Search of 17clues tests band 331 analysis

http://pagesperso-orange.fr/gpenet/SK17TEST/test.htm

The results for the band  index 331 are interesting.

All bands 1 of index >331 are closed, so the results here are a king of “worse case” for the bands to come.

 

Band 331 produces 26818 bands 3

With 23 659 bands 2 (ratio 1.13) in the entry file 1 (566 and 656)

With 23 411 bands 2 in the entry file 2 (656 bands 2/3 exchanged)

 

Due to a windows 10 brutal update, statistics are available for the last bands 2

 

The first set of results if for “entry file 1” (566 + 656) 8639 last bands 2

 

                 time/      av b3

bands3     9797  17.3455    1.13

bands1+2   8639  19.67     

            per band  

XY          3 769 488 864  

  passing ua filter      0.1442%    5 436 073 

  test brute force        0.0522%    1 968 688 

  valid brute force      0.0400%    1 509 554 

  giving bands 3          0.0066%      250 284 

                  av b3

Bands3 processed          265 032    1.06

  critical      65.64%     173 979   

  miss 1         27.15%     71 965   

  miss 234      7.20%      19 076   

  miss 56        0.00%           11   

 

We see here average 19.67 seconds per band 2 significantly above the value in the first bands 2 of the band 1 300 (10.71). This is for an average 3.8 billions of XY per band 2.

We have here an intensive use of the 2X3Y . Only 0.05% of the XY reach the brute force test for bands 1+2

And as usual, a majority if bands 3 processed are in critical mode.

 

The second set of results if for the “entry file 2” (656) 8083 last bands 2

 

bands3     9239  11.7077    1.14

bands1+2   8083  13.38     

            per band  

XY          2 638 531 453  

  passing ua filter      0.1282%    3 382 045 

  test brute force        0.0464%    1 224 665 

  valid brute force      0.0358%      944 286 

  giving bands 3          0.0056%      147 446 

                  av b3

Bands3 processed          157 676    1.07

  critical      66.66%     105 108   

  miss 1         26.56%     41 877   

  miss 234      6.78%      10 686   

  miss 56        0.00%            6   

 

The average run time per band is still high (13.38 seconds), reflecting the high XY count of 2.7 billions for the 656 unique pass

 

The average number of XY processed per second is around 250 millions

 

In both cases, the ratio of bands 3 processed is very low (between 20 and 30 per band 2); the phase 2 is surely not critical.