https://bugs.kde.org/show_bug.cgi?id=426086
--- Comment #6 from k...@binkmail.com --- (In reply to caulier.gilles from comment #5) > Did you have the metadata view open in right sidebar, and especially the > ExifTool tab ? Nope. Usually filters and I just checked and exiftool isn't running. I have a folder with a single big tiff in it. I right click the folder and select refresh then click on another folder and back on this one. The thumbnail for the tiff is a grey box. The process monitor at the bottom of the screen says "Thumbs" and 0%. 3-4 minutes and many billions of cpu cycles later the Thumbs process ends and I see the tiff thumbnail. While 'Thumbs' is running I looked at the Digikam process and there is one or more threads each of which is using 4.1% of a 12 core 24 thread 4.1GHz Ryzen CPU. The call stacks look like ntoskrnl.exe!KeSynchronizeExecution+0x5b66 ntoskrnl.exe!KeWaitForSingleObject+0x1460 ntoskrnl.exe!KeWaitForSingleObject+0x98f ntoskrnl.exe!KeWaitForSingleObject+0x233 ntoskrnl.exe!ExWaitForRundownProtectionRelease+0x7dd ntoskrnl.exe!KeWaitForSingleObject+0x3a29 ntoskrnl.exe!KeSynchronizeExecution+0x3140 msvcrt.dll!putc libtiff-5.dll!TIFFmemcmp+0x1fc8 libtiff-5.dll!TIFFmemcmp+0x39fa libtiff-5.dll!TIFFmemcmp+0x10df libtiff-5.dll!TIFFPredictorCleanup+0x9d libtiff-5.dll!TIFFPrintDirectory+0x585 DImg_TIFF_Plugin.dll!ZN21DigikamTIFFDImgPlugin14DImgTIFFLoader4loadERK7QStringPN7Digikam18DImgLoaderObserverE+0x709 libdigikamcore.dll!ZN7Digikam4DImg4loadERK7QStringiPNS_18DImgLoaderObserverERKNS_12DRawDecodingE+0xa1f libdigikamcore.dll!ZNK7Digikam16ThumbnailCreator18loadWithDImgScaledERK7QStringPNS_10IccProfileE+0xd3 libdigikamcore.dll!ZNK7Digikam16ThumbnailCreator15createThumbnailERKNS_13ThumbnailInfoERK5QRect+0x1146 libdigikamcore.dll!ZNK7Digikam16ThumbnailCreator4loadERKNS_19ThumbnailIdentifierERK5QRectb+0x105 libdigikamcore.dll!ZNK7Digikam16ThumbnailCreator4loadERKNS_19ThumbnailIdentifierE+0x2d libdigikamcore.dll!ZN7Digikam20ThumbnailLoadingTask7executeEv+0x57a libdigikamcore.dll!ZN7Digikam14LoadSaveThread3runEv+0x16a libdigikamcore.dll!ZN7Digikam13DynamicThread7Private3runEv+0x30 Qt5Core.dll!ZN11QThreadPool6cancelEP9QRunnable+0x9a Qt5Core.dll!ZN7QThread21setTerminationEnabledEb+0x103 KERNEL32.DLL!BaseThreadInitThunk+0x14 ntdll.dll!RtlUserThreadStart+0x21 I notice that just clicking refresh starts one 4% CPU thread. Switching view to another folder and back triggers another 1 or 2 4% threads, looks like it is simultaneously trying to generate the same thumbnail. Thumbnail generation is not *the* problem. After thumbnails are generated if I click on the thumbnail show full screen button I get 1 4% thread like ntoskrnl.exe!KeSynchronizeExecution+0x5b66 ntoskrnl.exe!KeWaitForSingleObject+0x1460 ntoskrnl.exe!KeWaitForSingleObject+0x98f ntoskrnl.exe!KeWaitForSingleObject+0x233 ntoskrnl.exe!ExWaitForRundownProtectionRelease+0x7dd ntoskrnl.exe!KeWaitForSingleObject+0x3a29 ntoskrnl.exe!KeSynchronizeExecution+0x3140 libtiff-5.dll!wcsrtombs+0x11e libtiff-5.dll!wcsrtombs+0x13e libtiff-5.dll!TIFFmemcmp+0x10c7 libtiff-5.dll!TIFFPredictorCleanup+0x9d libtiff-5.dll!TIFFPrintDirectory+0x585 DImg_TIFF_Plugin.dll!ZN21DigikamTIFFDImgPlugin14DImgTIFFLoader4loadERK7QStringPN7Digikam18DImgLoaderObserverE+0x709 libdigikamcore.dll!ZN7Digikam4DImg4loadERK7QStringiPNS_18DImgLoaderObserverERKNS_12DRawDecodingE+0xa1f libdigikamcore.dll!ZN7Digikam4DImg4loadERK7QStringPNS_18DImgLoaderObserverERKNS_12DRawDecodingE+0x17 libdigikamcore.dll!ZN7Digikam18PreviewLoadingTask7executeEv+0x777 libdigikamcore.dll!ZN7Digikam14LoadSaveThread3runEv+0x16a libdigikamcore.dll!ZN7Digikam13DynamicThread7Private3runEv+0x30 Qt5Core.dll!ZN11QThreadPool6cancelEP9QRunnable+0x9a Qt5Core.dll!ZN7QThread21setTerminationEnabledEb+0x103 KERNEL32.DLL!BaseThreadInitThunk+0x14 ntdll.dll!RtlUserThreadStart+0x21 and see nothing on the screen for 3-4 minutes. I don't know if it is reading the tiff file backwards like the initial report, all the files are on SSD now all being read from the system cache. As I said windows paint manages to load a 500MB tiff in about 3 seconds. -- You are receiving this mail because: You are watching all bug changes.
