> On Tue, Sep 29, 2009 at 7:34 PM, Sascha Krissler <sascha.krissler <at> web.
> de> wrote:
> dividing the number of chains needed by the available resources gives
> you the time needed to finish the tables. so given 2000 chains/sec
> is the speed of all nodes reporting status, and 2^37 chains needed,
> that would be: 105 weeks. if we want to be done by xmas, we need
> 8 times as much power.
> a gtx260 (700mhz) with 216 cores gives
> 162 chains/sec peak, a 9600M-GT (500mhz) with 32 cores gives
> 20 chains peak. so you get around 0.00107 (gtx260) and 0.00125(9600)
> chains per (core * mhz * second). although the frequency is not
> really the core frequency,
> but since shader freq is usually linked to GPU freq, i got used to
> calculate with the
> GPU freq.
> more new text below.
> > i really didnt understand your answer . anyway according to table
> > structure can we divide the amount of chains needed to produce with
> > the amount of computing resource ( Cores , any other factor ? ) come
> > up with a parametric number ?
> > ---------- Forwarded message ----------
> > From: *Sascha Krissler*<sascha.krissler-S0/GAf8tV78@public.gmane.org
> > since the tables will be uploaded, there is no need to do this.
> it does not make sense to compute the tables for yourself, since they
> already be produced with the current network.
> > if you want to decrypt messages without the network, you will
> > want to use an FPGA with the proper size and you would need some
> > very fast SSDs. take a look at the TableStructure node in the trac
> > wiki
> with the network that is proposed, you distribute the precomputation
> and disk accesses across several nodes. if you wanted to do this all
> on your
> own, you would need much computing power and hardware that can do
> many IO Operations per unit of time. If you want to do all the
> yourself, you would need 380 fast gpus, which will need 38 kW of
> and you would have to do 2,5 million disk accesses which would take
> half an hour with one hard disk (assuming 1ms access time).
> > for some computation. if you used a hundred GPUs to do the
> > on
> > during the lookup, you would need a several kW power line.
> > if somebody wants to build all the tables in house how to compute
> > > needed resources and time ? i want to simplify things by having a
> > > formula around to put the amount of cores , frequency (
> > > overclocking is possible and this is also a variable ) and other
> > > factors all together . all ideas are appreciated
> > >
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