M 11148593 has a [URL="http://www.mersenne.ca/exponent/11148593"]77 bit factor[/URL]

M 11198497 has a 74.4 bit factor


[Fri Oct 02 22:13:53 2015]
ECM found a factor in curve #1, stage #2
Sigma=4359337085573483, B1=50000, B2=5000000.
UID: nitro/haswell, M11198497 has a factor: 26388627524888833477391 (ECM curve 1, B1=50000, B2=5000000), AID: 64D2E3B7E51C9F533A7FC96A5DEB****

M 85009 has a 109.9 bit factor

ECM found a factor in curve #45, stage #1
Sigma=5722888173047275, B1=1000000, B2=1000000.
UID: nitro/haswell, M85009 has a factor: 1216257991344271446457970390032199 (ECM curve 45, B1=1000000, B2=1000000)

wow, a 110 bit factor? gratz

[QUOTE=Gordon;411901]M 85009 has a 109.9 bit factor

[/QUOTE]

Good shot! I´m also doing < 100 K exponents, but have been really unlucky as of late.
Just out of curiosity, how long does one curve take for assignments like the one above (B1=1e6, exponent ~ 85000)?
I´m doing 28K exponents with B1=3e6, which amounts to roughly the same amount of work per curve. It takes ~11min on an ageing i5-750 OCed to 3.2 GHz.

[QUOTE=lycorn;411928]Good shot! I´m also doing < 100 K exponents, but have been really unlucky as of late.
Just out of curiosity, how long does one curve take for assignments like the one above (B1=1e6, exponent ~ 85000)?
I´m doing 28K exponents with B1=3e6, which amounts to roughly the same amount of work per curve. It takes ~11min on an ageing i5-750 OCed to 3.2 GHz.[/QUOTE]

Haswell, 3.4GHz, no overclock. Does stage 1 in about 5 minutes.

I run a batch of 300 curves (stage 1 only) then copy that output file into a sub-folder. Start GMP-ECM running on that for the stage 2

Run another batch of 300 stage 1 curves, repeat process, and again.

Even running 3 copies of GMP-ECM at the same time, cpu utilisation stays below 40%. Memory usage is only about 3gb per instance and with 32 I have plenty to play with.

[QUOTE=Gordon;411964]Haswell, 3.4GHz, no overclock. Does stage 1 in about 5 minutes.

I run a batch of 300 curves (stage 1 only) then copy that output file into a sub-folder. Start GMP-ECM running on that for the stage 2

Run another batch of 300 stage 1 curves, repeat process, and again.

Even running 3 copies of GMP-ECM at the same time, cpu utilisation stays below 40%. Memory usage is only about 3gb per instance and with 32 I have plenty to play with.[/QUOTE]

What B2 are you using? Your factor-announcement post had B2 = B1, which makes no sense.

[QUOTE=VBCurtis;411968]What B2 are you using? Your factor-announcement post had B2 = B1, which makes no sense.[/QUOTE]

That was correct, it was found by Prime95 in the advanced,ecm mode. I am using P95 only for stage 1 using gmpecmhook. The resulting residues get passed to gmp-ecm...sometimes you get lucky.

Sometimes you don't - I am working through the exponents between 100k & 1 million taking them all from 62 to 64 bits, so far not a single factor in nearly 4000 tests.

M558521 down
 

It is not very easy to find factors bellow 1M, but possible. Recently I got lucky with this one:
M558521: [URL]http://www.mersenne.ca/exponent/558521[/URL]. 112 bits, ECM work.

[Sat Oct 3 19:54:32 2015]
ECM found a factor in curve #95, stage #2
Sigma=7665492458698752, B1=250000, B2=25000000.
UID: BloodIce/Mjolnir4, M558521 has a factor: 6217626694395075626755074825906289 (ECM curve 95, B1=250000, B2=25000000)

[QUOTE=Gordon;411969]That was correct, it was found by Prime95 in the advanced,ecm mode. I am using P95 only for stage 1 using gmpecmhook. The resulting residues get passed to gmp-ecm...sometimes you get lucky.

Sometimes you don't - I am working through the exponents between 100k & 1 million taking them all from 62 to 64 bits, so far not a single factor in nearly 4000 tests.[/QUOTE]

OK, so the factor was found in stage 1. When GMP-ECM does run stage 2, what B2 are you setting for the B1 = 1M runs?

[QUOTE=VBCurtis;411996]OK, so the factor was found in stage 1. When GMP-ECM does run stage 2, what B2 are you setting for the B1 = 1M runs?[/QUOTE]

If I let gmp-ecm pick it does about 975m, or I'll set it manually to 1b