Spark job profiler results showing high TCP cpu time

[Reth RM]

Running a spark job on local machine and profiler results indicate that
highest time spent in
*sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.* Screenshot of
profiler result can be seen here : https://jpst.it/10i-V

Spark job(program) is performing IO (sc.wholeTextFile method of spark
apis), Reads files from local file system and analyses the text to obtain
tokens.

Any thoughts and suggestions?

Thanks.