SAP Slow Response Times for certain Users, Very Good Response Times for other Users

Requirements

The R/3 Extended Memory is completely filled; dialog work processes are switched to PRIV mode.

Procedure

Use Transaction SM50 to determine the work processes in the PRIV mode.

Possible causes /Corrective action

• No more R/3 Extended Memory is available.

In this example, work processes 5 and 6 cannot allocate any more Extended Memory because the pool is used up, although its limit for ztta/roll_extension would still allow Extended Memory. They switch into PRIV mode prematurely (see Allocating Memory for User Contexts)

Action:

Increase the R/3 Extended Memory pool ( em/initial_size_MB: Extended Memory Pool Size) to prevent the work processes from being switched to PRIV mode.

• The limit for the Extended Memory is too low for most user contexts (set with parameter
ztta/roll_extension). Many contexts allocate heap memory and switch to PRIV mode.

Action:

Increase the limit for the Extended Memory using ztta/roll_extension.

• The limit for the Extended Memory for one user context (ztta/roll_extension) is too high. A few user contexts can completely fill the entire Extended Memory, whereby other processes are switched into PRIV mode before the limit is reached.

Decrease the limit for the Extended Memory (set with parameter ztta/roll_extension), or increase the Extended Memory (see ztta/roll_extension).