[Akonadi] [Bug 458980] New: Large mbox eats the whole memory

[Tusooa Zhu]

https://bugs.kde.org/show_bug.cgi?id=458980

            Bug ID: 458980
           Summary: Large mbox eats the whole memory
           Product: Akonadi
           Version: unspecified
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: MBox Resource
          Assignee: kdepim-bugs at kde.org
          Reporter: tusooa at kazv.moe
  Target Milestone: ---

SUMMARY
***
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A large (351M) mbox will make akonadi eats all system memory.

STEPS TO REPRODUCE
1. Get a large mbox file. (I got it from gmail export)
2. Add it as a receiving account in KMail. (Configure -> Accounts -> Receiving
-> Add... -> Custom account -> mbox)
3. Reboot

OBSERVED RESULT
Memory usage is very high, using almost all memory (I have 16 GB), system
becomes very laggy. After `akonadictl stop`, the memory usage goes down
immediately.

EXPECTED RESULT
It should not use up a lot of memory. For a comparison, mutt uses only 39M of
memory opening the mbox.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma:  5.18.12-gentoo-x86_64
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5

ADDITIONAL INFORMATION

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