[Bug 264278] New: KMail uses too much CPU time reacting to Akonadi synchronising IMAP folders

[Thiago Macieira]

https://bugs.kde.org/show_bug.cgi?id=264278

           Summary: KMail uses too much CPU time reacting to Akonadi
                    synchronising IMAP folders
           Product: kmail2
           Version: 2.0.89
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: thiago at kde.org


Version:           2.0.89 (using Devel) 
OS:                Linux

When Akonadi is synchronising its IMAP folders, KMail / Kontact's CPU usage
goes to 100% and it becomes sluggish. It doesn't reach unresponsiveness state,
but it's slow enough reacting to user interaction that it's unusable.

This is being run on a Quad-Core Core-i7 @ 2.67 GHz, 2 threads per core. It's
not a limit of the system, since most other CPUs are idling -- just one is at
100% usage, by the kmail / kontact process.

Depending on the number of folders and the connection speed, the period under
which KMail is unusable can be quite long. And if the connection speed is high,
the level of usability decreases (that is, KMail is doing more work and
reacting less to user interaction).

In my case, I had one IMAP server with 50+ folders at a 5-minute check
interval. That means KMail would be completely unusable about 1 every 5
minutes.

Reproducible: Always




OS: Linux (i686) release 2.6.36.2-server-1mnb
Compiler: gcc

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