Fourteen or Bust, or ECM attack on C300+ - Page 2

wombatman · 2014-10-23, 18:22

That makes sense. I'm doing 8 curves at B1=110M (simultaneous with ecm.py) approximately every 20 minutes, so a quick calculation says it would take me about a month to run 18,000 curves.

Batalov · 2014-10-23, 22:40

Upon a second thought, you may want to switch to B1=260M curves, they will take ~50 minutes each.
This is because while your chances of getting a <t55 factor are not zero, but significantly decreased by the bayesian prior of knowing that 6000 (and some in progress) are run at B1=260M level without a factor. With 3000 more of my curves finishing, your chances will go down by the factor of 1/e (because the 3000 will complete the t55 level, and the chances of a factor will become ~ e^-1 of the initial chances.

One thing that you would want to do is stagger the curves so the 2nd stage memory is used by 1-2 threads of the 8. Phase the curves to start at, say, two at the top of the hour, two more at :12, two more at :24 and two more at :36 and then leave them be.

swellman · 2014-10-24, 01:33

Quote:

Originally Posted by swellman

ryanp is reserving C300_141_133.

Just an update - Ryan has run this through a gauntlet of ECM. Probably some bursts of high levels but no factors found.

At this point, he has documented 5000 curves @B1=260M with more to come.

Sean

wombatman · 2014-10-24, 14:01

Quote:

Originally Posted by Batalov

Upon a second thought, you may want to switch to B1=260M curves, they will take ~50 minutes each.
This is because while your chances of getting a <t55 factor are not zero, but significantly decreased by the bayesian prior of knowing that 6000 (and some in progress) are run at B1=260M level without a factor. With 3000 more of my curves finishing, your chances will go down by the factor of 1/e (because the 3000 will complete the t55 level, and the chances of a factor will become ~ e^-1 of the initial chances.

One thing that you would want to do is stagger the curves so the 2nd stage memory is used by 1-2 threads of the 8. Phase the curves to start at, say, two at the top of the hour, two more at :12, two more at :24 and two more at :36 and then leave them be.

I'll give that a shot. Thanks!

Batalov · 2014-10-24, 16:23

I ran 20,000 B1=260M curves on C301_148_131 altogether and stopped.

Batalov · 2014-10-24, 16:42

Checked the Fourteen in the factordb.com ... so far it looks like a Bust. :-(

WraithX · 2014-11-06, 04:50

Quote:

Originally Posted by Batalov

I ran 20,000 B1=260M curves on C301_148_131 altogether and stopped.

So, did you run 20,000 B1=260M curves in a day or two? If so, that's truly impressive! Do you have access to lots of computers (or just processors) at a University, or something similar? I'm currently working on a C251 and have done about 26,400 B1=260M curves in 20 days. This is with 32 cores on 3 different machines (16+12+4, not all equal). I certainly wouldn't mind seeing my curve count speed up by about 20x. Which makes me wonder, did you use about 500-600 cores to run that many curves that fast?

VictordeHolland · 2014-11-06, 10:09

Quote:

Originally Posted by WraithX

So, did you run 20,000 B1=260M curves in a day or two? If so, that's truly impressive! Do you have access to lots of computers (or just processors) at a University, or something similar? I'm currently working on a C251 and have done about 26,400 B1=260M curves in 20 days. This is with 32 cores on 3 different machines (16+12+4, not all equal). I certainly wouldn't mind seeing my curve count speed up by about 20x. Which makes me wonder, did you use about 500-600 cores to run that many curves that fast?

Batalov has some serious firepower, I don't know how much exactly, but he can do a SNFS(diff 176) in half a day .

swellman · 2014-11-18, 18:37

Quote:

Originally Posted by swellman

As all of my ECM reservations are about to finish, I'd like to take C301_143_129 to t55. It will take a few weeks.

C301_143_129 survived 18000+ curves @B1=110M with no factors found. Releasing number.

XYYXF · 2015-06-21, 21:47

yoyo@home performed 9k@850M on all of them. Still no factors.

http://www.primefan.ru/xyyxf/status.html#work

XYYXF · 2016-11-03, 23:42

Could Ryan help with B1=850M on the remaining numbers?
C301_143_129
C300_145_136
C301_148_131
C302_149_110
C303_150_119

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2014-10-23, 18:22	#12
wombatman I moo ablest echo power! May 2013 29·61 Posts	That makes sense. I'm doing 8 curves at B1=110M (simultaneous with ecm.py) approximately every 20 minutes, so a quick calculation says it would take me about a month to run 18,000 curves.

2014-10-23, 22:40	#13
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 2505₁₆ Posts	Upon a second thought, you may want to switch to B1=260M curves, they will take ~50 minutes each. This is because while your chances of getting a <t55 factor are not zero, but significantly decreased by the bayesian prior of knowing that 6000 (and some in progress) are run at B1=260M level without a factor. With 3000 more of my curves finishing, your chances will go down by the factor of 1/e (because the 3000 will complete the t55 level, and the chances of a factor will become ~ e^-1 of the initial chances. One thing that you would want to do is stagger the curves so the 2nd stage memory is used by 1-2 threads of the 8. Phase the curves to start at, say, two at the top of the hour, two more at :12, two more at :24 and two more at :36 and then leave them be.

2014-10-24, 16:23	#16
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 3⁶×13 Posts	I ran 20,000 B1=260M curves on C301_148_131 altogether and stopped.

2014-10-24, 16:42	#17
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 3⁶·13 Posts	Checked the Fourteen in the factordb.com ... so far it looks like a Bust. :-(

2015-06-21, 21:47	#21
XYYXF Jan 2005 Minsk, Belarus 2⁴×5² Posts	yoyo@home performed 9k@850M on all of them. Still no factors. http://www.primefan.ru/xyyxf/status.html#work

2016-11-03, 23:42	#22
XYYXF Jan 2005 Minsk, Belarus 400₁₀ Posts	Could Ryan help with B1=850M on the remaining numbers? C301_143_129 C300_145_136 C301_148_131 C302_149_110 C303_150_119