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List:       kde-bugs-dist
Subject:    [Akonadi] [Bug 364114] moving a folder within one maildir resource is extremely slow and inefficient
From:       Martin Steigerwald via KDE Bugzilla <bugzilla_noreply () kde ! org>
Date:       2016-06-23 10:56:16
Message-ID: bug-364114-17878-tEv2MzucEu () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=364114

--- Comment #1 from Martin Steigerwald <Martin@Lichtvoll.de> ---
Today I tried to be clever:

- I just stopped Akonadi and waited till it was gone (including mysqld
process).
- Then I manually moved several large folders with LKML mails, one with 260000+
mails within the maildir to another directory within the very same local
folders resource, a directory/folder I use for archival purpose

But again, KMail is unresponsive when I ask it to display the contents of a
mail. It can display the list of mails that a folder contains, but displaying a
mail content does not work. While it is busy in the background with about
50-120% cpu usage for the mysqld process and about 120-140 MiB – in words more
than hundred MiB – of writes to the dual SSD BTRFS RAID 1 every 10 seconds.

So for a simple action of moving a folder it creates write I/Os in excess of
several GiB *easily*. Sorry, but this is just broke in my eyes.

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