[Beowulf] size of swap partition

Eric Thibodeau kyron at neuralbs.com
Thu Jun 12 18:32:13 EDT 2008


You can check out the following:

http://linux-mm.org/LinuxMM

Guilherme Menegon Arantes wrote:
> 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?
>
> Regards,
>
> Guilherme
>
> --
>
> Guilherme Menegon Arantes, PhD       São Paulo, Brasil
> ______________________________________________________
>
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>   


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