[Bug 264278] New: KMail uses too much CPU time reacting to Akonadi synchronising IMAP folders
Thiago Macieira
thiago at kde.org
Tue Jan 25 17:40:33 GMT 2011
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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