[rt-users] Slow Ticket History 3.8.8

Tue Jun 29 12:54:49 EDT 2010

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
>
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