[rt-users] RT Runs VERY Slowly...

[Stevo]

Anything thing I noticed is that I have plenty of swap space and NONE of
it's being used...  is there a way to get mod_perl to utilize all that free
swap?!!

--Stevo

----- Original Message ----- 
From: "Jamie Lawrence" <jal at jal.org>
To: "Mike Husband" <m.husband at leadup.com.au>
Cc: "'Stevo'" <checkpoint at ozbergs.com>; <RT-Users at lists.bestpractical.com>
Sent: Thursday, April 29, 2004 10:20 PM
Subject: Re: [rt-users] RT Runs VERY Slowly...


> On Fri, 30 Apr 2004, Mike Husband wrote:
>
> > There has been a lot on the list about performance over the last few
months.
> >
> > Release 3.0.10 has made some improvement for us.
> > Also making sure our database is vacuumed daily.
> >
> > The following also made a big difference.
> >
> > [ From
http://lists.fsck.com/pipermail/rt-users/2002-August/009562.html ]
> > > Apache/mod_perl is often a culprit, well, mostly mod_perl, I think.
> > > Make sure you have Apache processes set to die after a certain
> > > number of requests. If you set the number to 0, they won't die,
> > > and it'll just bog down. Our installation used to run relatively
> > > quickly at first, but as those processes lived on, the machine
> > > slowed to a crawl; changing this setting fixed this gradual
> > > slowdown. Not sure if this is in the docs, but it should be...
> >
> > Modified /usr/local/apache/conf/httpd.conf and changed:
> > MaxRequestsPerChild 0
> > to:
> > MaxRequestsPerChild 100
> > then restarted Apache. 100 might be too low - I'm not sure - we will
> > see how performance goes in the next few days.
>
> I don't know much about your situation, but one thing many people
> underestimate with mod_perl is the cost of memory. It starts out mostly
> shared, but copy-on-write over time kills that. Too many processes and
> you're very, very quickly swapping. RT is a rather heavyweight app,
> memory-wise, and seems to behave in a non-memory-conservative fashion,
> so you'll feel that quickly.
>
> -j
>
> -- 
> Jamie Lawrence                                        jal at jal.org
> Fascists divide in two categories: the fascists and the
> anti-fascists.
>    - Ennio Flaiano
>
>