RE: Find memory used by a process

["Reidy, Ron" <Ron.Reidy@xxxxxxxxxxxxxxxxxx>]

Raj,
 
This took a little digging, but here are the answers:
 
1.  I assume you are using Linux.  If not, this may not be correct ...
 
The /proc filesystem will provide you with the data you want.  To see the size 
of memory consumption, issue this command:
 
cat /proc/PID/status | egrep '(^Vm)' | cut --field=2 --delimiter=':'
 
The above will yield the sizes of all the segments of memory the process is 
using at the time the command is issued.  Add them up, and that is your total 
memory consumption for the process.  This information can be parsed using the 
Perl module Linux::stat.  For those who do not know or care to use Perl 
(GAAA!), there is a Tcl script here ( 
http://ldas-cit.ligo.caltech.edu/doc/tcl_docs/html/procfstcl.html - procfs.tcl) 
which may do the same thing.
 
If you are leery about using Perl, Tcl, or looking directly at the /proc 
filesystem, consult the ps(1) man page on your system.
 
2.  For sorting using the 'ps' command, you will need to consult the sort(1) 
man page on your system.
 
3.  PGA memory is seen in v$session.  For SGA usage, I'm also not sure about 
this at this time.
 
I also highly recommend the book Optimizing Linux Performance.  This book is 
very good with lots of tool and usage suggestions for monitoring and diagnosing 
Linux performance.
 
Happy investigating.
 

----------------- 
Ron Reidy 
Lead DBA 
Array BioPharma, Inc. 

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On 
Behalf Of raja rao
Sent: Monday, August 01, 2005 7:19 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Find memory used by a process 



Hi All,
 
when I issue
ps -efl |grep 7309
 8 S   oracle  7309     1  0  46 22        ? 504289        ?   Jul 27 ?        
0:01 oracledev (LOCAL=NO)
 
it is giving the memory used by this process is 504K. Where as when I did the 
top or pmap for this process

it is showing around 4GB (which includes shared mem and private mem)
 
Can someone throw somelight on this, what is the exact memory used by the above 
process ?
 
(also how to get the sort by SIZE column in ps -efl 
 
(and how to get the details from oracle database howmuch mem being used by a 
session).
 
Thanks in advance
Raj
 

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