On 2006.02.03, Nima <[EMAIL PROTECTED]> wrote:
> What basically happens is that once I have more than 150 users logged in 
> the response time for a page takes a minute or more which is very 
> frustrating for users.
> We have three linux boxes. One for an aolserver with database connection, 
> one for a static aolserver and one for the database.
> The database box never goes above 5-10%. The static server is also not 
> very busy but the dynamic server can go upt to 99% and a load of 10 and 
> more.

Sounds like you already answered your question: you need more dynamic
servers and do load balancing across them.

> AOLServer config.tcl
> ...
> ns_section ns/server/${server}
> ns_param directoryfile $directoryfile
> ns_param pageroot $pageroot
> ns_param maxconnections 100
> ns_param keepalivetimeout 15
> ns_param maxdropped 0
> ns_param maxthreads 65
> ns_param minthreads 65
> ns_param threadtimeout 3600

If you have 150 concurrent users, maxconnections = 100 could be a
factor.  maxthreads = 65 ... do you have that many concurrent

I'd suggest raising maxconnections to, say, 500 (just to rule that out
entirely) and observe the effects.  I might raise maxthreads to 120,

Of course, all of this tweaking and tuning won't have as much impact as
actually optimizing your application code.  Unfortunately, I'm not very
familiar with dotlrn or OpenACS to be able to speak to specific things
you should look at.  Maybe someone else can speak up about those things?

> ns_section ns/db/pool/pool1
> ...
> ns_param connections 100
> ...
> ns_section ns/db/pool/pool2
> ...
> ns_param connections 60
> ...
> ns_section ns/db/pool/pool3
> ...
> ns_param connections 30
> ...

Do you have any kind of statistics from the DB side?  What's the max
number of concurrent connections you've actually seen, according to the

-- Dossy

Dossy Shiobara              | [EMAIL PROTECTED] | http://dossy.org/
Panoptic Computer Network   | http://panoptic.com/
  "He realized the fastest way to change is to laugh at your own
    folly -- then you can let go and quickly move on." (p. 70)

AOLserver - http://www.aolserver.com/

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