[rt-users] Slow Ticket History 3.8.8

Kenneth Marshall ktm at rice.edu
Thu Sep 9 08:50:20 EDT 2010 

One big win with enabling compression was that pages loaded in bigger
pieces and you have less problems with users trying to type in an
page that is unfinished with unpredictable results. With the DEFLATE
on, the page all decompresses on the fast client instead of dribbling
out from the server.

Cheers,
Ken

On Thu, Sep 09, 2010 at 08:13:28AM +0100, Justin Hayes wrote:
> Aren't those options just compressing the page to send out to the browser and caching the output?
> 
> We're on an internal gigabit network so seems unlikely that would help. All our time goes on the server actually building the page to send out I think.
> 
> Can try it though :)
> 
> Justin
> 
> -------------------------------------------------
> Justin Hayes
> OpenBet Support Manager
> justin.hayes at openbet.com
> 
> On 7 Sep 2010, at 12:45, Torsten Brumm wrote:
> 
> > Hi Justin,
> > just created inside a RT Test VM (slow one with 500mb ram) a single ticket with around 60 replies and some comments. Tested the speed with different users
> > 
> > 1. root user to open this ticket: around 26 sec -> 870 single sql queries in around 4 sec! (Queries: http://pastebin.com/7Yekfx2Y)
> > 2. user with full access (take, own, modify etc): around same time and queries like root (Queries: http://pastebin.com/U0HnPcJL)
> > 3. user with less rights (no take, no own, only showticket, seequeue): time around 15 sec and 600 sql queries in around 2 sec! (Queries: http://pastebin.com/fXDHu6im)
> > 
> > After this the apache starts to render the page from the results and push them to the browser. The page is for my few comments/replies already 206KB without any apache optimizations
> > 
> > After adding: 
> > 
> >         SetOutputFilter DEFLATE
> >         SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$  no-gzip dont-vary
> >         SetEnvIfNoCase Request_URI \.pdf$ no-gzip dont-vary
> >         ExpiresActive On
> >         ExpiresByType text/css "A604800"
> > 
> >         ExpiresByType image/x-icon "A31536000"
> >         ExpiresByType image/gif "A604800"
> >         ExpiresByType image/jpg "A604800"
> >         ExpiresByType image/jpeg "A604800"
> > 
> >         ExpiresByType image/png "A604800"
> >         ExpiresByType application/x-javascript A3600
> >         Header set Cache-Control "must-revalidate"
> > to the rt vhost, the page load time goes down from 26 sec to 8 sec and from 206 kb to 10kb
> > 
> > you should try.
> > 
> > Torsten
> > 
> > 2010/9/7 Justin Hayes <justin.hayes at openbet.com>
> > Well we've captured the time for all the queries run for our long ticket (which takes ~20secs to generate).
> > 
> > Total query time is 0.871493s
> > 
> > So it's not the DB.
> > 
> > Justin
> > 
> > -------------------------------------------------
> > Justin Hayes
> > OpenBet Support Manager
> > justin.hayes at openbet.com
> > 
> > On 7 Sep 2010, at 11:13, Torsten Brumm wrote:
> > 
> >> Hi Justin,
> >> just found this threat, sounds interessting.
> >> 
> >> What i read so far: You have 1 quad core system with 8GB RAM, running both WEB and DB, correct?
> >> 
> >> Think you should follow Raed's hints first to log the queries generated with RT
> >> 
> >>> In terms of debug; if you have not done this yet enable DBIx-SearchBuilder StatementLog
> >>> Set($StatementLog,?debug?);  in your etc/RT_SiteConfig.
> >> I'm sure you will find some funny queries. Normally the Query Log of default MySQL can only log queries taking longer than a second, but in your case i think, you will have several much faster queries but in summary they take longer - but you can't find in mysql-slow log.
> >> 
> >> Some more question regarding your hardware and setup.
> >> 
> >> 1. One Server / quad core (hyper threating) -> how many threats for Mysql/Postgresql? / 8 GB Ram 
> >> 2. Hard Disk Setup? (logfiles and db storred on different HDD's? Any I/O Problems?)
> >> 3. RT Rights Setup, does the user performance is faster or slower than the performance with root user?
> >> 
> >> Some more information?
> >> 
> >> We're running also a larger RT Instance with dedicated hardware for DB and Webservers with no huge perferomance bottlenacks.
> >> 
> >> Tob
> >> 
> >> 2010/9/7 Justin Hayes <justin.hayes at openbet.com>
> >> I *think* we're just CPU bound. Roy's webservers are 3.6ghz so quite a bit faster than ours. We're going to try it on a faster server and that should drop our times. Guess we just wanted to explore all avenues before throwing hardware at the problem.
> >> 
> >> Justin
> >> 
> >> -------------------------------------------------
> >> Justin Hayes
> >> OpenBet Support Manager
> >> justin.hayes at openbet.com
> >> 
> >> On 7 Sep 2010, at 10:30, Justin Hayes wrote:
> >> 
> >>> Tried Centos last night, and no difference at all.
> >>> 
> >>> -------------------------------------------------
> >>> Justin Hayes
> >>> OpenBet Support Manager
> >>> justin.hayes at openbet.com
> >>> 
> >>> On 6 Sep 2010, at 20:49, Justin Hayes wrote:
> >>> 
> >>>> Hi Ruslan,
> >>>> 
> >>>> Sorry looks like I shrunk the image too much. The thing I find odd is that there are others with similar hardware who don't get the problem. It'll be great if 3.10 fixes it for me, but I'd love to get to the bottom of it first. I'm pretty much positive it's not a DB issue, as I've tried different sizes of DB, tried postgres AND mysql etc. I don't think it's apache as I've tried the built in webserver with RT and no change there either.
> >>>> 
> >>>> Currently trying to install RT on Centos given that Roy (who has kindly been helping me with details of his own setup) appears to have none of the same problems on that OS. Perhaps perl is just slow on the 64bit ubuntu we've currently got live.
> >>>> 
> >>>> No idea if it's going to have any effect though :(
> >>>> 
> >>>> Justin
> >>>> 
> >>>> -------------------------------------------------
> >>>> Justin Hayes
> >>>> OpenBet Support Manager
> >>>> justin.hayes at openbet.com
> >>>> 
> >>>> On 6 Sep 2010, at 18:37, Ruslan Zakirov wrote:
> >>>> 
> >>>>> Justin.
> >>>>> 
> >>>>> First of all, I can not read from the chart, but anyway history rendering has been worked on in a new code branch. Probably this code will be part of RT 3.10. Code at the moment is unstable, but eventually it wil be faster then the current version. 
> >>>>> 
> >>>>> On Mon, Sep 6, 2010 at 8:56 PM, Justin Hayes <justin.hayes at openbet.com> wrote:
> >>>>> So far we've tried installing RT on different hardware, both 32 and 64bit versions of linux. RT is still very slow for long tickets. All the time is taken up by the perl/apache process maxing out a core of CPU.
> >>>>> 
> >>>>> We've even gone as far as trying to profile the code. We came up with this graph of where the time was going:
> >>>>> 
> >>>>> <TIMING.png>
> >>>>> We then tried to go further into those functions but can't find a single smoking gun call that is taking all the time.
> >>>>> 
> >>>>> For example in a ticket that takes 22s to render approx 5 secs goes on these 2 lines:
> >>>>> 
> >>>>> File: Ticket/Elements/ShowHistory line: 100-103 version 3.8.8
> >>>>> 
> >>>>> 	my @trans_attachments = grep { $_->TransactionId == $Transaction->Id } @attachments;
> >>>>> 
> >>>>> 	grep { ($_->TransactionId == $Transaction->Id ) && ($trans_content->{$_->Id} = $_)  } @attachment_content;
> >>>>> 
> >>>>> Both are greps. Does this imply that perl itself is just slow?
> >>>>> 
> >>>>> IF so why would our perl be slow compared to other people's? We've tried compiling it from source and that made no difference.
> >>>>> 
> >>>>> ATM we're at a bit of a loss....
> >>>>> 
> >>>>> Justin
> >>>>> 
> >>>>> -------------------------------------------------
> >>>>> Justin Hayes
> >>>>> OpenBet Support Manager
> >>>>> justin.hayes at openbet.com
> >>>>> 
> >>>>> On 1 Jul 2010, at 11:51, Raed El-Hames wrote:
> >>>>> 
> >>>>>> Justin,
> >>>>>>  
> >>>>>> Do you use Transaction custom fields, if you do n?t ; try and comment out lines 70,71,72 from html/Ticket/Elements/ShowTransaction
> >>>>>> % if ( $Transaction->CustomFieldValues->Count ) {
> >>>>>>       <& /Elements/ShowCustomFields, Object => $Transaction &>
> >>>>>> % }
> >>>>>> See if that improves things for you.
> >>>>>> Some of our monitoring tickets can have up to 500 updates, such tickets use to take up to 20s to load, once I commented out the above lines, load time is now down to less than 5 seconds.
> >>>>>>  
> >>>>>> Regards;
> >>>>>> Roy
> >>>>>>  
> >>>>>>  
> >>>>>> From: rt-users-bounces at lists.bestpractical.com [mailto:rt-users-bounces at lists.bestpractical.com] On Behalf Of Justin Hayes
> >>>>>> 
> >>>>>> Sent: 01 July 2010 11:39
> >>>>>> To: Kenneth Crocker
> >>>>>> Cc: rt-users at lists.bestpractical.com
> >>>>>> Subject: Re: [rt-users] Slow Ticket History 3.8.8
> >>>>>>  
> >>>>>> We do Kenneth, but most tickets don't have many file attachments, so I assume that's not an issue?
> >>>>>>  
> >>>>>> Cheers,
> >>>>>>  
> >>>>>> Justin
> >>>>>> 
> >>>>>> -------------------------------------------------
> >>>>>> Justin Hayes
> >>>>>> OpenBet Support Manager
> >>>>>> justin.hayes at openbet.com
> >>>>>>  
> >>>>>> On 29 Jun 2010, at 17:54, Kenneth Crocker wrote:
> >>>>>> 
> >>>>>> 
> >>>>>> Justin,
> >>>>>> 
> >>>>>> I didn't see this mentioned and may have missed it, but are you displaying attachements inline? That might cut back on the I/O for History. Just a thought.
> >>>>>> 
> >>>>>> Kenn
> >>>>>> LBNL
> >>>>>> 
> >>>>>> On Tue, Jun 29, 2010 at 8:04 AM, Justin Hayes <justin.hayes at openbet.com> wrote:
> >>>>>> As a test we've just created a long ticket in an empty RT DB and it's very fast. So does look to be DB related - contrary to our earlier investigations.
> >>>>>> 
> >>>>>> I guess it must still access the DB resultset during the ticket rendering (which isn't how we thought it would work).
> >>>>>> 
> >>>>>> Time to tune the hell out of mysql then.......
> >>>>>> 
> >>>>>> Justin
> >>>>>> 
> >>>>>> -------------------------------------------------
> >>>>>> Justin Hayes
> >>>>>> OpenBet Support Manager
> >>>>>> justin.hayes at openbet.com
> >>>>>> 
> >>>>>> On 29 Jun 2010, at 15:53, Justin Hayes wrote:
> >>>>>> 
> >>>>>> > Seem to be quite a few things to look at Jason. Need to figure out what they all mean first.
> >>>>>> >
> >>>>>> > Justin
> >>>>>> >
> >>>>>> > -------- General Statistics --------------------------------------------------
> >>>>>> > [--] Skipped version check for MySQLTuner script
> >>>>>> > [OK] Currently running supported MySQL version 5.1.37-1ubuntu5.4-log
> >>>>>> > [OK] Operating on 64-bit architecture
> >>>>>> >
> >>>>>> > -------- Storage Engine Statistics -------------------------------------------
> >>>>>> > [--] Status: -Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
> >>>>>> > [--] Data in MyISAM tables: 611M (Tables: 8)
> >>>>>> > [--] Data in InnoDB tables: 10G (Tables: 20)
> >>>>>> > [!!] Total fragmented tables: 21
> >>>>>> >
> >>>>>> > -------- Performance Metrics -------------------------------------------------
> >>>>>> > [--] Up for: 19d 19h 32m 37s (110M q [64.266 qps], 222K conn, TX: 637B, RX: 39B)
> >>>>>> > [--] Reads / Writes: 98% / 2%
> >>>>>> > [--] Total buffers: 602.0M global + 134.8M per thread (150 max threads)
> >>>>>> > [!!] Maximum possible memory usage: 20.3G (262% of installed RAM)
> >>>>>> > [OK] Slow queries: 0% (229K/110M)
> >>>>>> > [!!] Highest connection usage: 100%  (151/150)
> >>>>>> > [OK] Key buffer size / total MyISAM indexes: 512.0M/6.7M
> >>>>>> > [OK] Key buffer hit rate: 100.0% (84M cached / 7K reads)
> >>>>>> > [OK] Query cache efficiency: 71.4% (76M cached / 107M selects)
> >>>>>> > [!!] Query cache prunes per day: 661360
> >>>>>> > [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 2M sorts)
> >>>>>> > [!!] Joins performed without indexes: 112714
> >>>>>> > [!!] Temporary tables created on disk: 33% (968K on disk / 2M total)
> >>>>>> > [OK] Thread cache hit rate: 99% (1K created / 222K connections)
> >>>>>> > [OK] Table cache hit rate: 36% (318 open / 880 opened)
> >>>>>> > [OK] Open file limit used: 14% (166/1K)
> >>>>>> > [OK] Table locks acquired immediately: 99% (39M immediate / 39M locks)
> >>>>>> > [!!] InnoDB data size / buffer pool: 10.1G/8.0M
> >>>>>> >
> >>>>>> > -------- Recommendations -----------------------------------------------------
> >>>>>> > General recommendations:
> >>>>>> >    Run OPTIMIZE TABLE to defragment tables for better performance
> >>>>>> >    Reduce your overall MySQL memory footprint for system stability
> >>>>>> >    Reduce or eliminate persistent connections to reduce connection usage
> >>>>>> >    Adjust your join queries to always utilize indexes
> >>>>>> >    When making adjustments, make tmp_table_size/max_heap_table_size equal
> >>>>>> >    Reduce your SELECT DISTINCT queries without LIMIT clauses
> >>>>>> > Variables to adjust:
> >>>>>> >  *** MySQL's maximum memory usage is dangerously high ***
> >>>>>> >  *** Add RAM before increasing MySQL buffer variables ***
> >>>>>> >    max_connections (> 150)
> >>>>>> >    wait_timeout (< 28800)
> >>>>>> >    interactive_timeout (< 28800)
> >>>>>> >    query_cache_size (> 16M)
> >>>>>> >    join_buffer_size (> 2.0M, or always use indexes with joins)
> >>>>>> >    tmp_table_size (> 128M)
> >>>>>> >    max_heap_table_size (> 64M)
> >>>>>> >    innodb_buffer_pool_size (>= 10G)
> >>>>>> >
> >>>>>> >
> >>>>>> > -------------------------------------------------
> >>>>>> > Justin Hayes
> >>>>>> > OpenBet Support Manager
> >>>>>> > justin.hayes at openbet.com
> >>>>>> >
> >>>>>> > On 29 Jun 2010, at 15:22, Jason Doran wrote:
> >>>>>> >
> >>>>>> >> Hi,
> >>>>>> >> If you are using mysqld have a look at "mysqltuner.pl" perl script (google)
> >>>>>> >> This has fixed quickly many performance issues on both RT and other
> >>>>>> >> web-based software we use. I run this every few weeks and apply suggested
> >>>>>> >> changes and then simply restart mysqld when things are quite.
> >>>>>> >>
> >>>>>> >> Regards,
> >>>>>> >> Jason Doran
> >>>>>> >> Computer Centre
> >>>>>> >> NUI, Maynooth
> >>>>>> >>
> >>>>>> >> On 29 Jun 2010, at 14:09, 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
> >>>>>> >>
> >>>>>> >
> >>>>>> >
> >>>>>> > Discover RT's hidden secrets with RT Essentials from O'Reilly Media.
> >>>>>> > Buy a copy at http://rtbook.bestpractical.com
> >>>>>> 
> >>>>>> 
> >>>>>> Discover RT's hidden secrets with RT Essentials from O'Reilly Media.
> >>>>>> Buy a copy at http://rtbook.bestpractical.com
> >>>>>> 
> >>>>>> 
> >>>>>> Discover RT's hidden secrets with RT Essentials from O'Reilly Media.
> >>>>>> Buy a copy at http://rtbook.bestpractical.com
> >>>>>>  
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> RT Training in Washington DC, USA on Oct 25 & 26 2010
> >>>>> Last one this year -- Learn how to get the most out of RT!
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> -- 
> >>>>> Best regards, Ruslan.
> >>>> 
> >>>> 
> >>>> RT Training in Washington DC, USA on Oct 25 & 26 2010
> >>>> Last one this year -- Learn how to get the most out of RT!
> >>> 
> >>> 
> >>> RT Training in Washington DC, USA on Oct 25 & 26 2010
> >>> Last one this year -- Learn how to get the most out of RT!
> >> 
> >> 
> >> 
> >> RT Training in Washington DC, USA on Oct 25 & 26 2010
> >> Last one this year -- Learn how to get the most out of RT!
> >> 
> >> 
> >> 
> >> -- 
> >> MFG
> >> 
> >> Torsten Brumm
> >> 
> >> http://www.brumm.me
> >> http://www.elektrofeld.de
> > 
> > 
> > 
> > 
> > -- 
> > MFG
> > 
> > Torsten Brumm
> > 
> > http://www.brumm.me
> > http://www.elektrofeld.de
> 

> 
> RT Training in Washington DC, USA on Oct 25 & 26 2010
> Last one this year -- Learn how to get the most out of RT!

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