The Third Megabit Drive

[pinhodecarlos]

We are starting the Third Megabit Drive.
The k's on this current drive, as of 30 May 2014, are at level n=1.4M therefore the goal of this drive is to take them up to 2M. Goal can be prior extended.

The k's of this drive are:

203, 205, 219, 227, 235, 257, 259

Update (June 03, 2014): adding k=275 and k=295 to the drive from n=1680k. Range n=1400-1680k for both k added as "batch 2".

Update (June 08, 2014): batch 2 completed.

Update (July 09, 2014): The drive is completed to n=2M.

Update (June 16, 2015): Reopening the drive from n=2M.

Please help yourself and happy hunting!

Status

Batch 1 (7 k's to n=1680k and all 9 k's from n=1680k)

    Range of n        Tested by       Status
1,400,000-1,404,000 - Carlos        - Complete
1,404,000-1,408,000 - Trilo         - Complete
1,408,000-1,412,000 - Thomas        - Complete
1,412,000-1,418,000 - Carlos        - Complete
1,418,000-1,450,000 - kracker       - Complete
1,450,000-1,720,000 - Batalov       - Complete (5 primes)
1,720,000-1,728,000 - Carlos        - Complete
1,728,000-1,740,000 - kracker       - Complete
1,740,000-1,750,000 - Carlos        - Complete
1,750,000-1,800,000 - kracker       - Complete
1,800,000-1,820,000 - Carlos        - Complete
1,820,000-1,834,000 - Batalov       - Complete (2 primes)
1,834,000-1,838,000 - Carlos        - Complete
1,838,000-1,854,000 - Batalov       - Complete (1 prime)
1,854,000-1,866,000 - Carlos        - Complete
1,866,000-2,000,000 - Batalov       - Complete
2,000,000-2,003,175 - Carlos        - Complete
2,003,176-2,025,000 - Thomas11      - Complete
2,025,000-2,027,970 - Carlos        - Complete
2,027,971-2,050,000 - Thomas11      - Complete
2,050,000-2,050,963 - Carlos        - Complete
2,050,963-2,060,000 - Curtis        - Complete
2,060,000-2,102,000 - Kosmaj        - Complete
2,102,000-2,200,000 - gd_barnes     - Complete (3 primes)

Batch 2 (k=275 and 295 from n=1400k to n=1680k)

    Range of n        Tested by       Status
1,400,000-1,420,000 - Carlos        - Complete
1,420,000-1,680,000 - Batalov       - Complete

Test Files
Extensively sieved by Psieve (the latest sieve file of July 31, 2011)

See attachment with candidates from n=2M to 3M (split into 2k blocks, kindly prepared by Carlos).

FFT lengths
Up to about n=1820k the 112k FFT will be used. AVX machines will benefit from the intermediate 120k FFT in the n=1850-1960k interval, where non-AVX machines will use the 128k FFT instead.

PS (Please attach zipped results naming like TMD_1400to1405.txt.zip and so on)


Updated 2021-05-04

Found Primes:
203 [0]:
205 [2]: 1537779, 1666435
219 [1]: 2178673
227 [0]:
235 [3]: 1718787, 1824515, 2163273
257 [2]: 1658254, 2108554
259 [1]: 1695723
275 [1]: 1846390
295 [1]: 1832129

Total: 11 primes
(Found primes for 7 out of 9 k's)
.

[Kosmaj]

Hi Carlos

Thanks for starting the drive. I'm busy right now but will join the drive soon.
Happy hunting!

[pinhodecarlos]

Taking 1400-1404.

Edit: Fast machines can test a candidate at n=1.4M in 500 seconds or less. Come on guys!

[pinhodecarlos]

Sorry for not splitting the input files into chunks but I don't know how to do it automatically. Also as the numbers are very fast to process, on latest Intel processors they can take less than 500 secs, I don't know what is the optimal chunk size for now for this drive, if 2k or 4k or 6k, for a period of 7-10 days of crunching as usual done on the other drives.

Carlos

[Trilo]

Taking 1404 to 1408

[Trilo]

I may be able to help you out by automatically splitting the files if you want. Do you need them in splits of 1000 or 2000?

[Thomas11]

I splitted the 1.4-2M input file into 2k blocks (see attachment). Each block contains about 400 test candidates.

The attached ZIP file also contains a file called "url_list.txt" indicating the FFT lengths and percentages (for non-AVX machines). This file is only relevant for Kosmaj when uploading the files to his server...

Edit: Attachment removed. Please use the file in the top post of this thread...

[Thomas11]

Taking 1408-1412.

[pinhodecarlos]

Taking 1412-1418.

[kracker]

Taking 1418-1430.

[kracker]

Hmm... going though them faster than expected, 2k done. Taking 1430-1450. (separate reservation if possible please)