name   bench_output_fraction.txt ns/iter  bench_output_fraction.txt ns/iter  diff ns/iter  diff %  speedup 
 add    1                                  1                                             0   0.00%   x 1.00 
 add2   1                                  1                                             0   0.00%   x 1.00 
 add3   1                                  1                                             0   0.00%   x 1.00 
 add4   1                                  1                                             0   0.00%   x 1.00 
 empty  1                                  1                                             0   0.00%   x 1.00