Profile Parameters of Memory Management
Profile parameters enable you to set up your memory management system to get maximum benefit from it. By setting the parameters correctly, you can adjust memory management exactly to your resources and requirements.
The default parameter settings usually ensure the smooth operation of your memory management system. Monitoring the Memory Management System enables you to uncover possible weak spots.
This section explains what each parameter does. The different settings for each platform are described in the Platform-Specific Description of Memory Management.
The parameters govern how the memory management system behaves and restrict it so that it does not exceed operating system or hardware limitations. Certain parameters may restrict individual work processes, and quotas may limit resources used by all work processes, for example, the extended memory. There are also parameters that are used for configuring memory management statistics.
Controlling Memory Management
Memory Management Resources for One Work Process
ztta/roll_extension: Limit for Extended Memory
ztta/roll_extension_dia: EM Limit for Dialog Work Processes
ztta/roll_extension_nondia: EM Limit for Non-Dialog Work Processes
abap/heap_area_dia: Heap Memory Limit for Dialog Work Processes
abap/heap_area_nondia: Heap Memory Limit for Non-Dialog Work Processes
abap/heap_area_total: Total Limit for Heap Memory
ztta/roll_area: Roll Area
ztta/roll_first: Size of the Initial Allocation from the Roll Area
Memory Management Limitations
abap/heap_area_total: Heap Memory Limit
em/initial_size_MB: Extended Memory Pool Size
rdisp/ROLL_SHM: Roll Buffer Size
rdisp/ROLL_MAXFS: Maximum Roll File Size
rdisp/PG_SHM: Size of the Paging Buffer
Memory Management Statistics
Parameters for Controlling the Release of SAP Memory for the Operating System
es/disclaim_coasting_time_alloc
es/disclaim_coasting_time_free
For more information, see Release of SAP Memory for the Operating System