This script splits a log file into multiple files, one for each combination of process ID (PID) and thread ID (TID) based on the
information in the header of the pinlog entries.

The output of above command run creates a file with below naming convention-

cm.pinlog.pid.tid.pinlog  (Ex: cm.pinlog.247681.14.pinlog)

Practical usage of splitPinlog Perl file:
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Suppose you have a set of CMs to handle AAA requests via AAA Gw. Using this script, you can find that whether AAA Gw is balancing AAA requests through the CM pool properly or not through Volume Testing.

More information regarding this feature can be found out from BRM documentation:-

BRM Documentation - System Administration Guide - Monitoring and maintaining your BRM system - Using logs to monitor components - About formatting log files