@LakshmiNarayann

re: "what is acceptable HEAP size for PEGA?"

I would always refer to the platform installation guide.

For example, from the Application server requirements section of the Pega Platform 84 installation guide for tomcat/oracle:

Memory requirements: Pega Platform runs in memory (heap) on Java Virtual Machines (JVMs). In general, all activity is distributed over multiple JVMs (nodes) on the application server.

◦ Standard suggested system heap size is 4 - 8 GB based on monitoring of memory usage and garbage collection frequency.

◦ Larger heaps are advisable if your applications allow a high number of concurrent open tasks per session or cache a large collection of transaction or reference data.

◦ The host application server memory size must be at least 4 GB larger than the Pega Platform heap size to allow space for the operating system, monitoring tools, operating system network file buffering, and JVM memory size (-XMX option).

The minimum host application server memory size is 8 GB: 4 GB heap + 4 GB for native memory, operating system, and buffering

If the server does not have enough memory allocated to run Pega Platform, the system can hang without an error message. The correct memory settings depend on your server hardware, the number of other applications, and the number of users on the server, and might be larger than these recommendations