title: Service instances in WCF
body: <p>I'm using perfmon to examine my service behaviour. What I do is I launch 6 instances of client application on separate machines and send requests to server in 120 threads (20threads per client application).</p>
  
  <p>I have examined counters and maximum number of instances (I use PerSession model and set number of instances to 100) is 12, what I consider strange as my response times from service revolve around 120 seconds... I thought that increasing number of instances will cause WCF to create more instances, and as a result response times would be quicker.</p>
  
  <p>Any idea why WCF doesn't create even more instances of service?</p>
  
  <p>Thanks Pawel</p>