Sreeni,
Thank you for posting your question. In this case, I would recommend opening a formal support ticket for this case, as determining the nature of load spikes requires deep analysis of logs that may not be appropriate in this format. When you open the ticket, please include the following:
Environment Details:
* Policy Server/Web Agent versions
* Operating System version
* Agent web server versions
Logs:
* Policy server trace logs from high thread events, set up as indicated in the following document: Work with Support - CA Single Sign-On - 12.52 SP1 - CA Technologies Documentation
* Web Agent trace logs from the same time period as indicated in the above document
* smps.log files with policy server -stats output from the same time period
This should give us enough to work with to determine the root cause and provide accurate next steps. If you do end up opening a support case, please mark your CA Communities question as "Answered" and we will take it from there.
Thank you.