[Beowulf] AMD performance (was 500GB systems)

2013-01-10 Thread Bill Broadley
Over the last few months I've been hearing quite a few negative comments about AMD. Seems like most of them are extrapolating from desktop performance. Keep in mind that it's quite a stretch going from a desktop (single socket, 2 memory channels) to a server (dual socket, 4x the cores, 8 memory

Re: [Beowulf] single machine with 500 GB of RAM

2013-01-10 Thread Ellis H. Wilson III
On 01/10/13 00:04, Mark Hahn wrote: >> procs. Within each process the accesses to their "cube" of data were >> near to completely random. > > "completely random" is a bit like von Neumann's "state of sin" ;) > if they managed to make actually uniform random accesses, they'd have > discovered a new

Re: [Beowulf] single machine with 500 GB of RAM

2013-01-10 Thread Vincent Diepeveen
Hi, What budget do you have and how fast must latency be to the RAM? There will be a LOT of solutions to this. If you can get a box with way more dimm slots that's always the ideal solution - as smaller dimms are way cheaper a gigabyte than large dimms. Sometimes you can glue together 2 mothe