Originally posted by: SystemAdmin

Dear all,
Am trying to calculate de memory utilization of a AIX device(no need for process pertaining info also am aware of de fact tat usually AIX boxes will utilize sth around 99%..but I want to know howmuch n how it can be calculted..) ..tried svmon but it seems to be work only when the user is login as root... for me i need to calculate it as a normal user..Any help???
Thanks
Muthukumaran.M
#AIX-Forum

Originally posted by: SystemAdmin

Muthu: are you trying to figure out the extent to which memory is over-committed on the box as a whole? I'm not sure I've understood your question but I think that's what you're after. If so you should be able to get what you want from nmon. It will show numbers for computational versus non-computational memory. The reason that overall numbers in AIX usually show as 99+% is that whatever memory isn't used for working set (computational) pages is given over to file pages (non-computational). As memory starts to be more fully committed you should expect to see the percentage of computational pages increase.

HTH

Jim Lane
#AIX-Forum

Originally posted by: SystemAdmin

Thanks JIM... but that doesnt help me either.. since nmon is not a in-built package IBM site itself claims that you cant expect it to be installed in every machine.. Same problem for me.. The device 4 which am trying to find de Total Memory Utilization dont have the nmon tool... Anyother tool that comes with AIX default package..
#AIX-Forum

Originally posted by: SystemAdmin

Hi,

Give this a try:

1. Use NMON to get the total memory on the server
(for example: Total(MB) 16384.0MB)

1. Issue: vmstat 1

2. Record the average avm value
(for example: 1161888)

kthr memory page faults cpu

---

-----------

---

------------

---

r b avm fre re pi po fr sr cy in sy cs us sy id wa
0 2 1161913 1023 0 2 0 14718 20558 0 1954 6838 3689 8 13 62 17
0 1 1161888 1087 0 9 0 15101 19732 0 1933 3306 3403 6 16 66 12
1 0 1161888 983 0 0 0 13807 15780 0 1767 2729 3215 5 14 66 14
3. We have avm 1161888 x 4096 = 4,759,093,248

Versus memory 16384 x 1024 x 1024 = 17,179,869,184
As a side note:
If avm is lower than RAM, then paging-space paging could be caused by RAM being filled up with file pages. In that case, tuning the minperm,maxperm, and maxclient values, could reduce the amount of paging-space paging

Hope this helps,

Joseph Karpinski
#AIX-Forum

Originally posted by: SystemAdmin

Muthu: I realize that nmon isn't standard. That shouldn't be a problem because you can easily install it yourself. Have a look at http://www-128.ibm.com/developerworks/eserver/articles/analyze_aix/index.html
for all the details.

-Jim
#AIX-Forum

Originally posted by: SystemAdmin

One other area to check is shared memory.

Issue ipcs -am and sum up the SEGSZ values of your shared memory segments:
T ID KEY MODE OWNER GROUP CREATOR CGROUP NATTCH SEGSZ
m 0 0x704ecfbc --rw-r----- oracle dba oracle dba 45 369,901,568
m 1 0xffffffff --rw-rw---- root system root system 1 4,096
m 2 0xc5d07ab4 --rw-r----- oracle dba oracle dba 83 755,777,536
m 3 0x0d023b26 --rw-rw---- root system root system 2 1,440
m 4 0x827d9cd0 --rw-r----- oracle dba oracle dba 10 319,569,920
m 5 0x79b3a2b0 --rw-r----- oracle dba oracle dba 22 369,901,568
m 6 0x00003039 --rw-rw-rw- oracle dba oracle dba 1 4,304
m 7 0xffffffff --rw-rw---- root system root system 1 4,096
m 8 0xffffffff --rw-rw---- root system root system 1 4,096
m 9 0x41545200 --rw-rw-rw- root system root system 0 1,048,576

Total 1,816,217,200

Best regards,

Joseph Karpinski
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