Hello Andreas,
Thanks for many more hints about the possible problems.
Only one remark at the moment about one of the points:
And database traffic in general: During my unintended "public
performance test" I had a situation where database connection were
not all accepted by our MySQL server and I saw many warnings/errors
in the imp log with the names of the new groupware components
which we had not in use before. I got the impression that these
program parts create a lot of background activity even when they
are not really used.
You have not really mentioned in your first post but from this i
guess the biggest problem is the DB load?
- You need to allow as many connections to the database as you have
webserver processes and maybe persistant connections could help.
This last one was the simple cause of the DB connection problems. I
had increased the MaxClients on the Apache side to a higher values
than the max_user_connections on the DB server.
OTOH there was no significant load on the DB server, only on the webserver.
I have yet to determine the real bottleneck, enough memory was
available, CPU was more saturated. What several people noted, that
there was a unusual high amount of system CPU used, but so far no one
had a good idea where this could come from.
Best regards,
Jochen Roderburg
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