[rt-users] Slow Ticket History 3.8.8

[Charles Johnson]

Justin, thank you for the kindness of your reply. I didn't intend to  
send you chasing rabbits, so to speak. Just offering something to add  
to the checklist of items to be crossed off before digging too deeply  
into the perl code. If you are convinced that mysql is performing at  
its best then please ignore my noise! :)

Cheers--

Charles
On Jun 29, 2010, at 9:18 AM, Justin Hayes wrote:

> Hi Charles,
>
> But as far as we can tell from our profiling the time is spent in  
> the perl rendering the ticket, not in the query used to retrieve the  
> ticket and attachments in the first place (which happens once at the  
> start I believe). The loop that renders the ticket history and each  
> attachment takes anything up to 20+ seconds.
>
> So I'm not sure how the DB can be an issue here? Unless I'm wrong  
> about it doing 1 big query at the start and there are loads of  
> little queries inside the loop.
>
> Cheers,
>
> Justin
>
> -------------------------------------------------
> Justin Hayes
> OpenBet Support Manager
> justin.hayes at openbet.com
>
> On 29 Jun 2010, at 15:14, Charles Johnson wrote:
>
>> Quite outside of the speed of RT, what database are you using as a  
>> back-end? How long has it been since you did some care and feeding  
>> of your database? How big are your tables? If you are using mysql  
>> or postgres have you used their tools to examine your database,  
>> especially the indexes and statistics? This may be an issue with  
>> indexes needing to be rebuilt, or asking the database to gather new  
>> statistics for the queries your are running.
>>
>> Cheers--
>>
>> Charles
>>
>> On Jun 29, 2010, at 8:09 AM, Justin Hayes wrote:
>>
>>> Hi everyone,
>>>
>>> I've raised this before, but we've had another look at it and  
>>> still can't see how to improve things.
>>>
>>> We put a lot of comments/replies in our tickets. Often there can  
>>> be 50-100 entries in a ticket, mostly plain text. Loading such a  
>>> ticket can take 10-20secs.
>>>
>>> We don't have any slow queries - all the time seems to be in the  
>>> code rendering the history of the ticket.
>>> We've had a go at stripping functions out of ShowHistory,  
>>> ShowTransaction and ShowTransactionAttachmments but not had much  
>>> success.
>>>
>>> FWIW our RT runs on quad 3ghz Xeons with 8gb of ram.
>>>
>>> I'd like to try and determine if we're just slow, or if this is  
>>> just how long RT takes. Maybe perl is just slow.
>>>
>>> Can anyone shed any light on how long it takes them to render long  
>>> tickets in their systems? If you look at the page source it gives  
>>> you a value e.g.
>>>
>>> <span>Time to display: 24.996907</span>
>>>
>>> Can anyone share some numbers from theirs for longer tickets? It  
>>> would be really appreciated.
>>>
>>>
>>> Thanks,
>>>
>>> Justin
>>>
>>> -------------------------------------------------
>>> Justin Hayes
>>> OpenBet Support Manager
>>> justin.hayes at openbet.com
>>>
>>>
>>> Discover RT's hidden secrets with RT Essentials from O'Reilly Media.
>>> Buy a copy at http://rtbook.bestpractical.com
>>
>> --
>> Charles Johnson, Vanderbilt University
>> Advanced Computing Center for Research & Education
>> Mailing Address:  Peabody #34, 230 Appleton Place, Nashville, TN  
>> 37203
>> Shipping Address: 1231 18th Avenue South, Hill Center, Suite 143,  
>> Nashville, TN 37212
>> Office: 615-343-4134
>> Cell: 615-478-5743
>> Fax: 615-343-7216
>> charles.johnson at accre.vanderbilt.edu
>>
>

--
Charles Johnson, Vanderbilt University
Advanced Computing Center for Research & Education
Mailing Address:  Peabody #34, 230 Appleton Place, Nashville, TN 37203
Shipping Address: 1231 18th Avenue South, Hill Center, Suite 143,  
Nashville, TN 37212
Office: 615-343-4134
Cell: 615-478-5743
Fax: 615-343-7216