Benchmark: running Alba_1, Alba_2, rbi_fortran, each for at least 5 CPU seconds...
    Alba_1:  6 wallclock secs ( 5.31 usr +  0.00 sys =  5.31 CPU) @ 3994.16/s (n=21217)
    Alba_2:  6 wallclock secs ( 5.41 usr +  0.00 sys =  5.41 CPU) @ 4789.68/s (n=25893)
rbi_fortran:  5 wallclock secs ( 5.26 usr +  0.00 sys =  5.26 CPU) @ 5211.78/s (n=28266)