[Digikam-users] Batch converter: can it use more than 1 cpu?

[Gilles Caulier]

Yes i know this problem, and it's already fixed in libkdcraw from trunk.

Gilles Caulier

2009/12/27 sean darcy <seandarcy2 at gmail.com>:
> Gilles Caulier wrote:
>> Batch Queue Manager already use multithreading, but not on multi core
>> computer...
>>
>> But...
>>
>> about RAW conversion, libraw included in libkdcraw support
>> parallelized demosaicing. You need to install OpenMp library and
>> recompile libkdcraw.
>>
>> Check in digiKam Help/Components Info to see if parallelized
>> demosaicing is supported.
>>
>> Gilles Caulier
>>
>> 2009/12/27 sean darcy <seandarcy2 at gmail.com>:
>>> On svn 1.1, I'm using the Raw Image batch converter on 35 images, on a
>>> quad-core. top shows only 1 cpu being used.
>>>
>>> Is there a setting someplace that would enable threading? Or, if not
>>> technically threading, where the converter converts as many images at
>>> once as no_cpus?
>>>
>>> sean
>>>
>
> Well, I do have libgomp - OpenMP installed, and kdegraphics finds it:
>
> CMake version (cleaned): cmake version 2.6.4
> -- Try OpenMP C flag = [-fopenmp]
> -- Performing Test OpenMP_FLAG_DETECTED
> -- Performing Test OpenMP_FLAG_DETECTED - Success
> -- Try OpenMP CXX flag = [-fopenmp]
> -- Performing Test OpenMP_FLAG_DETECTED
> -- Performing Test OpenMP_FLAG_DETECTED - Success
> -- Found OpenMP: -fopenmp
> -- OpenMP detected: LibRaw will be compiled with parallelized code.
>
> But it looks like libRaw is NOT built with -fgomp:
>
> [  7%] Building CXX object
> libs/libkdcraw/test/CMakeFiles/mem_image.dir/__/libraw/src/libraw_cxx.o
> cd
> /home/photo/rpmbuild/BUILD/kdegraphics-4.3.3/x86_64-redhat-linux-gnu/libs/libkdcraw/test
> && /usr/lib64/ccache/c++   -D_BSD_SOURCE -D_XOPEN_SOURCE=500
> -D_BSD_SOURCE -DQT_NO_STL -DQT_NO_CAST_TO_ASCII -D_REENTRANT
> -DKDE_DEPRECATED_WARNINGS -DUSE_LCMS -DDCRAW_VERBOSE -O3 -march=native
> -mtune=native -msse4.1 -ftree-vectorize -floop-interchange
> -floop-strip-mine -floop-block -mfpmath=sse  -Wnon-virtual-dtor
> -Wno-long-long -ansi -Wundef -Wcast-align -Wchar-subscripts -Wall -W
> -Wpointer-arith -Wformat-security -fno-exceptions -fno-check-new
> -fno-common -Woverloaded-virtual -fno-threadsafe-statics
> -fvisibility=hidden -fvisibility-inlines-hidden -O2 -DNDEBUG
> -DQT_NO_DEBUG
> -I/home/photo/rpmbuild/BUILD/kdegraphics-4.3.3/x86_64-redhat-linux-gnu/libs/libkdcraw/test
> -I/home/photo/rpmbuild/BUILD/kdegraphics-4.3.3/libs/libkdcraw/test
> -I/home/photo/rpmbuild/BUILD/kdegraphics-4.3.3
> -I/home/photo/rpmbuild/BUILD/kdegraphics-4.3.3/x86_64-redhat-linux-gnu
> -I/home/photo/rpmbuild/BUILD/kdegraphics-4.3.3/libs/libkdcraw/libraw
> -I/home/photo/rpmbuild/BUILD/kdegraphics-4.3.3/libs/libkdcraw/test/../libkdcraw
> -I/usr/include/kde4 -I/usr/include/kde4/KDE -I/usr/include/KDE
> -I/usr/include/QtXmlPatterns -I/usr/include/QtWebKit
> -I/usr/include/QtHelp -I/usr/include/QtAssistant -I/usr/include/QtDBus
> -I/usr/include/QtTest -I/usr/include/QtUiTools -I/usr/include/QtScript
> -I/usr/include/QtSvg -I/usr/include/QtXml -I/usr/include/QtSql
> -I/usr/include/QtOpenGL -I/usr/include/QtNetwork
> -I/usr/include/QtDesigner -I/usr/include/Qt3Support -I/usr/include/QtGui
> -I/usr/include/QtCore -I/usr/include/Qt -I/usr/lib64/qt4/mkspecs/default
>   -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -fexceptions -DLIBRAW_BUILDLIB -w
> -o CMakeFiles/mem_image.dir/__/libraw/src/libraw_cxx.o -c
> /home/photo/rpmbuild/BUILD/kdegraphics-4.3.3/libs/libkdcraw/libraw/src/libraw_cxx.cpp
>
> even though:
>
> x86_64-redhat-linux-gnu/CMakeFiles/CMakeOutput.log:/usr/lib64/ccache/c++
>    -O3 -march=native -mtune=native -msse4.1 -ftree-vectorize
> -floop-interchange -floop-strip-mine -floop-block -mfpmath=sse
> -Wnon-virtual-dtor -Wno-long-long -ansi -Wundef -Wcast-align
> -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security
> -fno-exceptions -fno-check-new -fno-common -Woverloaded-virtual
> -fno-threadsafe-statics -fvisibility=hidden -fvisibility-inlines-hidden
>  -DOpenMP_FLAG_DETECTED -fopenmp  -fPIC
> CMakeFiles/cmTryCompileExec.dir/src.cxx.o  -o cmTryCompileExec -rdynamic
>
> sean
>
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