[Beowulf] Mutiple IB networks in one cluster
lindahl at pbm.com
Wed Feb 5 23:49:13 PST 2014
In the usual Clos network, 1/2 of the nodes can make a single call to
the other 1/2 of the nodes. That's what's non-blocking. Nothing else
is. Running any real code, every node talks to more than one other
node, and the network is not non-blocking.
It makes perfect sense in a telephone network. In the real world, a
Clos network is good but not non-blocking.
On Wed, Feb 05, 2014 at 06:31:11PM -0600, Alan Louis Scheinine wrote:
> Clos is non-blocking up to a certain number of completed connections.
> The number of nonblocking connections is typically much less than
> the number of nodes for which the Clos network provides service.
> Anybody can make a telephone call to anybody else, up until the
> maximum number of completed connections is reached.
>> At least that is what Chuck Seitz drove into our heads whenever we said that a Clos was non-blocking. :-)
> Alan Scheinine
> 200 Georgann Dr., Apt. E6
> Vicksburg, MS 39180
> Email: alscheinine at tuffmail.us
> Mobile phone: 225 288 4176
> Beowulf mailing list, Beowulf at beowulf.org sponsored by Penguin Computing
> To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
More information about the Beowulf