
> `gamma' [export]
> gpu [dev_pixelpipe] took 0.033 secs (0.232 CPU) processing
> `gamma' [export]
> Devel :
> cpu [dev_pixelpipe] took 0.317 secs (1.638 CPU) processing `raw
> denoise' [export]
> gpu [dev_pixelpipe] took 0.371 secs (1.642 CPU) processing `raw
> denoise' [export]
> cpu [dev_pixelpipe] took 0.205 secs (0.199 CPU) processing
> `watermark' [export]
> gpu [dev_pixelpipe] took 1.351 secs (2.157 CPU) processing
> `watermark' [export]
> cpu [dev_pixelpipe] took 0.024 secs (0.175 CPU) processing
> `gamma' [export]
> gpu [dev_pixelpipe] took 0.024 secs (0.186 CPU) processing
> `gamma' [export]
>
>
> 1.1 ) Specialy for the waterwark (where it's a big difference between
> 1.2 & the devel version)
>
watermarks are rendered using librsvg, i think even on a single core, there
is definitely no opencl for this.
j.
>
>
> 2) Also, i was needed to change the parameter opencl_memory_headroom to
> 350 ( default 300 ) to prevent this kind of error when use the equalizer
> module :
>
> default_process_tiling_cl_ptp] use tiling on module 'atrous' for image
> with full size 3374 x 5064
> [default_process_tiling_cl_ptp] (1 x 3) tiles with max dimensions 3374 x
> 2726 and overlap 256
> [default_process_tiling_cl_ptp] tile (0, 0) with 3374 x 2726 at origin
> [0, 0]
> [opencl_atrous] couldn't enqueue kernel! -4
> [default_process_tiling_opencl_ptp] couldn't run process_cl() for module
> 'atrous' in tiling mode: 0
> [opencl_pixelpipe] failed to run module 'atrous'. fall back to cpu path
> [dev_pixelpipe] took 7.192 secs (37.128 CPU) processing
> `equalizer' [export]
> [opencl_pixelpipe] couldn't copy image to opencl device for module
> tonecurve
> [opencl_pixelpipe] failed to run module 'tonecurve'. fall back to cpu
> path
> [opencl_pixelpipe (b)] late opencl error detected while copying back to
> cpu buffer: -4
>
> 3) To prevent regression & catch worse performance, we can imagine a
> test script which will enable nearly all modules then export one file (&
> the same without opencl) then report it on a graph ?
> i don't known how & if it's realy hard to do that ... (lua ?)
> about it, i was thinking about the job done by firefox :
>
> http://arewefastyet.com/
> https://areweslimyet.com/
>
>
>
> Regards
>
>
>
>
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