rdisp/jvm_pool is a SAP Parameter attribute which is used to control pooling of java vms active ? information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
With this parameter itis possible to activate or deactive the pooling of
Java VMs of the VMC (Virtual Machine Container). Pooling means that a VM
is started after a request is put in a pool and can execute further
requests, if required. The VM is ended if pooling is not activated.
Pooling is recommended for performance reasons.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.