WCF: Debugging WCF Throttling

Behavior:

w3wp process stops responding to the incoming request and recycling app pool fixes the problem.

Data Collection:

Download and Install DebugDiag from

Click cancel.

Go to process tab.

Select the w3wp process and right click and say - create full user dump

Analysis

Let us search the WCF Security context object and observe the throttling values .....

To get there, we need object of service host .....

!dumpheap -stat

0x000007fef6a56a90 1 248 System.ServiceModel.ServiceHost

We got the Method table ...

Now let us get the address .....

0:036> !dumpheap -mt 0x000007fef6a56a90

Using our cache to search the heap.

Address MT Size Gen

0x00000000ff66d358 0x000007fef6a56a90 248 1 System.ServiceModel.ServiceHost

Now we got the object .... let us !do it ...

0:036> !do 0x00000000ff66d358

Name: System.ServiceModel.ServiceHost

MethodTable: 000007fef6a56a90

EEClass: 000007fef6413680

Size: 248(0xf8) bytes

GC Generation: 1

(C:\Windows\assembly\GAC_MSIL\System.ServiceModel\3.0.0.0__b77a5c561934e089\System.ServiceModel.dll)

Fields:

We need to find the service throttle object now .....

Analyzing the Session object ....

Solution

We need to add a Service behavior on server side and increase this value .....

<serviceThrottling

maxConcurrentCalls="1"

maxConcurrentSessions="1"

maxConcurrentInstances="1"

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