Author: Uri Blass
Date: 01:48:01 04/14/02
Go up one level in this thread
On April 14, 2002 at 04:40:19, Slater Wold wrote: >On April 13, 2002 at 04:25:20, Bernhard Bauer wrote: > >>On April 12, 2002 at 18:33:16, Gian-Carlo Pascutto wrote: >> >>>On April 12, 2002 at 18:31:09, Gian-Carlo Pascutto wrote: >>> >>>>On April 12, 2002 at 18:07:26, bob o wrote: >>>> >>>>>2.I read somewhere that a 2 CPU machine would give an 80% increase in NPS. Does >>>>>this mean that there are diminishing returns with each extra CPU? >>>> >>>>Yes. >>>> >>>>What's even more worrying is that the latest public SMP Fritz >>>>(Deep Fritz) only had an increase of 30% with an extra CPU, >>>>not 80%. >>> >>>Little correction: what I was talking about wasn't pure NPS, since >>>that doesn't say anything in a parallel search, but the speedup. >>> >>>You can use a 1000-way system, get 1000 times the NPS and not go >>>a single precent faster. >>> >>>-- >>>GCP >> >>That's right. 8 CPU's give about 8-times the nps of a single CPU system. >>Bernhard > > >Hell no that isn't right. There is at LEAST a 30% penalty for SMP on an 8-way >box. 30% panelty is about speed and not anout np's. Uri
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