Re: openMosix Question
From: Moritz Franosch (mail_at_Franosch.org)
Date: 07/07/03
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Date: 07 Jul 2003 11:42:18 +0200
Noah Roberts <nroberts@dontemailme.com> writes:
> openMosix advertizes itself as not needing any special requirements
> of the programmer
Openmosix even has no programming interface.
> but it is not clear what kind of applications they are
> talking about.
Processes with single threads. These processes may communicate over
the network.
> If openMosix really does make several nodes act like a
> single SMP computer
It does not. This may be a longterm goal of Openmosix. The website is
misleading.
> then there should be no special requirements when
> working with shared memory and threads.
Processes that work with shared memory or use multiple threads can't
be "migrated" to another machine.
> On the other hand I am skeptical that this is actually what is going
> on; it doesn't seem reasonable to expect that memory can be shared
> across nodes,
Why not? Except that Gigabit Ethernet may be too slow.
> which is what would be required of such a system.
> I wish to develop a parallel application that will need to share a
> large amount of data amongst all of its subprocesses. Is it really as
> seamless as the openMosix site leads me to believe or would I still be
> required to deal with the shared memory aspect?
The processes would have to communicate over the network. Look at
libraries (like MPI) for developing parallel applications.
> It would certainly make my life a lot easier to just be able to
> spawn threads and it all magically works,
Unfortunately, no. And even if it worked, it would possibly be (much?)
slower than handcrafted communication designs like you would use with
e.g. MPI.
> but this just doesn't seem like it would work out the way I want.
Moritz
-- Dipl.-Phys. Moritz Franosch http://Franosch.org
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