20140530, 23:10  #1 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
2^{2}·3^{3}·47 Posts 
The Third Megabit Drive
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=14001680k 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) Code:
Range of n Tested by Status 1,400,0001,404,000  Carlos  Complete 1,404,0001,408,000  Trilo  Complete 1,408,0001,412,000  Thomas  Complete 1,412,0001,418,000  Carlos  Complete 1,418,0001,450,000  kracker  Complete 1,450,0001,720,000  Batalov  Complete (5 primes) 1,720,0001,728,000  Carlos  Complete 1,728,0001,740,000  kracker  Complete 1,740,0001,750,000  Carlos  Complete 1,750,0001,800,000  kracker  Complete 1,800,0001,820,000  Carlos  Complete 1,820,0001,834,000  Batalov  Complete (2 primes) 1,834,0001,838,000  Carlos  Complete 1,838,0001,854,000  Batalov  Complete (1 prime) 1,854,0001,866,000  Carlos  Complete 1,866,0002,000,000  Batalov  Complete 2,000,0002,003,175  Carlos  Complete 2,003,1762,025,000  Thomas11  Complete 2,025,0002,027,970  Carlos  Complete 2,027,9712,050,000  Thomas11  Complete 2,050,0002,050,963  Carlos  Complete 2,050,9632,060,000  Curtis  Complete 2,060,0002,102,000  Kosmaj  Complete 2,102,0002,200,000  gd_barnes  Complete (3 primes) Code:
Range of n Tested by Status 1,400,0001,420,000  Carlos  Complete 1,420,0001,680,000  Batalov  Complete 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=18501960k interval, where nonAVX machines will use the 128k FFT instead. PS (Please attach zipped results naming like TMD_1400to1405.txt.zip and so on) Updated 20210504 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) . Last fiddled with by LaurV on 20210505 at 04:14 Reason: status update 
20140531, 01:16  #2 
Nov 2003
2·1,811 Posts 
Hi Carlos
Thanks for starting the drive. I'm busy right now but will join the drive soon. Happy hunting! 
20140531, 01:40  #3 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
2^{2}·3^{3}·47 Posts 
Taking 14001404.
Edit: Fast machines can test a candidate at n=1.4M in 500 seconds or less. Come on guys! Last fiddled with by pinhodecarlos on 20140531 at 02:09 
20140531, 02:33  #4 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
11724_{8} Posts 
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 710 days of crunching as usual done on the other drives.
Carlos 
20140601, 04:01  #5 
"W. Byerly"
Aug 2013
81*2^31743531
10000101_{2} Posts 
Taking 1404 to 1408

20140601, 04:03  #6 
"W. Byerly"
Aug 2013
81*2^31743531
133_{10} Posts 
About automatically splitting the files
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?

20140601, 09:04  #7 
Feb 2003
2^{7}·3·5 Posts 
I splitted the 1.42M 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 nonAVX 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... Last fiddled with by Thomas11 on 20140603 at 15:43 
20140601, 09:05  #8 
Feb 2003
2^{7}×3×5 Posts 
Taking 14081412.
Last fiddled with by Thomas11 on 20140601 at 12:15 
20140601, 12:17  #9 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
5076_{10} Posts 
Taking 14121418.

20140601, 14:16  #10 
"Mr. Meeseeks"
Jan 2012
California, USA
3^{2}·241 Posts 
Taking 14181430.
Last fiddled with by kracker on 20140601 at 14:16 
20140602, 01:33  #11 
"Mr. Meeseeks"
Jan 2012
California, USA
3^{2}·241 Posts 
Hmm... going though them faster than expected, 2k done. Taking 14301450. (separate reservation if possible please)
Last fiddled with by kracker on 20140602 at 01:33 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
The Second Megabit Drive  Kosmaj  Riesel Prime Search  461  20220410 09:08 
The First Megabit Drive  Kosmaj  Riesel Prime Search  373  20201112 15:48 
RPS 11th Drive: Search for more megabit primes  Kosmaj  Riesel Prime Search  186  20141204 14:03 
Any interest in yet another submegabit drive?  Kosmaj  Riesel Prime Search  20  20111117 04:10 
The 3rd RPS Drive: lowweight Ks for megabit prime  lsoule  Riesel Prime Search  140  20090302 15:01 