Setting the Profile Parameters (iSeries)
Use
The optimum parameter settings are dependent on:
Procedure
The following table is a guide for setting the profile parameters for the iSeries platform
|
Parameter |
Unit |
Default Setting |
Recommendation |
Comment |
| abap/heaplimit: Work Process Restart |
Bytes |
40000000 (40 MB) |
40 MB |
|
| ztta/roll extension: Extended Memory Limit |
Bytes |
2 GB |
Possibly lower depending on application. |
Absolute upper limit: 2 GB. |
| abap/heap_area_dia: Heap Memory Limit for Dialog Work Processes |
Bytes |
2 GB |
2 GB |
|
| abap/heap_area_nondia: Heap Memory Limit for Non-Dialog Work Processes |
Bytes |
2 GB |
2 GB |
|
| abap/heap_area_total: Heap Memory Limit |
Bytes |
2 GB |
2 GB |
You can use the operating system monitor (ST06) to monitor physical storage and ASP usage. Allocated unprotected temporary storage includes the allocated memory of:
You can look at this in detail using Transaction ST02 ® Detail analysis ® Storage. |
| em/initial_size_MB: Extended Memory Pool Size |
MB |
8092 |
8190 MB maximum |
|
| rdisp/ROLL_SHM: Roll Buffer Size |
8 KB blocks |
0 |
0 |
Do not define a value higher than 12500 (100 MB) unless the CCMS Tune Summary (Transaction ST02) under Monitoring the Memory Management System states that a larger roll buffer is required.Absolute upper limit: 250000 blocks (2 GB) for special applications |
| rdisp/ROLL_MAXFS: Maximum Roll File Size |
8 KB blocks |
0 |
0 |
Absolute upper limit: 250000 blocks (2 GB) for special applications |
| rdisp/PG_SHM: Paging Buffer Size |
8 KB blocks |
32768 |
32768 |
Absolute upper limit: 250000 blocks (2 GB) for special applications |
| rdisp/PG_MAXFS: Maximum Size of the SAP Paging File |
8 KB blocks |
32768 |
32768 |
Absolute upper limit: 250000 blocks (2 GB) for special applications |
| ztta/roll_first: Initial Allocation Size from the Roll Area |
Bytes |
1 byte |
1 byte |
This value is set automatically and cannot be changed. |
| ztta/roll_area: Roll Area |
Bytes |
3 MB |
3 MB |
This value is set automatically and cannot be changed. |
| em/blocksize_KB: Segment Size for the Extended Memory |
KB |
4096 (4 MB) |
4096 (4 MB) |
|
