WCF Throttle Settings

Question

I have been working on a proof of concept using WCF and MSMQ. I have been playing around with the throttle settings using the defaults This Article and also adding my own settings to the config file. I have 2 Quad Core Xeon CPUs running this application. No matter what settings I apply it always only appears to grab 8 messages at a time (Which matches my processing cores). I want each of the messages to be handled in a single transaction so that could be part of the issue...not sure. I jsut assumed it would handle a lot more messages concurrently than it is.

Service Behavior:

   [ServiceBehavior(UseSynchronizationContext = true,
                     ReleaseServiceInstanceOnTransactionComplete=true,
                     ConcurrencyMode = ConcurrencyMode.Single,
                     InstanceContextMode = InstanceContextMode.PerCall)]

Endpoint Behavior:

  <endpointBehaviors>
    <behavior name="endpointBehavior">
      <transactedBatching maxBatchSize="1" />
    </behavior>
  </endpointBehaviors>

My own Service Throttling:

<serviceThrottling maxConcurrentCalls="128" maxConcurrentSessions="800" />

Am I overlooking something? Maybe I just don't fully understand the default / custom throttle settings (Likely).

EDIT

I have modified the ConcurrencyMode (Changed to Multiple) along with the ReleaseServiceInstanceOnTransactionComplete setting. Changing to Multiple didn't seem to change anything?

EDIT Is it maybe the TransactionBatch setting? I have that set to one...?

Thanks,

S

Answer 1

I found a blog that pointed me to some good documentation on WCF throttling / performance. I added some more meta output to my processing application and was able to get the performance I was looking for. By adding more information to my process (ManagedThreadID, etc) I could see I was getting a lot more throughput than I had originally assumed. I also found some of the tips in the blog below to be helpful.

Blog

Thanks,

S