found ECM factors are shown multiple times

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Marty
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found ECM factors are shown multiple times

#1 Ungelesener Beitrag von Marty » 26.05.2011 01:36

When i follow the link for "ecm factors found" from my account page (user-id 5121) i see 2 entries for the same factor (see below) each with a different timestamp. This seems to have started sometime around October of last year. It doesn't look right to me.

ECM factors found:
Date User Project Value Factor digits
2011-03-30 17:56:38 Marty XYYXF 14051+51140 (B1 = 11000000) 436745839326286504894569852867454691 36
2011-03-30 17:43:49 Marty XYYXF 14051+51140 (B1 = 11000000) 436745839326286504894569852867454691 36
2011-03-29 09:58:26 Marty XYYXF 14843+43148 (B1 = 11000000) 606717655346660538041476652464993199 36
2011-03-29 09:58:16 Marty XYYXF 14843+43148 (B1 = 11000000) 606717655346660538041476652464993199 36
2011-03-29 09:58:15 Marty XYYXF 14843+43148 (B1 = 11000000) 294888879410412762295202520606023334409 39
2011-03-29 09:58:08 Marty XYYXF 14843+43148 (B1 = 11000000) 294888879410412762295202520606023334409 39
2010-10-21 16:00:42 Marty XYYXF 14852+52148 (B1 = 11000000) 41917918668590356341257273624971841 35
2010-10-21 15:44:10 Marty XYYXF 14852+52148 (B1 = 11000000) 41917918668590356341257273624971841 35
2010-03-07 07:53:56 Marty NearRepdigit 11113_184 (B1 = 11000000) 4148400006483399883957442569065648756923044189 46
2009-06-30 06:31:38 Marty OddPerfect 12547_41M.C119 (B1 = 43000000) 32110615487026968795981131332248378788746471603 47

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yoyo
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Re: found ECM factors are shown multiple times

#2 Ungelesener Beitrag von yoyo » 26.05.2011 05:22

This is right and happens sometimes.
ECM is a trial factoring method. So for a given number we run 1000 or 2000 or more trials. If one trial returns a factor the remaining trials are aborted. Means not yet send wus are aborted and clients are informed on ther next contact to abort not yet started trials.
But if the client has already started a wu or if the client doesn't contact the server the wu isn't aborted and might find the factor again.
yoyo
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