Hey all!
We're having an issue under high loads that's causing AOLserver to stop
taking new connections and I wanted to see if anyone could point me in
the right direction for diagnosing the problem.
We're running AOLserver 4.5 on CentOS 5.2 with the following connection
config:
ns_section "ns/server/main"
ns_param connsperthread 0
ns_param maxthreads 500
ns_param minthreads 10
ns_param threadtimeout 120
ns_param maxconnections 100
ns_param spread 20
The DB pool is set up as follows:
ns_section "ns/db/pool/main"
ns_param Connections 500
ns_param Datasource "$databaselocation:$databasename"
ns_param Driver postgres
ns_param LogSQLErrors Off
ns_param MaxIdle 600
ns_param MaxOpen 3600
Watching the system stats under load, the web server is only hitting
about 5% CPU usage and has ample free RAM. The DB server is only at
about 3% capacity.
The problem we're seeing is that the web servers are maxing out at about
200-250 simultaneous connections, and all additional connections are
being rejected.
Any guesses on why we don't have 500 connections available, even though
that's what's indicated in ns/server/main? Under 3.x, I remember that
there was an option to have queued pending connections. I don't see
that option in the docs for 4.5. Does that functionality still exist?
Any suggestions would be greatly appreciated!
-William
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