https://bugs.kde.org/show_bug.cgi?id=431945
Bug ID: 431945
Summary: Comics Manager memory leak in Krita 4.4.2
Product: krita
Version: 4.4.2
Platform: Appimage
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: papazoglou.anes...@gmail.com
Target Milestone: ---
SUMMARY
Generating the thumbnail for Comics Manager takes a long time and consumes a
large amount of memory that is not released.
STEPS TO REPRODUCE
1. Create a comic project in Comics Manager.
2. Add pages into it.
3. Open the project again in Krita.
OBSERVED RESULT
Comics Manager takes a long time to generate the thumbnails and consumes a
large amount of memory (proportional to the size and number of pages in the
project).
EXPECTED RESULT
Loading the thumbnails is near instantaneous and consumes imperceptible amount
of memory.
SOFTWARE/OS VERSIONS
Ubuntu: 20.04
Tested both the appimage and flatpak versions.
ADDITIONAL INFORMATION
When loading an existing comicConfig.json comic (e.g. 56 pages, 4962x7014
pixels), Krita displays a “Loading pages” dialogue for ~10 seconds before it
loads the thumbnails. When that is done, Krita uses 7.5GB more RAM than before
opening the json file and it doesn’t seem to be released. Opening any of the
pages uses additional memory still.
Adding a new page also keeps increasing the memory usage.
This happens both with the appimage and flatpak for 4.4.2. When using the 4.4.1
appimage, opening comicConfig.json happens instantly and it takes a negligible
amount of memory.
Also quoting some additional information from Tiar on krita-artists
(https://krita-artists.org/t/potential-memory-leak-for-comics-manager-in-krita-4-4-2/17391):
I believe it might be because Krita loads those files as KisDocuments (which
means it loads it fully) and then it doesn’t release it even though it removes
those documents because Krita doesn’t release memory unless it’s needed
(technicalities of using TileManager).
Suspicious lines:
/comics_project_management_tools/comics_project_manager_docker.py:913:
/comics_project_management_tools/comics_project_manager_docker.py:720:
I think in other places Krita just loaded mergedimage.png, I think it would be
better if it used it everywhere for thumbnails unless it’s for actual loading
the file when the user clicks on it.
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