DSPOPT parameter
Data space options
Summary
- Default value
- X'00'
- Parameter type
- System
- Where set
- On User 0's parameter line
- Related products
- All
- Introduced
- Model 204 V6.1 or earlier
Description
The bits have the following meanings:
| Settings | Meaning |
|---|---|
| X'01' | For servers in memory, do server swapping by moving 4 K pages, which is faster than moving byte by byte.
This setting is applicable only for real dataspaces for non-64-bit systems. |
| X'02' | Put servers in a hiperspace instead of a dataspace.
This setting is applicable only for real dataspaces for non-64-bit systems. |
| X'20' | Put APSY precompiled procedures in hiperspace instead of a dataspace. Hiperspace pages can be in either real or expanded storage.
This option is not valid on IBM z/VSE and requires that Model 204 be APF-authorized. |
| X'40' |
Put APSY precompiled procedures in cache hiperspace instead of a scrolling hiperspace. Cache hiperspace pages can reside in only expanded storage, so they are sometimes called ESO (for Expanded Storage Only) hiperspaces. Also, cache hiperspace pages never result in operating system paging. Pages stolen by the operating system are simply discarded and Model 204 is responsible for replacing the pages from the copy of the precompiled procedures in CCATEMP. This option is not valid on IBM z/VSE and requires that Model 204 be APF-authorized. |
| X'80' |
Keep all APSY saved pages in CCATEMP. Set DSPOPT to X'80' only when TEMPPAGE=0, and then only in unusual circumstances. |