If one of the following criteria is not fulfilled, no resources are made available for the parallelization with asynchronous RFC (or triggered by the system in the exceptional case RESOURCE_FAILURE):
Number of dialog work processes: 1
This default value is 1 and can be specified using the profile parameter rdisp/rfc_min_wait_dia_wp. As standard, a certain number of dialog work processes are kept free as reserve instances for other purposes, such as system logon or administration programs. For this reason, a greater number of dialog processes must be free, than the number specified for the profile parameter rdisp/rfc_min_wait_dia_wp.
Percentage of user-related dialog work processes: 75%
You can change this default value using the profile parameter rdisp/rfc_max_own_used_wp. The number of dialog work processes is defined using the profile parameter rdisp/wp_no_dia.
Percentage of pending requests in the dialog wait queue: 5%
This default value (5% of the entire length of the dialog wait queue) can by changed by the rdisp/rfc_max_queue profile parameter. The length of the dialog queues is defined using the profile parameter rdisp/elem_per_queue.
Percentage of system logons: 90%
If the percentage of users already logged on exceeds this, then no resources are released. You can change this default value using the profile parameter rdisp/rfc_max_login. The maximum number of logons to a server is configured using the profile parameter rdisp/tm_max_no.
Percentage of own system logons: 25%
You can change this default value (25% of all logons) using the profile parameter rdisp/rfc_max_own_login. For each RFC, a logon to the target system takes place.
Percentage of user communication entries: 90%
Every server has a limited number of communication channels. The default limit value is 90 per cent. You can change this value using the profile parameter rdisp/rfc_max_comm_entries. The maximum number of communication channels is configured using the profile parameter rdisp/max_comm_entries. Here, one entry for each connection is made for the client and server.
For further information, please use the following link:
Configuration of System Resources for aRFC, tRFC, qRFC
Continue by reading the following: