[jira] Closed: (IMAP-13) STATUS command performance

["Robert Burrell Donkin (JIRA)" <se...@james.apache.org>]

     [ https://issues.apache.org/jira/browse/IMAP-13?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Burrell Donkin closed IMAP-13.
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.1
         Assignee: Robert Burrell Donkin  (was: Joachim Draeger)

Status performance now seems reasonable. Expect more improvements once mailbox API is restructured.

> STATUS command performance
> --------------------------
>
>                 Key: IMAP-13
>                 URL: https://issues.apache.org/jira/browse/IMAP-13
>             Project: JAMES Imap
>          Issue Type: Improvement
>         Environment: evolution email client 
>            Reporter: Robert Burrell Donkin
>            Assignee: Robert Burrell Donkin
>             Fix For: 0.1
>
>         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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