> > So in effect with this scheme a large hardware coherent NUMA machine
> > would essentially be X seperate linux kernels (X=# of nodes) running a
> > distributed smpfs to coordinate access to memory, IO, inodes, etc..
>> I don't see how that will make your kernel/kernels any more
> efficient, you're
> basically applying a distributed computing model to parallel
> computing which
> involves more work
>> > Now imagine one day someone actually implements such a thing for
> > linux. The only difference between such a machine and a bunch of PCs
> > would be the hardware memory access...
> > just one more step of someone writing code to implement the NUMA stuff
> > over, eg ethernet or UDP. And hey presto... distributed linux will be
> > born.
I've missed some of this discussion (emails got downloaded to
my home PC before I had a chance to read them from work), but
what you're describing seems quite similar to VMS clustering.
A VMS cluster has a cluster-wide disk/tape namespace, a
cluster-wide process ID namespace, a cluster-wide distributed
lock manager namespace/database and cluster-wide logical names
(think of environment variables on steroids). Oh yeah - I forgot
cluster-wide batch and print queues.
If you added a generic intra-cluster mechanism for remoting
_any_ I/O devices (which, to a first approximation sounds
pretty straightforward), such as terminals and network
interfaces, then you've basically got cluster-wide access
to _everything_ except local memory on each node. And that
could probably be hacked through the page fault handlers...
Hmmm... Must get a cluster up and running at home some day
and play around with it :-)
Of course, to get Linux to this stage, we're going to need
industrial-strength distributed file systems. GFS looks nice...
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