A site we are moving from asp to asp.net has a weird problem. During slow
times it's fine and performs great, however when each server gets about 50
to 60 requests/sec, performance is still great but out of the blue the
memory usage goes from 200-300 mb aspnet_wp and keeps going until the
process gets recycled, it is then fine for a short while. We have made sure
there aren't any large datatables loading or any other sort of data that
could be building up. We also set the sql server to stop any with a cost
over 10 seconds for any connections coming from application. We can not
mimic this in our development environment, it only exists on our web farm of
three servers and it happens on all three servers sporadically. We can not
pin point it to any operation or page. However we are using a few COM
objects that have not been recoded in .NET yet such as jpeg manipulation and
encryption. Does anyone have any ideas how to pinpoint the problem, any ways
to determine what object or code is the culprit. This is still unnoticed by
our customers due to the sql state + load balancer and web farm.. but it
gets very expensive on the processors during busy times to have the
aspnet_wp restart as often as 10 minutes or so during heavy load times.
-Bill
