Kbase 20910: Suggestions for VMTune on AIX.
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
3/19/2005 |
|
Solution ID: 20910
GOAL:
Suggeston for tuning the AIX virtual memory in certain conditions.
FIX:
When running an AIX system and use 50% or more of the RAM on that system for Progress shared memory (one or more databases with large -B settings) benefits may be gained from the following setting for vmtune:
vmtune -p 5 -P 6
-p minperm:
Specifies the point below which file pages are protected from the repage algorithm. This value is a percentage of the total real-memory page frames in the system.
The specified value must be greater than or equal to 5.
-P maxperm:
Specifies the point above which the page stealing algorithm steals only file pages. This value is expressed as a percentage of the total real-memory page frames in the system.
The specified value must be greater than or equal to 5.
These settings used in conjunction are meant to reduce the amount of excessive paging that might occur if using large amounts of RAM for Progress database servers.