STATUS command performance
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Key: JAMES-720
URL: http://issues.apache.org/jira/browse/JAMES-720
Project: James
Issue Type: Improvement
Components: IMAPServer
Affects Versions: Trunk
Environment: evolution email client
Reporter: Robert Burrell Donkin
I've been running my server for a little while with extra performance logging
to try to work out why it's sluggish.
The command parsing is orders of magnitudes faster than the data access.
The reasons seems to be the performance of the STATUS command. Since STATUS is
typically called every couple of minutes for every mail box visible on screen,
it's quite a significant issue for this email client. (some other clients use
SEARCH instead but this is no currently supported.)
This performance seems to worsen quickly as the number of messages in the box
increases.
On my box:
STATUS on an empty mailbox with three empty sub mailboxes takes ~45 ms
STATUS on a mailbox with ~10 read messages takes ~100ms
STATUS on a mailbox with ~ 50 messages with 40 unread takes ~450ms
STATUS on a mailbox with ~ 150 with 40 unread takes ~1800ms
STATUS on a mailbox with ~ 570 unread messages takes ~6600ms
Any clues about where to start looking?
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