[rt-users] Performance and responsetime in RT 3.0.10

Palle Girgensohn girgen at pingpong.net
Sun May 2 07:26:27 EDT 2004


Hi,

We have terrible response times, at least 6-7 seconds, often more, 
sometimes enough to make fastcgi give up (max time set to 30 s).

Please note that this is *not* mainly a problem with the database, it is 
more or less *only* perl that uses the CPU. My guess is you will get the 
same results if you check using e.g. top. I just checked logging in to our 
RT, and the after hitting the login button with my credentials typed in, it 
took approx 25 seconds to load the "Home" page. Hitting "Home" again loads 
the page in about 6-7 seconds, since things are cached in the session, I 
guess... Anyway, checking the database log, of the 25 seconds spent only 
3.5 s where spent running database queries. Top shows about 15% load on 
postgresql and 100% load on perl (2 CPUs, remember). Nothing else loads the 
machine.

We don't have a very fancy machine, which might explain the slowness to a 
certain degree. Two 450 MHz P3s.

One thing about the postgresql queries is bad, there's a mail thread about 
this a while back, but I believe it is postgresql specific - the 
SearchBuilder uses lower() on IDs, so indices are not used. Still only 
10-15 % of the time is spent in the database, so there is something else, 
something in the perl code.

I've had this discussion a few times before on the list, but I'm not sure 
there is any way to fix this? Perhaps it is just the design of RT? 
Hopefully throwing faster hardware at RT will help, but it is a pity.

I have FreeBSD 4.9, Postgresql-7.4.2, Perl 5.8.3, RT 3.0.10

/Palle

--On fredag, april 30, 2004 14.13.32 +0200 Hilde Therese Lauvset 
<Hilde.Lauvset at cc.uit.no> wrote:

>
>
>
>
>   _____
>
> Fra: Hilde Therese Lauvset
> Sendt: 30. april 2004 14:07
> Til: 'rt-users at bestpractical.com'
> Emne: Performance and responsetime in RT 3.0.10
>
>
>
> Hi,
>
>
>
> We think RT's response time is very low. It take about 6-7 seconds to
> load a new page every time. I was wondering if anybody has the same
> response time; better or worse. I have tried to do some research on how
> to better the performance and has done a few changes, but with no luck.
>
>
>
> Is there an idea to use indexing in the mysql database? Or isn't the
> database a problem at all?
>
>
>
> If anyone has an idea of what we can do, so please give us a hint.
>
>
>
>
>
> Here are our settings:
>
>
>
> Machine: 2 CPU with 1 GHz and 1 GB RAM
>
>
>
> RT-3.0.10
>
> Apache 2.0
>
> Fastcgi 2.4.2
>
> Mysql 4
>
> --------------------------------------------------------
>
> httpd.conf:
>
>
>
> LoadModule fastcgi_module modules/mod_fastcgi.so
>
> AddHandler fastcgi-script fcgi
>
> FastCgiServer /opt/rt3/bin/mason_handler.fcgi
>
>
>
>
>
> NameVirtualHost xxx.xxx.x.x:80
>
>
>
> <VirtualHost xxx.xxx.x.x:80>
>
>         ScriptAlias / /opt/rt3/bin/mason_handler.fcgi/
>
>         ServerName blabla
>
>         DocumentRoot /opt/rt3/share/html
>
>         AddDefaultCharset UTF-8
>
>
>
>
>
> </VirtualHost>
>
>
>
>
>
># hack to fix graphics with fastcgi
>
> NameVirtualHost xxx.xxx.x.x:81
>
>
>
> <VirtualHost xxx.xx.x.x:81>
>
>         DocumentRoot /opt/rt3/share/html/NoAuth/images
>
> </VirtualHost>
>
>
>
>
>
>
>
> PerlSetVar MasonCodeCacheMaxSize 20000000
>
> PerlSetVar MasonStaticSource 1
>
>
>
> If you find something strange in my httpd.conf file please tell me :-)
>
>
>
> Hilde Therese
>
>
>
>
>
>
>
>
>







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