Problem with Batch Queue multi core processing

[Gilles Caulier]

You can test the pre release bundle available here :

https://drive.google.com/drive/folders/0BzeiVr-byqt5Y0tIRWVWelRJenM



2017-09-23 23:30 GMT+02:00 Robert Zeller <robert.zeller at robert-zeller.org>:

> 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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