[Bug 276620] New: Mark EMail Actions spikes Virtuoso CPU usage

[Andre Heinecke]

https://bugs.kde.org/show_bug.cgi?id=276620

           Summary: Mark EMail Actions spikes Virtuoso CPU usage
           Product: Akonadi
           Version: 4.6
          Platform: MS Windows
        OS/Version: MS Windows
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: Nepomuk Feeder Agents
        AssignedTo: tokoe at kde.org
        ReportedBy: aheinecke at intevation.de
                CC: vkrause at kde.org, kdepim-bugs at kde.org


Created an attachment (id=61371)
 --> (http://bugs.kde.org/attachment.cgi?id=61371)
CPU Usage after mark as read

Version:           4.6 (using KDE 4.6.4) 
OS:                MS Windows

When you select several emails and do a action like "Mark Mails as Read / Mark
Mails as Unread" etc. you get an extreme spike in CPU usage of Virtuoso while
akonadi_nepomuk_email_feeder produces loads of debug output.
Test was with 500 Mails and took ~60 secons high 
During this time my hard disk was also working on its limit.

Attached is a screenshot of the cpu usage (grid x axis is 5 seconds) and the
unshortened debug output created during this action.

Reproducible: Always

Steps to Reproduce:
1. Select ~500 Mails
2. Mark Mail as read / unread


Actual Results:  
CPU usage and Disk IO Spikes. For 60-100 seconds in my tests, i guess this will
depend on your machine.

Expected Results:  
Marking some hundred mails with a tag/flag should not take several minutes.

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