[Bug 300572] New: marking emails as read causes GBs of disk i/o

[S. Burmeister]

https://bugs.kde.org/show_bug.cgi?id=300572

            Bug ID: 300572
          Severity: normal
           Version: unspecified
          Priority: NOR
                CC: vkrause at kde.org
          Assignee: kdepim-bugs at kde.org
           Summary: marking emails as read causes GBs of disk i/o
    Classification: Unclassified
                OS: Linux
          Reporter: sven.burmeister at gmx.net
          Hardware: Other
            Status: UNCONFIRMED
         Component: Nepomuk Feeder Agents
           Product: Akonadi

4.8.3

MArking ~2000 emails (plain text only, a few MB total size) as read causes the
akonadi_nepomuk_feeder to write ~5GB data to the hard disk.

Reproducible: Always

Steps to Reproduce:
1. HAve a local folder with a few thousand unread emails, e.g. a mailinglist
folder, i.e. small text emails.
2. RMB > mark all emails as read from within kmail
3. use iotop to watch the disk i/o
Actual Results:  
GBs of data are written to the disk just to mark emails worth a few MB as read.

Efficiency is something different. Apart from that it blocks the disk and hence
the computer.

Expected Results:  
Get the "mark as read" done within seconds at most.

If one watches the process list at the beginning of the "mark as read" action
one can see that there are other processes using far too much resources for
something as simple as marking messages as read and changing their status in
some DB.

kmail uses 20%
mysqld 20%
akonadi_agent_launcher 20%
as well as the mentioned akonadi_nepomuk_feeder, and akonadi_mailfilter_agent

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