OK, it seems that preview processing cannot be avoided, at least for now.
But would it be possible to let it process on the opencl device instead of
the much slower CPU while keeping processing full pixelpipe on opencl too.
It means to let process full and preview in sequence, not in parallel? It
should improve the responsiveness of every single image edit at least in
case only one fast opencl device is available. There could be a
configuration parameter to manage this behaviour. In case of only one not
very fast opencl device or two fast opencl devices it still may be a good
idea to let these two pixelpipes run in parallel as they do now. I think
there cannot be one optimal setting for everyone, it depends on particular
system configuration.
Suni
2013/12/21 johannes hanika <hana...@gmail.com>
>
>
>
> On Sun, Dec 22, 2013 at 1:52 AM, suni <s...@seznam.cz> wrote:
>
>> Thank you Tobias, I was not aware of that. But anyway it sounds a bit
>> strange to me. Why should any module depend on preview window which carries
>> a lot less image information than the main image? I can imagine that it may
>> be some remain from past when opencl was not implemented and cpu code was
>> not so optimized as it is now. In such situation calculating the histogram
>> from preview may be huge speed benefit. But I am not sure if such strategy
>> is still valid even nowadays.
>>
>
> absolutely still valid. if you have a full hd monitor and a 25MP image,
> you leave > 20x performance lying on the table. and we have some modules
> which are still only borderline acceptable in response time, even if you
> just process one megapixel instead of the full image. to get a feeling for
> it, just export a full res picture, that will not run any preview pipe,
> only one full-size pipe. depending on your history stack that might take
> around 30 sec..
>
> j.
>
>
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