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Subject: Re: [OMPI users] Question on virtual memory allocated
From: Olivier Riff (oliriff_at_[hidden])
Date: 2010-05-15 15:53:29


Thank you Jeff for your explaination. It is much clearer now.

Best regards.

Olivier

2010/5/15 Jeff Squyres <jsquyres_at_[hidden]>

> On May 12, 2010, at 8:19 AM, Olivier Riff wrote:
>
> > What I do not understand is where the value of 2104m for the virtual
> memory comes from.
> > When I add the value of Mem used (777848k) to the value of the cache
> (339184k) : the amount is by far inferior to the Virtual memory (2104m).
> > Are here part of the memory allocated by the clients taken into account ?
>
> No, top only shows the data from one machine.
>
> > Where are physically allocated these 2104m of data ?
>
> They may be in physical memory and may also be swapped out on disk.
>
> Keep in mind that the virtual memory encompasses *all* memory for an
> application -- its code and its data. Hence, this also includes shared
> libraries (which may be shared amongst several processes on the same
> machine), process-specific instructions, process-specific data, and shared
> process data.
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
> For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/
>
>
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