Re: Rep:Re: Re: [f-cpu] optional SRB

[Martin Devera <devik@cdi.cz>]

It will use normal swap mechanism - expunge unused pages to
get space for new. With large scattered  accesses you end
with MM trashing :(
In Linux 2.4 there was a lot of fimilar issues around 2.4.10.
devik

On Mon, 25 Nov 2002, Nicolas Boulay wrote:

> When you're file didn't fill the memory what happen ? (256 MB of RAM,
> 500 Mo of file ?) ?
>
> nicO
>
> -----Message d'origine-----
> De: "Christophe Avoinne" <christophe.avoinne@laposte.net>
> A: <f-cpu@seul.org>
> Date: 25/11/02
> Objet: Re: Re: [f-cpu] optional SRB
>
> Personnaly, I use mmap() a lot when I need to read or write a file with
> complex structures. That way, I access the file as if it is a memory
> thru
> word or structure pointers. It is very convenient for a search algorithm
> or
> creating a structural file. You don't need to explicetely use lseek(),
> read() or write() functions, just a msync() or a munmap() then a close()
> at
> the end. Not speaking about the share and access rights you can give at
> this
> memory.
>
> ----- Original Message -----
> From: <whygee@club-internet.fr>
> To: <f-cpu@seul.org>
> Sent: Monday, November 25, 2002 2:53 PM
> Subject: Re: Re: [f-cpu] optional SRB
>
>
> >De: Michael Riepe
> >
> >On Mon, Nov 25, 2002 at 02:52:01AM +0100, Yann Guidon wrote:
> >
> >> PS : i recently attended a conference about GNU/Hurd and i have
> >> seen some Hurd sourcec code. It's very far from POSIX but
> >> one of the most crazy things i've seen is ... mmap() used for doing
> >> a malloc() .....
> >
> >Huh? Linux (glibc) does that all the time (and has been doing it for
> >many years), if the requested size is big enough.
>
> O gawd ....
> Then how do they manage the situations where there is a lot
> of fragmentation, or when "garbage collection" must be done ?...
>
> > Michael "Tired" Riepe
> YG (back from Mars)
>
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