AppFabric Cache - Performance

Question

I have developed a RESTful `WCF` service (`WebHttpBinding`), which is an AppFabric Cache client. I ran a performance test using jMeter. The test plan contained one operation in the service, which will be called in 100 concurrent threads.

However, I noticed that after running the test, `the first 20 to 30 threads are taking considerable amount of time to get the response (say 10-15 seconds)` and then all the other remaining threads will complete their execution in 2-3 seconds with AppFabric Cache related code turned on. Whenever I comment the AppFabric related code, it works just fine. Please note that I use only Get, no Put.

My service has the below configurations as t AppFabric:

  

    <dataCacheClient requestTimeout="60000" channelOpenTimeout="15000" maxConnectionsToServer="2">
        <localCache isEnabled="true" sync="NotificationBased" ttlValue="300000" objectCount="100000" />
        <clientNotification pollInterval="10" maxQueueLength="100000" />
        <hosts>
          <host name="**********" cachePort="*******" />      
        </hosts>
        <securityProperties mode="Transport" protectionLevel="EncryptAndSign" />
        <transportProperties connectionBufferSize="131072" maxBufferPoolSize="268435456" maxBufferSize="8388608" maxOutputDelay="2" channelInitializationTimeout="60000" receiveTimeout="600000" />
      </dataCacheClient>

Could someone please give some pointers as to what is causing this initial delay?

 

 

 

 

Answer 1

Are the first threads blocking while waiting for the creation of the datacachefactory ? This is an expensive operation as it establishes connections to each node in the cluster.

Answer 2

Hi,

The DataCacheFactory will already be initialized at the application start. The operation that I am trying to test will have the DataCacheFactory already avaiable by the time I start testing. The DataCacheFactory is static and is available across the application for all operations once the application is up.