[Beowulf] size of swap partition
Guilherme Menegon Arantes
garantes at iq.usp.br
Tue Jun 10 09:53:15 EDT 2008
On Tue, Jun 10, 2008 at 06:13:00AM -0700, beowulf-request at beowulf.org wrote:
> Date: Tue, 10 Jun 2008 00:58:12 -0400 (EDT)
> From: Mark Hahn <hahn at mcmaster.ca>
> Subject: Re: [Beowulf] size of swap partition
> To: Gerry Creager <gerry.creager at tamu.edu>
> Cc: Mikhail Kuzminsky <kus at free.net>, beowulf at beowulf.org
> it is possible to tune how the kernel responds to memory crunches -
> for instance, you can always avoid OOM with the vm.overcommit_memory=2
> sysctl (you'll need to tune vm.overcommit_ratio and the amount of swap
> to get the desired limits.) in this mode, the kernel tracks how much VM
> it actually needs (worst-case, reflected in Committed_AS in /proc/meminfo)
> and compares that to a commit limit that reflects ram and swap.
> their real/virtual ratio. the kernel only enforces RLIMIT_AS
> (vsz in ps),assuming a 2.6 kernel - I forget whether 2.4 did
> RLIMIT_RSS or not.
And that brings me to another related question: Where I can get more
information about VM usage/tunning options (such as vm.overcommit_ratio,
RLIMIT_AS, etc) and VM metrics (such as vmstat) for the current linux
kernels (>= 2.6.18)? I have looked on /usr/src/linux/Documentation/vm
but anywhere else with more accessible/digested info?
Guilherme Menegon Arantes, PhD São Paulo, Brasil
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