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From "Robert Burrell Donkin (JIRA)" <server-...@james.apache.org>
Subject [jira] Created: (JAMES-720) STATUS command performance
Date Sat, 02 Dec 2006 14:07:22 GMT
STATUS command performance

                 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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