Author: Jay Urbanski
Date: 23:17:12 08/08/03
Go up one level in this thread
On August 08, 2003 at 07:53:57, Vincent Diepeveen wrote: >On August 07, 2003 at 17:45:24, Jorge Pichard wrote: > >>http://www.cpuplanet.com/news/article.php/2242421 > >putting a sporthal full of dual xeon or dual opteron machines is not very >difficult for a government of course. Also very cheap. > >The question is how they connect the nodes to each other. That's the pricey part >of a supercomputer. Then they need to get to work 4 more things to call it a >supercomputer IMHO. Myrinet "D" adatpers for the Opteron portion, dual-rail Myrinet "E" adapters for the Itanium portino. >First of all OpenMP and MPI. Secondly an OS that without crashing runs at it >and i bet that default (experimental) NUMA linux kernel will go only to 64 >processors so i wonder how you can >call this worlds largest supercomputer anyhow if each accessible node is just 64 >cpu's which right now is the maximum linux can work with. Of course it supports OpenMP and MPI. As for an OS, it's standard Linux. The biggest SMP node is a 4-way for the Itaniums, all the Opterons are two-ways. You don't need esoteric kernels unless you are doing large SMPs, which this is not. Most "Supercomputers" are not NUMA systems, they are clusers of small SMP's. Take a look at #3 on the current TOP500 list. Nothing but dual processor Xeons runing Linux. >Third is they need a huge bandwidth and fast latency and in such a way that we >can work with more than 64 processors at a time. We can put in of course 100mbit >network cards and 2 routers or so then we have to work 32 cpu's. > >but suppose we want to run a job of 500 cpu's or something similar and we cannot >let each cpu communicate fast with the other cpu's. > >You still want to call that a supercomputer? It is by any definition of the word. But it will probably only be #4 or #5 by the time it's installed. >Now the only good thing we know is that the clusters of IBM usually are not so >bad. Thanks. :)
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