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Sonja,
The 'fre' column is not exactly as it appears. It appears to show free RAM
memory pages at 4K each. However pages are not given back to the fre list
until needed. In particular when the system uses large amounts of memory
from for I/O caching then these pages are given back only when the free list
is getting empty.
The sum of the 'avm' and 'fre' columns do not need to add up to the real
memory size of the machine. (roughly transcribed from the AIX Survival
Guide)
What exactly is the problem you have identified here?
John
-Original Message-
From: Sonja Sehovic [mailto:[EMAIL PROTECTED]]
Sent: 02 May 2001 15:20
To: Multiple recipients of list ORACLE-L
Subject:Strange report from 'vmstat'
Hi all!
Oracle 8.1.7 on AIX (8GB RAM (+ swap space 9GB)).
It concerns AIX memory 'problem'.
When I issue vmstat command, we got following result:
/u01/app/oracle/product/8.1.7.vmstat 2 4
kthr memory page faultscpu
- --- ---
r b avm fre re pi po fr sr cy in sy cs us sy id wa
0 0 580556 554 0 0 0 14 34 0 126 137 63 11 5 82 1
0 2 580556 549 0 0 0 00 0 708 527 206 0 0 99 0
0 2 580557 548 0 0 0 00 0 829 99854 421 2 10 88
0
0 2 580557 548 0 0 0 00 0 637 111 35 0 0 99 0
Analysing this output, it seams that we have cca 2GB RAM (example:
(580557 +
548)* 4096 = 2,2 GB), while we expected min 8GB.
This gap between 8GB and output from vmstat report, increases in
time.
The question is if our calculation was right, is this the right way
to
analyse this at all?
Maybe it is important to say, that our Oracle is installed on OFA
using data
files, max size 2GB, in same volume group(not on raw devices).
Do you know of any AIX memory problems which can manifests as
mentioned
above?
TIA,
Sonja
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