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Subject: RE: Question about free/used memory on Linux
Date: Wed, 14 Nov 2007 10:18:24 -0800
Message-ID: <FA6FB5FA4DA6BF4386D129273B2E3EC3024B85A3@xmb-sjc-214.amer.cisco.com>
In-Reply-To: <473AE2CC.4080609@draigBrady.com>
Thread-Topic: Question about free/used memory on Linux
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References: <FA6FB5FA4DA6BF4386D129273B2E3EC3024B847B@xmb-sjc-214.amer.cisco.com> <471BA1D1.5040905@linux.vnet.ibm.com> <FA6FB5FA4DA6BF4386D129273B2E3EC3024B847C@xmb-sjc-214.amer.cisco.com> <471C3A17.5020400@linux.vnet.ibm.com> <FA6FB5FA4DA6BF4386D129273B2E3EC3024B859E@xmb-sjc-214.amer.cisco.com> <473AE2CC.4080609@draigBrady.com>
From: "Ravinandan Arakali (rarakali)" <rarakali@cisco.com>
To: =?iso-8859-1?Q?P=E1draig_Brady?= <P@draigBrady.com>
Cc: "Vaidyanathan Srinivasan" <svaidy@linux.vnet.ibm.com>,
       "Linux Kernel" <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
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Thanks Padraig.

Any idea how to get the size of running linux kernel ?

Ravi 

-----Original Message-----
From: P?draig Brady [mailto:P@draigBrady.com] 
Sent: Wednesday, November 14, 2007 3:58 AM
To: Ravinandan Arakali (rarakali)
Cc: Vaidyanathan Srinivasan; Linux Kernel
Subject: Re: Question about free/used memory on Linux

Ravinandan Arakali (rarakali) wrote:
> Hi Vaidy,
> What do you think is the right way to get the memory usage of a 
> process, I mean the actual physical memory used ? Basically, I'm 
> interested in the incremental cost of a process, which means, I don't 
> want to include the text segments of shared libraries which would 
> remain even after the process is killed (since it would be used by 
> other processes).
> 
> Is the RSS field of "ps aux" command the right one or use "pmap" 
> command and look at the "writeable" segments ?

I already commented on this thread with a python script for reporting RAM usage for programs.

RSS = Private and Shared Resident pages.
You can get the shared value for a process from /proc/$$/smaps (as is done in the script)

P?draig.
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