pages_before_pager
Parameter
- Description
-
Defines part of a system threshold that immediately frees pages after an I/O completes instead of storing the pages for possible reuse. The threshold is
lotsfree + pages_before_pager
. The NFS environment also uses this threshold to curtail its asynchronous activities as memory pressure mounts. - Data Type
-
Signed integer
- Default
-
200
- Range
-
1 to amount of physical memory
- Units
-
Pages
- Dynamic?
-
No
- Validation
-
None
- When to Change
-
You might change this parameter when the majority of I/O is done for pages that are truly read or written once and never referenced again. Setting this variable to a larger amount of memory keeps adding pages to the free list.
You might also change this parameter when the system is subject to bursts of severe memory pressure. A larger value here helps maintain a larger cushion against the pressure.
- Commitment Level
-
Unstable