[Mono-list] HttpWebResponse concurrency problems

erasend sirrus at gmail.com
Tue Apr 3 17:36:54 UTC 2012

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:

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

Any thoughts? 

Thanks much.

View this message in context: http://mono.1490590.n4.nabble.com/HttpWebResponse-concurrency-problems-tp4529621p4529621.html
Sent from the Mono - General mailing list archive at Nabble.com.

More information about the Mono-list mailing list