Problem with Batch Queue multi core processing

[Robert Zeller]

Thanks for the information, Maik! So I am waiting for DK 5.8

Robert


On 23.09.2017 23:25, Maik Qualmann wrote:
> This problem is fixed in digiKam-5.8.0. The thread support for libraw was not 
> activated, it only affects NEF files.
>
> See here:
>
> http://digikam.1695700.n4.nabble.com/Batch-RAW-Conversion-to-jpg-leads-to-unusable-jpg-tiff-when-using-all-kernels-td4703791.html
>
> Maik
>
> Am Samstag, 23. September 2017, 22:44:21 CEST schrieb Robert Zeller:
>> Gilles,
>>
>> My system has a 6 core CPU with 16 GB of main memory; OS is openSUSE
>> Leap 42.3, I am running DK 5.7.0-178.7 as provided by SUSE distribution.
>>
>> I am encountering a problem with multi core processing in BQM when
>> converting NIKON raw files and using all 6 cores; BQM is using the
>> following workflow:
>>
>> Color Auto-correction
>>
>> Sharpen Image
>>
>> Color Effects
>>
>> Convert to JPEG
>>
>> This works fine with just ONE image in the run-Queue and "Work on all
>> processor cores" enabled. With more than one image in the queue I only
>> get a pattern of fine lines in RGB colors in the resulting jpegs .
>> Disabling "Work on all processor cores" I get correct results for all
>> pictures, but clearly at the prize of loosing all the possible speedup
>> of the 6 cores.
>>
>> With all cores enabled I can see that every core is allocating its one
>> memory, and there is definitely enough memory on my system.
>>
>> Could it be, that for some reason the memory gets mixed up among the six
>> running jobs? Or am I doing something  wrong?
>>
>> Best regards,
>>
>> Robert Zeller

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