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From "Robert Burrell Donkin (JIRA)" <server-...@james.apache.org>
Subject [jira] Commented: (JAMES-720) STATUS command performance
Date Sun, 03 Dec 2006 21:13:22 GMT
    [ http://issues.apache.org/jira/browse/JAMES-720?page=comments#action_12455212 ] 
            
Robert Burrell Donkin commented on JAMES-720:
---------------------------------------------

I wonder whether caching UIDs against message IDs is actually worthwhile unless the caching
data access can be optimised. 

> 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
>         Attachments: STATUS-perf.patch
>
>
> 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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