thanks , thats what i was looking for . so with a HP super computer > consist of : > SSD + i7 quad Core + 3* GTX 295 we will have nearly 1000 chains per > second and two of these computers equal all the computing resource > that we have on this project now ? am i correct ? after all , does
this is correct from the point of view of the network server, which only sees nodes that report status. > overclocking the GPUs help ? i have also another important question . you can get 20% increase from overclocking, at least with a single gtx260 in an open case, ensuring proper cooling. > assuming i have produced several chains is there anyway i can test > see with an imaginary known plain text there are chances to find it > in the limited produced chains ? how one can be sure the tables that > are being built are correct , other than following project's > instructions? you can download one of the a5/1 implementations that are not from our project and then generate some ciphertext. also read the reference implementation in svn://reference/a51.cpp to verify that the tables produce data to speed up a reverse function of A5/1. if you assume that the reference implementation is correct then you can verify the actual generated table as described here: http://reflextor.com/trac/a51/wiki/RunningTheProgram#Checkingvaluesagainstthereferenceimplementation > > bests > > On Tue, Sep 29, 2009 at 7:34 PM, Sascha Krissler <sascha.kriss...@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 > which > 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.kriss...@web.de> > > > > 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 > will > already be produced with the current network. > > > if you want to decrypt messages without the network, you will > probably > > 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 > time > 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 > precomputation > yourself, you would need 380 fast gpus, which will need 38 kW of > power. > 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 > precalculati > > 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 ( > considering > > > overclocking is possible and this is also a variable ) and other > > > factors all together . all ideas are appreciated > > > > > > > > _______________________________________________ A51 mailing list > A51@ > > lists.reflextor.comhttp://lists.lists.reflextor.com/cgi-bin/mailman/ > > > > listinfo/a51 > > ________________________________________________________________ > Neu: WEB.DE Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate > für nur 19,99 Euro/mtl.!* http://produkte.web.de/go/02/ > > > ________________________________________________________________ Neu: WEB.DE Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate für nur 19,99 Euro/mtl.!* http://produkte.web.de/go/02/ _______________________________________________ A51 mailing list A51@lists.reflextor.com http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
