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

[sean darcy]

Great. I'll try that.

Thanks for the help.

sean

Gilles Caulier wrote:
> 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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