Team sieve #22: c166 from 3270:620
 

Sequence 3270 is the shortest sequence with a start below 10000, having grown with a long period of 2^3*3*5; it's now at 2^3*3*7.

Iteration 620 is a C166: I spent about eight CPU-weeks finding the polynomial. We'd need to sieve from 15M to 60M using the 15e siever with this poly:
[code]
n: 1773271754188764469178068334154046464444957274952289279955825326222321328349114330973185907243392930104294678498232714048124362163786378662540085144893974571128845721
skew: 50908204.88
Y0: -144767682063889933793321068524324
Y1: 538109518954680569
c0: 2825944577227672043009611776143415421051145
c1: -96204614071321310022916080146763798
c2: -975710455700385174343979023
c3: 1385331590129139306600
c4: -3062765784988
c5: 27888
lpbr: 30
lpba: 30
mfbr: 60
mfba: 87
rlambda: 2.6
alambda: 3.6
alim: 40000000
rlim: 40000000
[/code]
Sieve from Q=15 million to Q=60 million, with the 15e siever. Anyone interested?

[B]Reservations:[/B][code]
15.0M- 15.5M Andi47 (done, 1680529)
15.5M- 16.0M richs (15.5-15.9 done)
16.0M- 16.5M Andi47 (done, 1672600)
16.5M- 24.0M FactorEyes (done, 24963783 relations)
24.0M- 24.5M Andi47 (done)
25.0M- 30.0M fivemack (done, 16211446 relations)
30.0M- 32.0M fivemack (done, 6366426 relations)
32.0M- 40.0M FactorEyes (done, 24922498 relations)
40.0M- 41.0M schickel (40.0-40.5 done)
41.0M- 46.0M bsquared (done, 14847229 relations)
46.0M- 50.0M bsquared (done, 11517802 relations)
50.0M- 54.0M bsquared (done, 11130575 relations)
54.0M- 56.0M bsquared (done, 5461598 relations)
[/code]

Post-processing will be done by [B]fivemack[/B]

Upload relations via FTP to [url]ftp://ssh.fivemack.org[/url] and put them in the 3270.620 directory.

Relations so far: about 102 million. At least 75% done.

[b]As of 29 Jan 2011: please, no more large reservations.[/b]
[B]2 Feb 2011: Post-processing has begun.[/B]

reserving 15M-15.5M

Edit2: I guess the -M 1 flag would be useful for this job too?

[QUOTE=fivemack;243460]Sequence 3270 is the shortest sequence with a start below 10000, having grown with a long period of 2^3*3*5; it's now at 2^3*3*7.

Iteration 620 is a C166: I spent about eight CPU-weeks finding the polynomial.[/quote]I assume you feel enough ECM has been run?

And, yes, we have been talking about more joint forum projects, so maybe this could be the first one....

[SIZE="1"]Actually, it looks like it's 2^5 * 3 * 7, which isn't any better than 2^3 * 3 * 5....[/SIZE]

details I left out
 

ECM: I've done 4000 @ 3e7 and 10000 @ 1e7 - two weekends on 16 threads on the Mac Pro at the office. If anyone wants to run a bit more they're welcome.

ftp directory is [b]3270.620[/b] on ssh.fivemack.org

-M 1 is indeed useful for this job

I will do the post-processing

[QUOTE=schickel;243466]I assume you feel enough ECM has been run?[/QUOTE]

[QUOTE=fivemack;243468]ECM: I've done 4000 @ 3e7 and 10000 @ 1e7 - two weekends on 16 threads on the Mac Pro at the office. If anyone wants to run a bit more they're welcome.

[/QUOTE]:blush: I wish I had that kind of ECM power!

I think this thread needs to become sticky'd.

15e siever and short range of q values, so RSALS can't lend a hand in this team sieving :no:

I thought I'd try to lend some effort, but my machines are either too limited or I'm doing something wrong. I get the following with the above poly:
[code]
$ gnfs-lasieve4I15e -a 3270:620.poly -o 3270:620.rels -f 15500000 -c 500000
Warning: lowering FB_bound to 15499999.
Segmentation fault
$
[/code]Same result on two Ubuntu machines. Is 512Mb possibly insufficient?

[QUOTE=EdH;243503]I thought I'd try to lend some effort, but my machines are either too limited or I'm doing something wrong. I get the following with the above poly:
[code]
$ gnfs-lasieve4I15e -a 3270:620.poly -o 3270:620.rels -f 15500000 -c 500000
Warning: lowering FB_bound to 15499999.
Segmentation fault
$
[/code]Same result on two Ubuntu machines. Is 512Mb possibly insufficient?[/QUOTE]

on my ubuntu machine it takes ~223 MB.

feeling a bit lonely here.

At the current rate (I'm sieving ~80 kQ/day) we will be ready around summer 2012...

[QUOTE=Andi47;244101]feeling a bit lonely here.

At the current rate (I'm sieving ~80 kQ/day) we will be ready around summer 2012...[/QUOTE]I know how you feel. I'm still working on my c155. After that finishes, I can lend some cycles.

I'm also hoping that the New Year brings some nice deals on quad-cores!