At 02:54 23.09.2008, Perry E. Metzger wrote:
By the way, if you really can't afford for things to "go away" for 1/250th of a second very often, I have horrible news for you: NO COMPUTER WILL WORK FOR YOU.
Obviously a statement from someone not on the top of the subject. Here, a statement from someone who is. Snip from [http://domino.research.ibm.com/comm/research_projects.nsf/pages/osjitter.index.html]:
"Jones et al. [2] found that with only 0.31% daemon and OS activity on each CPU of a dedicated 4096 processor IBM SP system, MPI_Allreduce operation degraded more than 400%"
So Perry, some reading may be? Let me suggest The Case of the Missing Supercomputer Performance: Achieving Optimal Performance on the 8,192 Processors of ASCI Q, in ACM/IEEE Conference on Supercomputing (SC03), (Phoenix, Arizona, USA), Nov. 2003.
Then, you can comment on your own statement above written using caps locks ;-) Håkon _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
