Team sieve #33: c147 from 4788:i2902

[jrk]

Feb 6: Post-processing has begun! ETA: Feb 6
Feb 6: Post-processing complete

# sieve with ggnfs lasieve4 I14e on alg side from Q=7M to 26M
# aq4788:2902
n: 519477233458809944274462307769789622171656483385514941102549625162939672508851026254735720296563793696672725531438122619257908020453079546743088081
# norm 3.372592e-14 alpha -7.068844 e 8.729e-12 rroots 3
skew: 1665582.85
c0: -953139681083704760050089658234976027
c1:  1464692957284274645788586940108
c2: -29605332992848501471703
c3: -1379437007976712506
c4:  286328143276
c5:  290472
Y0: -17802967967747404322555995440
Y1:  7977258362523757
rlim: 14000000
alim: 14000000
lpbr: 28
lpba: 28
mfbr: 56
mfba: 56
rlambda: 2.5
alambda: 2.5

Reservations:

   6- 7M   Mini-Geek (done, 1662129 relations)
   7- 8M   EdH (done, ~1.65M relations)
   8-10M   EdH (done)
  10-12M   EdH (done)
  12-14M   EdH (done)
  14-20M   EdH (done)
  20-24M   Mini-Geek (done, 5636606 relations)
  24-25M   Mini-Geek (done, 1337697 relations)
  25-26M   Mini-Geek (done, 1323433 relations)

Total relations: 31169535

[EdH]

Taking 10M-12M for my next nibble...

[EdH]

12M-14M

[EdH]

More nibbling: 14M-20M

[Mini-Geek]

Reserving 20M-24M.

[Mini-Geek]

I'll do the post-processing, unless EdH would prefer to, or someone would like to offer a better machine than 4 cores of i5-750@2.8 GHz. I recently upgraded to 8 GB of memory and a 64-bit OS, so I can handle something like this now.

[EdH]

Originally Posted by Mini-Geek

I'll do the post-processing, unless EdH would prefer to, or someone would like to offer a better machine than 4 cores of i5-750@2.8 GHz. I recently upgraded to 8 GB of memory and a 64-bit OS, so I can handle something like this now.

You may have it. My machines are a bit weak. I might even need to give back some of my latest range. I just lost about half a day of sieving on a lot of cores due to a power outage and no checkpoints, "since I was only doing 100k" on most of them.

If someone wants some or all of 16M-20M, let me know. I'll plod along unless or until...

[Mini-Geek]

Originally Posted by EdH

My machines are a bit weak. I might even need to give back some of my latest range. I just lost about half a day of sieving on a lot of cores due to a power outage and no checkpoints, "since I was only doing 100k" on most of them.

Sorry to hear that.
It's been a while since I've done NFS sieving...I thought that the output file doubled as a checkpoint, since the lasieve program run with -R for resume can read that and see where it left off? Is there an option or something to create a checkpoint file? Is the checkpoint named .last_spq0 by default? I noticed a .last_spq0 file in my directory, but since I have 4 instances running, they're overwriting each other.

[Andi47]

The .last_spq0 contains information which Q was the last one sieved. This information is also contained in the output file (and normally this is not lowt when there is a power outage). When starting the siever with the -R flag, the siever will parse the last special Q from the last complete line in the outputfile and then continues sieving from where it was interrupted. So the .last_spq0 file is not needed for continuing an interrupted range.

[EdH]

Originally Posted by Andi47

The .last_spq0 contains information which Q was the last one sieved. This information is also contained in the output file (and normally this is not lowt when there is a power outage). When starting the siever with the -R flag, the siever will parse the last special Q from the last complete line in the outputfile and then continues sieving from where it was interrupted. So the .last_spq0 file is not needed for continuing an interrupted range.

Thanks! I guess I could have just restarted with -R, then. I didn't see any resume files, like I do when I use Aliqueit, so I mistook that for meaning I had to restart from scratch. I shall try to remember this for future work.

[EdH]

Originally Posted by EdH

...If someone wants some or all of 16M-20M, let me know. I'll plod along unless or until...

I am retracting this portion of post #7. I am now within the 17M portion of the range and expect to continue through 20M. 24M-26M is still available...