Re: page movements
- From: Robert Binkley <leebinkley@xxxxxxxxx>
- Date: Wed, 1 Nov 2006 07:10:48 -0800
A very low scan rate is a sure indicator that the system is not running short of physical memory. On the other hand, a high scan rate can be caused by transient issues, such as a process reading large amounts of uncached data. The processes on the system should be examined to see how much of a long-term impact they have on performance.
A nonzero scan rate is not necessarily an indication of a problem. Over time, memory is allocated for caching and other activities. Eventually, the amount of memory will reach the lotsfree memory level, and the pageout scanner will be invoked. For a more thorough discussion of the paging algorithm
The cyclical page cache uses a file system free list to cache filesystem data only. Other memory objects are managed on a separate free list. (This second list would include application binaries, shared libraries, applications and uninitialized application data.)
With the new algorithm, filesystem cache only competes with itself for memory.
----- Original Message ----
From: "Miller, Dave (I.S.)" <Dave.Miller@xxxxxxx>
To: aix-l@xxxxxxxxxxxxx
Sent: Wednesday, November 1, 2006 7:39:48 AM
Subject: page movements
Can anyone give me a clue why there is so much page freeing attempts going on, when there is really no paging to speak of? Thanks.
lsps -s
Total Paging Space Percent Used
16896MB 1%
#
$ vmstat 2
System Configuration: lcpu=8 mem=16384MB
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
7 1 2537883 1108 0 0 0 124 22 0 1351 74234 15052 13 8 78 2
0 1 2537888 1029 0 0 0 4023 9219 0 15039 113591 26711 14 12 63 11
57 1 2537899 1019 0 0 2 4372 9063 0 20961 161866 32899 23 18 50 9
1 1 2537157 1047 0 0 0 3853 9614 0 13325 93476 22418 10 10 70 10
4 1 2537201 1799 0 0 0 4196 11351 0 20350 71356 27313 24 18 49 9
1 2 2537528 964 0 0 0 4355 9927 0 20309 118391 32853 24 18 45 13
2 1 2537529 1002 0 0 2 5266 76798 0 22953 111951 34246 20 17 54 9
0 1 2537158 1052 0 0 1 3407 8278 0 9664 70486 36157 10 15 63 11
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