big job planning - Page 2

Andi47 · 2010-08-06, 21:24

Quote:

Originally Posted by frmky

... when an average member of the public can go out, spend $50K on computers...

lol

I don't know any average member of the public, who has got $50k to spend on computers...

frmky · 2010-08-06, 21:34

Quote:

Originally Posted by Andi47

I don't know any average member of the public, who has got $50k to spend on computers...

Ok ... a really motivated average member of the public, or 50 motivated average members of the public.

R.D. Silverman · 2010-08-06, 22:01

Quote:

Originally Posted by frmky

It's not presumptuous, it's simply a fact. While excellent lattice sieving code has been released, and for which we are very appreciative, the postprocessing code has not. Jason has spent an enormous amount of time creating and releasing wonderful postprocessing code, and I believe his achievement should be highlighted. In addition, there is a huge difference, and therefore a new "benchmark," when an average member of the public can go out, spend $50K on computers, download the software from the internet, and do these factorizations on his own in reasonable time.

I do plan to work up to a kilobit, but in small steps. Start with 286, then 290, then 295...

ONLY $50K? What is the cost of the parallel computer
(and its Infiniband interconnect) used to solve the matrix?
How many PC's are involved in the sieving??

frmky · 2010-08-06, 22:33

Quote:

Originally Posted by R.D. Silverman

ONLY $50K? What is the cost of the parallel computer
(and its Infiniband interconnect) used to solve the matrix?
How many PC's are involved in the sieving??

Sure. You can build diskless, headless nodes with Core i7's and SDR Infiniband for under $1000/node. Let's say you get 50. (This leaves a few hundred for electricity.) That's 200 cores. Based on NFS@Home sieving times, that cluster could do an SNFS 275 from start to finish in under 3 weeks. Scale up appropriately for larger numbers.

jasonp · 2010-08-07, 00:37

Thanks Greg, an appreciative user community has made it easy to keep going. Out of curiosity, what does a small infiniband switch cost? Some of the offerings here I actually don't want to know about :)

Edit: Let's go shopping!

frmky · 2010-08-07, 05:08

The state-of-the-art stuff is really expensive, but if you want to do IB on the cheap, then here's your adapter (one for each node), 8 or 24 port switch, depending on the size of your cluster, and of course cables. For a small 8-node cluster, that works out to be about $260 per node plus tax & shipping.

2010-08-07, 00:37	#16
jasonp Tribal Bullet Oct 2004 3×1,181 Posts	Thanks Greg, an appreciative user community has made it easy to keep going. Out of curiosity, what does a small infiniband switch cost? Some of the offerings here I actually don't want to know about :) Edit: Let's go shopping! Last fiddled with by jasonp on 2010-08-07 at 02:53

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2010-08-07, 05:08	#17
frmky Jul 2003 So Cal 2,111 Posts	The state-of-the-art stuff is really expensive, but if you want to do IB on the cheap, then here's your adapter (one for each node), 8 or 24 port switch, depending on the size of your cluster, and of course cables. For a small 8-node cluster, that works out to be about $260 per node plus tax & shipping.