20100615, 00:53  #34  
"Lennart"
Jun 2007
2^{5}·5·7 Posts 
Quote:
I tried 20T21T on a Linux (ubuntu) 64bit CPU c2q 6600 2.6Ghz Time 28 min. sieved to 100G ~3.5M candidates left !! Should it be that many ?? Lennart 

20100615, 00:59  #35  
May 2010
499 Posts 
Quote:
But even then, sieving 1T to p=100M in half an hour is really fast. One quad core machine could finish the entire k=1500T range in less than a week! 

20100615, 01:02  #36  
"Lennart"
Jun 2007
2^{5}·5·7 Posts 
Quote:
Lennart 

20100615, 01:14  #37 
Jun 2003
11132_{8} Posts 

20100615, 01:24  #38 
"Lennart"
Jun 2007
2^{5}×5×7 Posts 

20100615, 01:35  #39 
Jun 2003
2·3^{4}·29 Posts 

20100615, 01:38  #40  
"Lennart"
Jun 2007
1120_{10} Posts 
Quote:
Lennart EDIT: I have started 2021T with those changes. Last fiddled with by Lennart on 20100615 at 01:43 

20100615, 02:16  #41  
"Lennart"
Jun 2007
460_{16} Posts 
Quote:
Code:
smirre2@smirre2desktop:~/Desktop/tps_pascal$ ./LuckyMinus.pas 1000000 20 21 smirre2@smirre2desktop:~/Desktop/tps_pascal$ ./LuckyMinus.pas 1000000 20 21 Lucky minus n=1000000 k=2000000000002520999999999985 p<=217645177 2084/2084 = 3037726 smirre2@smirre2desktop:~/Desktop/tps_pascal$ Lennart 

20100615, 03:03  #42 
Jun 2003
2·3^{4}·29 Posts 
That's actually excellent scaling. The selection of these parameters to optimize the total sieving time is an interesting problem  probably needing some experimentation. Especially when running single copy vs multiple copies.
It is probably a good idea to increase SmallPrimes much further, depending on how much time NewPGen takes to get it up to 1e9. 
20100615, 03:05  #43 
Jun 2003
4698_{10} Posts 
I am currently trying to compile a Win64 build. But running into some weird runtime error. Need to troubleshoot

20100615, 03:11  #44 
May 2010
763_{8} Posts 
I have a similar processor (Pentium 4, 3.2 GHz), and I can confirm that it does take about 80 hours to sieve 1T using NewPGen. With the new sieve, it's expected to take 45 hours: 1 hour and 10 minutes using the new sieve to p=100M, and 34 hours to use NewPGen to sieve from p=100M to p=100G.

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