linux-kernel - Re: Question about free/used memory on Linux

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Date:	Wed, 14 Nov 2007 11:58:04 +0000
From:	Pádraig Brady <P@...igBrady.com>
To:	"Ravinandan Arakali (rarakali)" <rarakali@...co.com>
CC:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
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)

Pádraig.
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