Quoting Dean Michael Berris <[EMAIL PROTECTED]>:

> is it possible to use shared memory defined on one box from another?
> i've considered using NFS, but is there a way wherein i can have two
> computers operating independent of each other, and have one process on
> one machine define a shared memory segment, then have another process on
> another machine access it via the network?

hmmmm... distributed shared memory? ;) thesis... thesis... thesis...


> is there a standard way of doing this, withouth having to resort to
> mounting an NFS volume on each machine where the shared memory segment
> would be defined?
> 
> i'm looking if i could do it using the standard libraries, withouth
> having to use PVM or MPI. i've also been looking at mosix, but i'd like
> to do it without those technologies first.


There was an undergrad thesis at DLSU implementing a DSM over PVM. With that 
implementation, shared memory allocation was partly being handled by the PVM 
and so with the message passing concern (communication). According to my 
adviser, they will be building another one but this time, it will be on top of 
MPI. So shared memory allocation will be handled on the higher level (w/in 
their DSM software) while leaving the network communication at the MPI level. 
Most papers I've read about software-oriented DSM have used the MPI as the base 
architecture. They only differ on the higher level, that is, how they present 
the DSM address space to the programmer. It could be a page-based DSM, or as 
shared objects accessible via well-defined set of operations as insert, delete, 
etc. I'll be implementing a DSM, probably, I'll use the MPI. I'll be using this 
implementation to further verify the results of my thesis on access semantics-
driven DSM, which I'm defending on Tuesday. Currently, I'm only using a 
simulator for a lazy release consistent DSM to verify my claim.

wtg dean!


-- 
When you innovate, you've got to be prepared for everyone telling you you're 
nuts! --larry ellison

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