20050202, 03:31  #23 
Jan 2005
Transdniestr
503 Posts 
150 more for a total of 4700 at B1=11M

20050203, 08:12  #24  
Mar 2004
Belgium
5×13^{2} Posts 
Quote:
To be honest: I do not know this. I have put my concerns into the software section of the mersenneforum. I have also tried to read everything on ecm what I could find. I never found any complete tutorial, example. So please ignore my results... Best of luck with your factoring project. Regards Cedric Vonck 

20050203, 09:04  #25 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
5^{2}×17 Posts 
Normal output could (if you don't find any factors) look like:
Code:
GMPECM 5.0.3 [powered by GMP 4.1.4] [ECM] Input number is 2784908410762794071887414394815651793559267258537102016323316206 42982062389901741890579963524423782637435949041666525000702723914662388812510545 494307250950777886431051612811386531 (180 digits) Using B1=11000000, B2=25577181640, polynomial Dickson(12), sigma=1058443219 Step 1 took 338410ms Step 2 took 231680ms Run 2 out of 1000: Using B1=11000000, B2=25577181640, polynomial Dickson(12), sigma=762516686 Step 1 took 338160ms Step 2 took 233180ms Run 3 out of 1000: [] Run 999 out of 1000: Using B1=11000000, B2=25577181640, polynomial Dickson(12), sigma=252573442 Step 1 took 334870ms Step 2 took 230990ms Run 1000 out of 1000: Using B1=11000000, B2=25577181640, polynomial Dickson(12), sigma=2738065587 Step 1 took 334500ms Step 2 took 231170ms Code:
Step 2 took 85320ms ********** Factor found in step 2: 310280425886984887694911580049011296782214691 8598407 Found probable prime factor of 52 digits: 31028042588698488769491158004901129678 22146918598407 Composite cofactor 2115042966390179978303718113827180116042610311426696576586244 13023205204173795594453958188167116829523236801468161403289317068522085489 has 1 35 digits Last fiddled with by patrik on 20050203 at 09:05 
20050203, 09:22  #26 
Mar 2004
Belgium
1101001101_{2} Posts 
Never saw this before....
my batch file look like this: ecm5 11e6 25577181640 c 100 save save.txt resume resume.txt < factor.txt factor.txt contains the factor. I stripped the CR (carriage return) Nothing more nothing less. 
20050203, 11:12  #27 
"Nancy"
Aug 2002
Alexandria
2,467 Posts 
Command line options such as c, save etc must be placed before the B1, B2 values. Gmpecm stops parsing the command line after B2. The options save and resume have no meaning for what you're trying to do anyways, you can use them to do part of stage 1 now and the rest later, or import stage 1 residues from other programs. Since you want to do complete curves in one go, you don't really want saving or resuming of residues.
Alex 
20050203, 12:47  #28  
Mar 2004
Belgium
34D_{16} Posts 
Quote:
ecm5 c 100 11e6 25577181640 < factor.txt ????? 

20050203, 13:13  #29  
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
110101001_{2} Posts 
Quote:
ecm5 c 100 11e6 < factor.txt > out.txt I don't know how the c option works when you find a factor. Does it stop then? Otherwise your found factor could scroll above the top of the window if you don't send the output to a file. (Earlier I have only used gmpecm on numbers of the form 2^n1, where Prime95 is faster for step 1, and then I don't have to use c when I run step 2 using gmpecm. That is an example of a case when resume is used.) 

20050203, 14:21  #30  
"Nancy"
Aug 2002
Alexandria
2,467 Posts 
Quote:
Alex 

20050203, 20:28  #31 
Mar 2004
Belgium
5·13^{2} Posts 
Will try....
Sorry guys, problem remains. I leaving this "factoring" project..... Good results... Last fiddled with by ValerieVonck on 20050203 at 20:39 
20050207, 18:26  #32 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
5^{2}·17 Posts 
800 curves with B1=43e6, default B2 (=178426462988).
I have one more idea that might explain how ecm behaved for CedricVonck, and that is if LF or CR LF is missing completely in factor.txt. (Both these two works for me.) I.e. if the size is 180 bytes it won't work. The size should be 181 or 182 bytes for this 180 digit factor. Windows notepad works a bit different regarding this compared to e.g. the UNIX program vi. In notepad, if you type a line without hitting return in the end, no CR LF will be appended, but in vi you get a LF. If you do hit return and the end of a notepad line you will get CR LF, while in vi you then would get two lines (terminated with LF). Last fiddled with by patrik on 20050207 at 18:28 
20050207, 19:56  #33 
Jul 2004
Potsdam, Germany
1477_{8} Posts 
I also had some hard time figuring it out. Here is comes:
command line: ecm5 c 100 43e6 < factor.txt factor.txt has to contain the factor, followed by a \n Then, you have to start a new line (inside the file). Now it works for me... Last fiddled with by Mystwalker on 20050207 at 20:04 
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