Messages in this thread | | | Date | Wed, 3 Sep 2003 18:01:33 +0200 | From | Jörn Engel <> | Subject | Re: Scaling noise |
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On Wed, 3 September 2003 08:10:33 -0700, Martin J. Bligh wrote: > > > multi node yes, numa not much and where numa-like systems are being used > > they are being used for message passing not as a fake big pc. > > > > Numa is valuable because > > - It makes some things go faster without having to rewrite them > > - It lets you partition a large box into several effective small ones > > cutting maintenance > > - It lets you partition a large box into several effective small ones > > so you can avoid buying two software licenses for expensive toys > > > > if you actually care enough about performance to write the code to do > > the job then its value is rather questionable. There are exceptions as > > with anything else. > > The real core use of NUMA is to run one really big app on one machine, > where it's hard to split it across a cluster. You just can't build an > SMP box big enough for some of these things.
This "hard to split" is usually caused by memory use instead of cpu use, right?
I don't see a big problem scaling number crunchers over a cluster, but a process with a working set >64GB cannot be split between 4GB machines easily.
Jörn
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