mersenneforum.org P-1 factoring anyone?
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2012-05-15, 02:37   #1299
Dubslow

"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88

722110 Posts

Quote:
 Originally Posted by PageFault There is another observation. M57078733 just started its run and (as normal) the client prints "Using Pentium4 Type-0 FFT length 3M, Pass1=768, Pass2=4K". For the M83xxxxx it used a Core2 FFT (details were not recorded). Of course, if a particular code path is faster, the client should check and use the best one. I'm wondering if anyone else has seen this behavior.
Whenever he writes new FFTs, George times all code paths on all architectures, and chooses the fastest one regardless of what the name of the FFT is. If at low expos Core2 FFTs are chosen, that means they are faster than the Pentium4 FFTs, even on a PentiumD (which is, as I recall, what you are using).

2012-05-17, 15:48   #1300
harlee

Sep 2006
Odenton, MD, USA

22·41 Posts

Quote:
 Originally Posted by James Heinrich Found one more (bold), but this time in another range: M6,802,123, M6,853,937, M6,853,967, M6,854,297, M6,888,719, M6,935,129, M6,937,501, M8,855,257
Found another one for your list: 9,914,951

2012-05-17, 16:21   #1301
James Heinrich

"James Heinrich"
May 2004
ex-Northern Ontario

3,361 Posts

Quote:
 Originally Posted by harlee Found another one for your list: 9,914,951
There's now a proper list on the site: http://mersenne-aries.sili.net/p1missed.php

2012-05-17, 16:50   #1302
bcp19

Oct 2011

7×97 Posts

Quote:
 Originally Posted by harlee Found another one for your list: 9,914,951

2012-05-18, 11:39   #1303
Bdot

Nov 2010
Germany

3×199 Posts

Quote:
 Originally Posted by James Heinrich There's now a proper list on the site: http://mersenne-aries.sili.net/p1missed.php
This list show quite a lot of NF-PM1 entries, also from the recent past. For example:
http://mersenne-aries.sili.net/expon...etails=1043639
http://mersenne-aries.sili.net/expon...etails=2000807
http://mersenne-aries.sili.net/exponent.php?factordetails=18455
http://mersenne-aries.sili.net/exponent.php?factordetails=445651137737144960137768908774222013799
http://mersenne-aries.sili.net/expon...=7411839124463

Is there a problem in prime95 finding some of the factors if some special conditions occur (which?)?

On the other hand, James, could you also scan your factor repository for factors found by P-1 that should have been found by TF, but have been reported NF? If there are any, this could be used to reveal corner-case problems in mfakto/mfaktc.

2012-05-18, 13:00   #1304
James Heinrich

"James Heinrich"
May 2004
ex-Northern Ontario

3,361 Posts

Quote:
 Originally Posted by Bdot This list show quite a lot of NF-PM1 entries, also from the recent past. Is there a problem in prime95 finding some of the factors if some special conditions occur (which?)?
The only "problem" in this case is that the factors were already known, and put into the "known factors" list of the Pminus1= worktodo line so that Prime95 won't break out after re-finding these known factors in stage1, but continue to run to the bounds you set. Not something that most users will ever do or know about, but a few people have fun playing around with such things.

I have adjusted the logic generating that page to exclude any factor that was already known before the P-1 test was run, and it works better now.

2012-05-18, 13:32   #1305
Bdot

Nov 2010
Germany

11258 Posts

Quote:
 Originally Posted by James Heinrich The only "problem" in this case is that the factors were already known, and put into the "known factors" list of the Pminus1= worktodo line so that Prime95 won't break out after re-finding these known factors in stage1, but continue to run to the bounds you set. Not something that most users will ever do or know about, but a few people have fun playing around with such things. I have adjusted the logic generating that page to exclude any factor that was already known before the P-1 test was run, and it works better now.
Thanks, this also cut the list in half ...

2012-05-18, 18:05   #1306

"Richard B. Woods"
Aug 2002
Wisconsin USA

22·3·641 Posts

Quote:
 Originally Posted by harlee Found another one for your list: 9,914,951
Quote:

Last fiddled with by cheesehead on 2012-05-18 at 18:07

 2012-05-20, 02:22 #1307 PageFault     Aug 2002 Dawn of the Dead 5×47 Posts Another one nailed in Stage 1: Code: [Sat May 19 17:23:16 2012] P-1 found a factor in stage #1, B1=610000. UID: PageFault/boxen_01, M57111113 has a factor: 46695916625813440426631, AID: I had a feeling this one had a factor ... brainfart maybe, or too much whisky ... all those 111's ... Lets see about a range I grabbed by manual means around M70000000. Much slower, but I got tight groups of nearby exponents. I like those, in the past I used to game on blocks of factor rich exponents ... let's see what I find.
 2012-05-28, 02:42 #1308 S34960zz   Feb 2011 22·13 Posts can't get P-1 work in 45.xxx.xxx to 51.xxx.xxx range? Any particular reason why P-1 manual assignments in the 45.xxx.xxx to 51.xxx.xxx range are not available? Without specifying an exponent range, I got P-1 assignments between 52.9xx.xxx and 56.2xx.xxx (two sets of 5 assignments). When exponent range 44.000.000 to 45.999.999 specified, I got response "No large Mersenne P-1 factoring assignments found." and double-check assignments (another 5 assignments). There would seem to be plenty of assignments in the requested range (scroll right to "Available"). Code: PrimeNet Activity Summary 2012-05-28 02:00 UTC ----------=-----=-- | -----=-----=-----=-----=----- | -----=-----=-----=----- | -----=-----=-----=----- | Exponent Range | Composite | Status Unproven | Assigned | Available | Start Count P | F LL-D | LL LLERR NO-LL | TF P-1 LL LL-D | TF P-1 LL LL-D | ----------=-----=-- | -----=-----=-----=-----=----- | -----=-----=-----=----- | -----=-----=-----=----- | 40000000 57102 | 35705 470 20922 5 | 44 4 | 20879 | 41000000 56864 | 35539 348 20970 7 | 66 | 20911 | 42000000 56915 1 | 35693 314 20889 2 16 | 62 4 | 20841 | 43000000 56849 1 | 35507 338 20959 1 43 | 1 1 80 26 | 20895 | 44000000 56776 | 35867 308 20422 4 175 | 10 326 220 38 | 20010 | 45000000 56893 | 35795 236 20083 43 736 | 561 818 2 | 915 18569 | 46000000 56640 | 35537 229 19732 48 1094 | 1 1153 32 | 1057 18623 | 47000000 56451 | 35528 162 19217 49 1495 | 1 1564 1 | 1290 17905 | 48000000 56387 | 35473 212 18161 119 2422 | 11 2563 4 | 1930 16198 | 49000000 56603 | 35800 713 16482 264 3344 | 8 3597 2 | 514 30 15938 | 50000000 56360 | 35758 94 16241 83 4184 | 31 1 4207 6 | 82 47 16136 | 51000000 56349 | 36142 62 12932 107 7106 | 14 3 7147 | 7 63 12916 | 52000000 56209 | 35844 28 11605 77 8655 | 125 50 8392 | 27 181 11569 | 53000000 56151 | 35996 29 8175 84 11867 | 97 2 11693 | 4 195 8168 | 54000000 55997 | 35800 12 6320 54 13811 | 3464 159 9937 | 89 321 6227 | 55000000 56130 | 35636 7 4561 24 15902 | 6327 501 9108 | 81 27 4475 | 56000000 56105 | 35338 6 4290 34 16437 | 5301 651 10433 | 108 82 4192 | 57000000 55901 | 35138 1 2174 19 18569 | 7286 421 10918 | 1 49 16 2082 | 58000000 55978 | 34898 3 1386 55 19636 | 7457 357 11708 | 277 33 1277 | 59000000 55801 | 34552 136 1 21112 | 4241 55 2298 | 14400 134 135 |
2012-05-28, 02:53   #1309
Prime95
P90 years forever!

Aug 2002
Yeehaw, FL

22·1,873 Posts

Quote:
 Originally Posted by S34960zz There would seem to be plenty of assignments in the requested range
I think those P-1 assignments are only needed for double-checking. The server currently hands out P-1 assignments for exponents needing a first-time LL test.