-j | CPU_time/(wall_clock_time * max(-j,8))
 1   1.06933845731539939610
 2   1.02796257796257796257
 3   0.99679823903146730701
 4   0.96713300114986584898
 5   0.93304268012849931161
 6   0.90030621172353455818
 7   0.82963645099295323510
 8   0.76881602112676056338
 9   0.76120265972824515754
10   0.76608229498696030135
11   0.77513131018383425736
12   0.76843317972350230414
13   0.77193362193362193362
14   0.77291366906474820143
15   0.76810099573257467994
16   0.77250286204922724670
17   0.77032404775440591245
18   0.76431997742663656884
19   0.76666195989833380401
20   0.76966053748231966053