How fileCursor works? AMQ5.9.1

[fengcanyue]

     hi：
I have one producer and one consumer, producer is fast,but consumer is
slower.
so i wish memroyLimit is reached,the message will store to disk .
but the fileCursor don not work well. The MemoryPercentUsage has reached
100,but i don not find file under tmp_storage/

who can tell me why？

   my xml config is as follow:
             <policyEntry topic=">" producerFlowControl="true"
memoryLimit="5mb" >
                  <pendingSubscriberPolicy>
                    <fileCursor />
                  </pendingSubscriberPolicy>
                </policyEntry>
 systemUsage is as follows:
      <systemUsage>
            <systemUsage>
                <memoryUsage>
                   <memoryUsage limit="100 mb"/> 
                </memoryUsage>
                <storeUsage>
                    <storeUsage limit="100 gb"/>
                </storeUsage>
                <tempUsage>
                    <tempUsage limit="50 gb"/>
                </tempUsage>
            </systemUsage>
        </systemUsage>



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