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The graphic below shows the SAP application server resources relevant for parallel RFC.

This graphic is explained in the accompanying text.

RFC Resources on the Application Server


Resources can be assigned from the following areas:

Logging On to the SAP System

A total of rdisp/tm_max_no users can be simultaneously logged on to the server (using the GUI or RFC). If rdisp/rfc_max_login percent of the maximum number of users are logged on, no more RFC logons can be accepted. An RFC user may occupy a maximum of rdisp/rfc_max_own_login percent of the login slots.

You can display a user overview in transaction SM04 (Displaying and Managing User Sessions).

RFC Requests in the Dialog Queue

The dialog queue of the dispatcher contains rdisp/elem_per_queue entries. A maximum of rdisp/rfc_max_queue percent of these may be filled by RFC requests.

You can display a server overview in transaction SM51 (Overview of SAP Application Servers).

Entries in the Communication Table

The communication table contains an entry for every CPIC communication for all parties involved. The table can contain a maximum of rdisp/max_comm_entries entries. rdisp/rfc_max_comm_entries You can display a server overview in transaction SM51 (Overview of SAP Application Servers).

Dialog Work Processes

When the server is started, it has rdisp/wp_no_dia dialog work processes. This number can, however, be changed while the server is running. One way to do this is to use operation mode switching. You can find out the current number of processes in the Process Overview (transaction SM50; see also Displaying and Controlling Work Processes). Of the dialog work processes, the dispatcher keeps rdisp/rfc_min_wait_dia_wp free for “genuine”dialog requests (not RFC).

A user may occupy a maximum of rdisp/rfc_max_own_used_wp percent of dialog processes.

Note Note

The same parameters are used to control the number of plug-in requests (HTTP or SMTP requests coming from the ICM) that can be processed at the same time.

End of the note.


The dispatcher checks whether it has free resources for each RFC request it receives. If it has, it assigns the request to a dialog work process, otherwise it puts the request in the dispatcher queue. You can control the detail level of this check using parameter rdisp/rfc_check.

More Information

Transaction SARFC is used to monitor the resources on all servers in the SAP system.

For more information, see Monitoring RFC Resources on the Application Servers.