20230329, 17:00  #1090 
Random Account
Aug 2009
Oceanus Procellarum
3027_{10} Posts 
I use p/sec as a relative speed indicator. On my aging i7 hardware, it will run between 500K and 650K with 7 threads. I have tried 8, but the Windows GUI gets sluggish at times. It is fine at 7. Of course, this throughput depends on how large the series is. There are 36 k's in the series I am running now for CRUS. A smaller series means a little faster. It would be nice if srsieve2 could run faster, but it would need to maintain the stability it has now. This is where the "not broken, don't fix" idea comes from.

20230403, 01:01  #1091 
Jun 2003
1631_{10} Posts 
For version 2_4.0 I am getting
Code:
twinsieve.exe k2 K1000000 n1000000 r b2 p3 P10e14 twinsieve v1.3, a program to find factors of k*b^n+1/1 numbers for fixed b and n and variable k Sieve started: 3 < p < 1e15 with 499999 terms (2 < k < 1000000, k*2^1000000) (expecting 484095 factors) p=0, 0.000 p/sec, no factors found Thanks 
20230403, 08:57  #1092  
Just call me Henry
"David"
Sep 2007
Liverpool (GMT/BST)
6225_{10} Posts 
Quote:


20230403, 12:05  #1093  
"Mark"
Apr 2003
Between here and the
16467_{8} Posts 
Quote:


20230403, 13:34  #1094  
"Mark"
Apr 2003
Between here and the
3^{3}×277 Posts 
Quote:


20230404, 02:05  #1095 
Jun 2003
7×233 Posts 
Code:
twinsieve.exe W16 k2 K1000000 n1000000 r b2 p3 P10e14 fA t1 r twinsieve v1.6, a program to find factors of k*b^n+1/1 numbers for fixed b and n and variable k Sieve started: 3 < p < 1e15 with 2 terms (3 < k < 999999, k*2^1000000) (expecting 2 factors) Increasing worksize to 80000 since each chunk is tested in less than a second Increasing worksize to 10000000 since each chunk is tested in less than a second Increasing worksize to 50000000 since each chunk is tested in less than a second Decreasing worksize to 25000000 since each chunk needs more than 5 seconds to test p=82453759727, 57.39M p/sec, 1 factors found at 180 sec per factor (last 1 min), 0.0% done. ETC 20230412 17:16 CTRLC accepted. Threads will stop after sieving to 158741299859 Sieve interrupted at p=160495427809. CPU time: 410.95 sec. (21.41 sieving) (4.20 cores) Fatal Error: Something is wrong. Counted terms (0) != expected terms (1) 
20230404, 02:13  #1096  
Jun 2003
1631_{10} Posts 
Quote:
You can eliminate in TestMegaPrimeChunk() or wherever you think it would be appropriate. 

20230404, 12:36  #1097  
"Mark"
Apr 2003
Between here and the
3^{3}×277 Posts 
Quote:


20230404, 15:57  #1098 
Random Account
Aug 2009
Oceanus Procellarum
3027_{10} Posts 
srsieve2 uses values of n and fbncsieve uses values of k.
I don't believe this is a 1to1 relationship. So, what is the conversion value for n to k? 
20230404, 17:16  #1099 
"Mark"
Apr 2003
Between here and the
16467_{8} Posts 

20230404, 18:18  #1100 
Random Account
Aug 2009
Oceanus Procellarum
3·1,009 Posts 
