[Mono-list] HttpWebResponse concurrency problems

[erasend]

Im having trouble with concurrent HttpWebRequests/Responses scaling in our
Mono 2.10.2 environment (Apache2). These are server-side requests made out
to a REST API.

We are mimicking concurrent users by running these requests on separate
threads and as the number of threads increases, the response time(s)
increase as well. (i.e, 1 user = 300ms, 5 users=1500ms, etc) The exact same
application in my local dev environment (.NET/Win7) scales as expected with
no problems.

We have increased ServicePoint.ConnectionLimit and have the following Apache
configuration settings set in httpd.conf:

MonoMaxActiveRequests (appname) 0
MonoMaxWaitingRequests (appname) 0

and in our mono application's configuration file:
MonoSetEnv MONO_THREADS_PER_CPU=2000 

Looking at a traffic monitor, it looks as though all HttpWebRequests are
opened sequentially - as expected - but then only 1 or 2 ports/connections
handle the responses. This would obviously cause a significant bottleneck.

It is not network related as a similar PHP application works/scales as
expected.

Any thoughts? 

Thanks much.

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