Memory Usage on AIX

sril
sril used Ask the Experts™
on
Hi All,

lsattr -El sys0 | grep realmem

The above command output gives a value. Is that the actual memory on a AIX server or is it the memory available on the server?

i need to find out the actual memory of the server , available memory now and also the memory usage of the process running on the server.

Can any one expalin with example cos iam confused with numbers it gives when i use nmon, or svmon commands?
Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Most Valuable Expert 2013
Top Expert 2013
Commented:
Hi,
lsattr -El sys0 | grep realmem
shows "real" memory, either actual hardware in case of a standalone box, or the amount of assigned memory in case of a virtual LPAR.
In any case, the OS sees it as "hardware", and the shown value doesn't say anything about memory usage.
I'd recommend using "topas" for analysis.
On it's main display, at the right under MEMORY you'll see details of memory usage
(In the following I'll quote the man page)
              Real,MB
                   The size of real memory in megabytes.
 [same as with lsattr ... (wmp)]
             % Comp
                   The percentage of real memory currently allocated to computational page frames. Computational page
                   frames are generally those that are backed by paging space.
              % Noncomp
                   The percentage of real memory currently allocated to non-computational frames. Non-computational page
                   frames are generally those that are backed by file space, either data files, executable files, or
                   shared library files.
              % Client
                   The percentage of real memory currently allocated to cache remotely mounted files.

 Below you'll see
 PAGING SPACE
            Displays the size and use of paging space. The following data is reported:
              Size,MB
                   The sum of all paging spaces on the system, in megabytes.
              % Used
                   The percentage of total paging space currently in use.
              % Free
                   The percentage of total paging space currently free.

In the middle, under PAGING you can see the Virtual Memory Manager at work -
PAGING
            Displays the per-second frequency of paging statistics. The following data is reported:
              Faults
                   The total number of page faults taken per second over the monitoring interval. This includes page
                   faults that do not cause paging activity.
              Steals
                   The physical memory 4 K frames stolen per second by the virtual memory manager over the monitoring
                   interval.
              PgspIn
                   The number of 4 K pages read from paging space per second over the monitoring interval.
              PgspOut
                   The number of 4 K pages written to paging space per second over the monitoring interval.
              PageIn
                   The number of 4 K pages read per second over the monitoring interval. This includes paging activity
                   associated with reading from file systems. Subtract PgspIn from this value to get the number of 4K
                   pages read from file systems per second over the monitoring interval.
              PageOut
                   The number of 4 K pages written per second over the monitoring interval. This includes paging activity
                   associated with writing to file systems. Subtract PgspOut from this value to get the number of 4K pages
                   written to file systems per second over the monitoring interval.
              Sios
                   The number of I/O requests per second issued by the virtual memory manager over the monitoring
                   interval.

I'd really advise you to issue "man topas" to learn more. This manpage is really good and detailed!
wmp

Author

Commented:
Thanks a ton..!

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial