WCF Service Throttling

Question

I have a WCF service deployed in a console app with BasicHTTPBinding and SSL enabled. The following attribute is set as well:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

I have also set the throttling behavior to

<serviceThrottling maxConcurrentCalls="2147483647" maxConcurrentSessions="2147483647"
        maxConcurrentInstances="2147483647" />

On the other hand I have created a test client (for load test) that initiates multiple clients simultaneously (multiple threads) and performs transactions on the server. Everything seems fine but on server the CPU utilization doesn't increase so I added some logging to view the number of concurrent calls to the server and found that it never went over 6.

I have reviewed the performance counter logging code more than twice and it seems fine to me.

So I want to ask where is the problem in this situation? I haven't specified any kind of ContextMode or ConcurrencyMode yet.

After this Post I noticed that whenever i start another Intance of Test Client my concurrent Server Calls counter increase to 2 like if i am running only 1 instance the maximum Concurrent Rcvd Calls will be 2 and if there are two instance the same value goes to 4 and so on. Is there any limit of Number of WCF Calls from once process?

********Added on 17-March********

Today I ran another test with one test client (with 50 concurrent users) on the same machine on which the server is running. This time I am getting the exact result what I wanted it to show (i.e. Maximum concurrent Calls Rcvd by Server = 50).

But I need to do it the same on others machines as well. Can anybody help me on this?

score 23 · Answer 1 · answered Aug 19 '11 at 07:59

23

Or use this configuration in the client.

<system.net>
    <connectionManagement>
      <add maxconnection = "200" address ="*" />
    </connectionManagement>
  </system.net>

Here 200 is the limit from the client

answered Aug 19 '11 at 07:59

Arun

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It is described here http://www.codeproject.com/KB/aspnet/10ASPNetPerformance.aspx and perhaps you need to know this http://support.microsoft.com/kb/969189 – NoWar Nov 30 '11 at 17:50
MSDN: [ Element (Network Settings)](https://msdn.microsoft.com/en-us/library/fb6y0fyc.aspx) – Mike Guthrie Aug 15 '16 at 20:12
i added maxconnection="100" address = "*" but no luck getting timeout error in WCF – Arul Sidthan Oct 13 '16 at 08:35

score 19 · Accepted Answer · edited Oct 06 '16 at 00:09

19

I found a solution: there is a connection limit on ServicePointManager that was causing this problem. To remove this limit you just need to set

System.Net.ServicePointManager.DefaultConnectionLimit = X;

where the default limit is 2.

edited Oct 06 '16 at 00:09

thesquaregroot

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answered Mar 19 '10 at 05:31

Mubashar

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From @JuliaS: Where does this line go? Is this a client or WCF service setting? – Brock Adams Nov 29 '11 at 08:25
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sorry for late reply: this goes to any .net application which makes multiple concurrent outbound connection to any server. – Mubashar Oct 10 '12 at 03:12

WCF Service Throttling

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