Re: Avoiding OOM on overcommit...?

From: Horst von Brand (vonbrand@pincoya.inf.utfsm.cl)
Date: Mon Mar 20 2000 - 16:46:46 EST


Jesse Pollard <pollard@tomcat.admin.navo.hpc.mil> said:

[...]

> Without overcommit:
> You can support 100 simultaneous connections, with full saturation of
> each server, with no failures.
>
> Result: happy customers, happy management, maybe even a raise.

Management nagging about supporting more pages, worried by waste of several
Gb of disk that has never, ever been touched. System is sluggish, needs
constant tweaking of "resource allocation quotas" as applications crash,
even there are resources available. Seriously consider firing inept
sysadmin.

> If you overcommit:
> You might support 100 simultaneous connections, but not full saturation
> of each server, without aborting some connections or crashing the
> server/system.
>
> Result: some unhappy customers, not so happy management, difficulty
> in identifying problems, and definitely no raise.

Other customers are unhappy because of long download times, NS (or
whatever) crashing, not getting to the site because of (local or remote)
network congestion. The "catastrophe" isn't even a blip on the sysadmin's
screen.

> So you used 2G byte of swap - I know where you can by 18GB of swap for about
> $300 US...

-- 
Dr. Horst H. von Brand                       mailto:vonbrand@inf.utfsm.cl
Departamento de Informatica                     Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria              +56 32 654239
Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513

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