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Old 2021-05-23, 18:48   #1
sega24
 
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Default HPC with factoring ?

Hi
Can we use HPC for factroring ?
For example if i want to split 3 motherboards to factoring rsa512 with win server or azure. Is this will work ? with gnfs.

Last fiddled with by Dr Sardonicus on 2021-05-24 at 12:13 Reason: Fix typo in title
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Old 2021-05-24, 01:55   #2
VBCurtis
 
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I'm not sure you mean "HPC" the way other people use it. Do you mean a cluster of workstation-grade processors with high-speed interconnect? Or just a bunch of PCs working together over ethernet?

What exactly do you have in mind?

If you're willing to do a little bit of work with either setup files in factmsieve or server/client settings with CADO, you can use as many machines as you like for poly select and sieving, but it's hard to profitably use more than one for matrix-solving unless you have infiniband.
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Old 2021-05-24, 06:17   #3
retina
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https://en.wikipedia.org/wiki/Windows_HPC_Server_2008

It's been around for 13 years now.

I've never personally seen one in use. It would be interesting to see how it works for RSA512.
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Old 2021-05-24, 20:55   #4
sega24
 
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cmn
last package is from 2019 year
https://docs.microsoft.com/pl-pl/pow...?view=hpc19-ps
its works with win10 win7 etc
but i wonder one thing, for example i have 2 pc's with i9 10980xe, conecting by lan even with GBit switch, isnt its to slow ?
HDD - m.2 nvme

but if noone test that connection, hard to say about the speed.
i think i will be the first who will test it


thx guys
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Old 2021-05-24, 22:25   #5
VBCurtis
 
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Again, you're not being specific enough. Too slow to do what, exactly?
If you just want to use both machines to sieve a single GNFS job together, that's trivial- you can use any number of machines with any latency, since the individual sieve jobs are totally independent. CADO has implemented a nice server/client setup to do so, and we've done this many times across the internet.

The "no, it's too slow" is only for the matrix-solving phase, but that doesn't take very long so you shouldn't worry that you can't use two machines for that step. CADO does allow MPI to be used to split part of the matrix-solving job over two machines, but it's not dead-simple to use.
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Old 2021-05-27, 13:16   #6
LaurV
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He talks about RSA512 numbers, which are just a ~C155. This is a few days job for a SINGLE i9-10980xe (18 cores, 8 memory channels, this is a beast, I am just writing this post from one), without any inter-connection.
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