queryperf timedout

Hi ,

     I am using java vsphere  sdk 5.0.

I have an sample code which  will connect to vcenter server and collect the cluster performance metrics (cpu usage)  using queryperf method.  This code is working fine in small environment. But in large environment where we have 50 to 100 vsphere servers in vcenter server version 5.0 ,the queryperf method was timedout. How to fix this.

Regards,

Karthika