Application Server with Over 50 Users (UNIX)
The correct configuration for the memory management system in large SAP application servers depends on the several factors. SAP can therefore not give any recommendations for the standard configuration. However, you can calculate your own approximate values by referring to the information in this unit and in the other units that are referred to.
To determine the required resources for the host system, contact your hardware partner’s SAP Competence Center. Then you can configure the SAP Server by setting the SAP memory management parameters in the SAP system profile.
Main Memory and Swap Space on the Host System
|
Resource |
SAP Recommendation |
|
Size of swap space |
Minimum: the greater of the 2 following numbers:
In each case, this must be larger than the sum of:
|
|
Main memory |
Guidelines: Central system with all services, no database: 180 MB plus 5.7 MB per active user or at least 512 MB With database: Add 150 MB plus 0.3 MB per active user Application server: 120 MB plus 5.3 MB per active user More memory increases performance. Also contact your hardware partner or the SAP Competence Center for your hardware partner. |
SAP Profile Parameters
How to use the individual parameters is described in
Profile Parameters of Memory Management.|
Parameter |
Recommended Value |
| abap/heaplimit |
20000000 (20 mil. bytes) |
| abap/heap_area_dia |
2000000000 (2 GB) |
| abap/heap_area_nondia |
Platform dependent, see the parameter documentation |
| abap/heap_area_total: Heap Memory Limit |
2000000000 (2 GB); see the parameter documentation |
| em/initial_size_MB: Extended Memory Pool Size |
UNIX: 5 MB per active user + 1.5 MB per user; minimum 256 MB Windows NT: 8192 |
| em/stat_log_size_MB: Statistics - User Context Size |
20 |
| em/stat_log_timeout: Statistics - User Context Size |
600 |
| rdisp/ROLL_MAXFS: Maximum Roll File Size |
UNIX: 32768 (32768 8KB blocks) Windows NT: the same value as rdisp/ROLL_SHM |
| rdisp/ROLL_SHM: Roll Buffer Size |
8192 blocks or 1 MB per active user up to a maximum of 16.500 blocks (100 MB), unless more memory is required (analysis with Transaction ST02) |
| rdisp/PG_MAXFS: Maximum Size of the SAP Paging File |
32768 (32768 8KB blocks) |
| rdisp/PG_SHM: Size of the Paging Buffer |
1024 blocks |
| ztta/roll_area: Roll Area |
6500000 (6.5 mil. bytes) |
| ztta/roll_first: Size of the Initial Allocation from the Roll Area |
1000000 (1 mil. bytes) If more than 5 MB of extended memory is available per user (em/initial_size_MB), you can set this value to 1 (1 byte). Windows NT: 1 (1 byte) |
| ztta/roll_extension: Limit for Extended Memory |
256000000 (256 mil. bytes),except for background servers under IBM AIX and Siemens-Nixdorf SINIX You can find more information in the parameter documentation |
The settings listed here are recommended base values that you may, however, have to change if you monitor and optimize your SAP System. For more detailed information, see
Monitoring the Memory Management System and Profile Parameters of Memory Management.
Check the changes to the system profiles using the program sappfpar. For more information, see
Operating System and Hardware Requirements.