[digikam] [Bug 372435] Use multiple cpu cores for duplicate search

[Alister Troup]

https://bugs.kde.org/show_bug.cgi?id=372435

Alister Troup <alister at i-am-zeus.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alister at i-am-zeus.com

--- Comment #7 from Alister Troup <alister at i-am-zeus.com> ---
This appears still to be an issue - at least on the windows version 5.6.0 x64

I'm running on a xeon 1231 v3 (4 cores plus HT) 16GB RAM, using MarinaDB server
on local Host, SSD as OS/DatabaseData

Currently doing a "Find Duplicates" on a large collection 

Digikam.exe

Threads 254 
CPU 12 
Average CPU 12.42

Process Explorer 
msvcrt.dll!ftime64_s+0x180 thread is ~12.5 CPU

Stack capture

ntoskrnl.exe!memset+0x61a
ntoskrnl.exe!KeWaitForMultipleObjects+0xd52
ntoskrnl.exe!KeWaitForSingleObject+0x19f
ntoskrnl.exe!PoStartNextPowerIrp+0xbd0
ntoskrnl.exe!PoStartNextPowerIrp+0x186d
ntoskrnl.exe!PoStartNextPowerIrp+0x1ae7
libdigikamdatabase.dll!ZN7Digikam9HaarIface14calculateScoreERNS_4Haar13SignatureDataES3_RNS1_7WeightsEPPNS1_12SignatureMapE+0xd4
libdigikamdatabase.dll!ZN7Digikam9HaarIface14searchDatabaseEPNS_4Haar13SignatureDataENS0_10SketchTypeER5QListIiENS0_28DuplicatesSearchRestrictionsExi+0xb12
libdigikamdatabase.dll!ZN7Digikam9HaarIface24bestMatchesWithThresholdExPNS_4Haar13SignatureDataEddR5QListIiENS0_28DuplicatesSearchRestrictionsENS0_10SketchTypeE+0xd2
libdigikamdatabase.dll!ZN7Digikam9HaarIface32bestMatchesForImageWithThresholdExddR5QListIiENS0_28DuplicatesSearchRestrictionsENS0_10SketchTypeE+0x158
libdigikamdatabase.dll!ZN7Digikam9HaarIface14findDuplicatesERK4QSetIxEddNS0_28DuplicatesSearchRestrictionsEPNS_20HaarProgressObserverE+0x273
libdigikamdatabase.dll!ZN7Digikam9HaarIface29findDuplicatesInAlbumsAndTagsERK5QListIiES4_NS0_16AlbumTagRelationEddNS0_28DuplicatesSearchRestrictionsEPNS_20HaarProgressObserverE+0x351
libdigikamdatabase.dll!ZN7Digikam9HaarIface23rebuildDuplicatesAlbumsERK5QListIiES4_NS0_16AlbumTagRelationEddNS0_28DuplicatesSearchRestrictionsEPNS_20HaarProgressObserverE+0x67
libdigikamdatabase.dll!ZN7Digikam11SearchesJob3runEv+0x8f2
Qt5Core.dll!ZN11QThreadPool5clearEv+0xe5
Qt5Core.dll!ZN7QThread21setTerminationEnabledEb+0x14c
msvcrt.dll!srand+0x93
msvcrt.dll!ftime64_s+0x1dd
kernel32.dll!BaseThreadInitThunk+0xd
ntdll.dll!RtlUserThreadStart+0x21


Memory is 696 MB private Bytes

I/O is 380B average peaks to 26KB

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