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

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Message-ID: <Pine.LNX.4.61.0710221328160.9412@chaos.analogic.com>
Date:	Mon, 22 Oct 2007 13:34:05 -0400
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.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

On Sun, 21 Oct 2007, Ravinandan Arakali (rarakali) wrote:

> Hi Vaidy,
> Thanks for clarifying several of my doubts.
>
> To answer your question about my intention, we currently have a
> system with 2 GB RAM and I need to find out the actual used and
> free memory so that we can decide if the same setup(applications,
> tmpfs etc.) can run on another system with lesser memory.
>
> Is it correct to say that the "used" field "free -m" excluding
> buffers/caches would give the correct idea of used memory
> (I mean does it take care of shared memory, shared copies of
> libraries etc.) ? I assume it does not include /dev/shm usage
> since that's also a tmpfs partition ?
>
> If so, then I can add the memory used by tmpfs partitions to
> the above and get the total memory used ?
>
> For eg. if my "free -m" appears as below:
> Linux(debug)# free -m
>             total       used       free     shared    buffers
> cached
> Mem:          2014        984       1030          0         80
> 594
> -/+ buffers/cache:        309       1705
>
> Can I say that 309MB + 350 MB(size of tmpfs partitions including
> /dev/shm)
> is the used memory on my system ?
>
> Thanks,
> Ravi
>
[Snipped...]

Just boot your present system with MEM=nnn on the command-line,
where nnn is the amount of memory you would like to use in the
new system (like this).

title Fedora Core (2.6.16.24)
 	root (hd0,0)
 	kernel /boot/vmlinuz-2.6.16.24 ro root=LABEL=/ mem=768m nmi_watchdog=0 
rhgb reboot=cb
 	initrd /boot/initrd-2.6.16.24.img

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.59 BogoMips).
My book : http://www.AbominableFirebug.com/
_

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