On Wed, 14 Apr 2010 19:07:10 -0300, Pedro Torres <torres.pedrozpk at gmail.com> wrote: > This may be a dummy question but in the second bullet says "its own memory > bandwith of roughly 2 or more gigabytes", this means gigabytes/seconds
Yes, but this is a bit dated and very architecture dependent. For example, relative to current AMD/Intel offerings, BlueGene has much slower cores and slightly slower memory, leading to (usually) better scalability. In addition to the factors of in-socket scalability, it can be faster (if your network and MPI support it) for the network hardware to perform the copies in send/recieve operations on the same node (i.e. even when you have shared memory, the copies are often better done by network hardware than by the kernel). Arguably the only meaningful scalability study is by choosing how to utilize each node and then increasing the number of nodes. Jed
