[Beowulf] shared memory versus MPI and bootless boot

[Mark Hahn]

> > if your ram disk or local storage is 128MB, over a 2Mbps connect, i make
> > it 8 mins, nearer 9 to load which is... urm slow.
> >
> > again this for a 100Mbps hub you would get 10.24 seconds per node.
> 
> Ah thanks for noticing this, hadn't realized this timing problem yet!

well, 128M of traffic to boot is pretty extreme.  I haven't tcpdumped it,
but it looks like around 2-4MB is all that's needed using the NFS-root approach.