20041020, 02:00  #34 
Jun 2003
The Computer
2·191 Posts 
I was doing some 1061 to 44M and left B2 blank. Is there any way to make it more efficient?

20041020, 08:05  #35 
Banned
"Luigi"
Aug 2002
Team Italia
2^{5}·149 Posts 
Code:
[Fri Oct 15 11:38:32 2004] M1061 completed 1 ECM curves, B1=44000000, B2=4290000000 [Tue Oct 19 19:35:01 2004] M1061 completed 24 ECM curves, B1=44000000, B2=4290000000 
20041020, 16:53  #36 
Jun 2003
2·59 Posts 
[Wed Oct 20 10:01:20 2004]
M1061 completed 100 ECM curves, B1=44000000, B2=4290000000 Thomas 
20041020, 19:17  #37  
Mar 2003
New Zealand
13×89 Posts 
Quote:


20041020, 23:04  #38 
May 2003
2^{5}×3 Posts 
Hmm, I have three little questions.
I think I noticed somewhere that gmpecm is slower in stage 1 than Prime95, but gmpecm is waaaaay faster in stage 2. Is this correct ? Does the advantage of stage 2 make up for the loss in stage 1, in other words, is it better to use Prime95 or gmpecm. I suspect the answer to my second question is yes and gmpecm, so since I want to do some ECM on a windows computer, is there a distribution of ECM for Windows, or do I have to run it in cygwin and would it still be faster than Prime95 if I do run it in cygwin ? Ok, that last question may not be so little. Thanks, Axel Fox. 
20041021, 00:55  #39  
Mar 2003
New Zealand
13×89 Posts 
Quote:
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But you can have the best of both worlds: stage one with Prime95 and then continue stage two with gmpecm. To do this, add the line GmpEcmHook=1 to prime.ini and change the worktodo.ini entry so that stage two is not done, then when Prime95 has finished a batch of curves, run gmpecm as 'ecm resume results.txt 1 44e6180e9' to do the stage two step on each curve. Quote:


20041021, 11:15  #40  
Nov 2003
2^{6}·113 Posts 
Quote:
If you want to try, e.g. 10^226+1, you must use GMPECM. 

20041021, 11:21  #41 
May 2003
2^{5}×3 Posts 
Thanks for your reply geoff. After some tests it seems that my self compiled version was slightly slower on stage1 and slightly faster on stage2 than the link you gave me. (Slightly is a few seconds on a complete curve, so it didn't really make a difference).
I'm going to test the GmpEcmHook=1 thingy. BTW : what do I do if I have completed some curves, just post it here, or mail the results to george also ? And what do my B1 and B2 have to be to do some usefull curves ? 
20041021, 20:49  #42  
Mar 2003
New Zealand
13×89 Posts 
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If you use the default B2 for Prime95 (4.29 billion) or gmpecm (180 billion) then just report the curves as if you did them entirely on Prime95 or gmpecm respectively. Otherwise if you choose a nonstandard B2 you will need to calculate the conversion rate yourself. There is a program in this thread http://www.mersenneforum.org/showpos...05&postcount=6 to help with this. Of the two default B2 limits I would guess that the Prime95 one would be better suited to P4's and the gmpecm one to nonsse2 machines. I posted some timings earlier in this thread which suggested the best B2 was between about 10 billion and 20 billion for a P4 system. You might want to do your own timings for your setup, I would expect a larger B2 to be better on nonP4 machines. Also keep in mind that small adjustments to B2 have almost no effect on overall efficiency, so if in doubt just go with one of the defaults for simplicity. 

20041021, 23:36  #43 
Jun 2004
UK
139 Posts 
Code:
error404 4 thomasn 100 xyzzy 126 thomasn 100 ET 25 thomasn 100 marc 171 TOTAL 626 
20041022, 08:25  #44 
Jun 2003
2×59 Posts 
Please add
[Fri Oct 22 00:44:29 2004] M1061 completed 100 ECM curves, B1=44000000, B2=4290000000 to the above list ! Thomas 
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