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Paging Rate

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Operating Systems AIX Paging Rate
# 1  
Old 01-28-2010
Paging Rate
Hi Friends,

Can you please answer the following questions.


1) What is Paging rate ?

2) How to Calculate Paging rate from the following topas command output?
Code:
Faults      206   Real,MB   28671 
Steals      311   % Comp     71.1 
PgspIn        1   % Noncomp  28.8 
PgspOut       0   % Client   28.8 
PageIn      305                  
PageOut      11    PAGING SPACE    
Sios          316   Size,MB   76800 
                        % Used     23.3 
                        % Free     77.7

Thanks in advance
Panditt
Last edited by Scott; 01-28-2010 at 01:53 PM.. Reason: Please use code tags
# 2  
Old 01-28-2010
Paging rate depends on your memory size.. If you lack memory than paging will start
Code:
 vmstat

System configuration: lcpu=40 mem=16384MB ent=2.00

kthr    memory              page              faults              cpu
----- ----------- ------------------------ ------------ -----------------------
 r  b   avm   fre  re   pi  po  fr   sr  cy  in   sy  cs us sy id wa    pc    ec
 1  1 446478 295685 0   0   0   0   0    0   0   6  111 179  0  0 99  0  0.01   0.3

so if you often see that paging is high number (non zero) than U should better to increase server memory
# 3  
Old 01-28-2010
Pagging rate
(computer science) The number of pages per second moved by virtual storage between main storage and the page data set.

When system is short on physical memory (RAM) it moves some "pages" from RAM to swap storage. When required it will read them back. This is called paging. Page is a unit of memory and is architecture dependent, but usually mean 4KB of RAM.

So paging rate is how fast the system is moving pages between RAM and swap in "pages per second" as unit.

I don't think you can read paging rate using this output. You may try to compare some subsequent outputs and count the result using the difference, but I'm not familiar with this output.
# 4  
Old 01-28-2010
I do not understand what you need to know but from your output, I would guess you have set lru_file_repage to 1 and if so you should set it to 0 and your system will stop using so much pagingspace.

Kind regards
zxmaus
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