$ time ./rtoa-pgatram-fixed t1.txt t1.txt t1.txt t1.txt >f4.tmp
read_input_files  : 15996000 items
read file time    :    0.759 secs
roman_to_dec time :    0.367 secs
output time       :    1.032 secs
total time        :    2.160 secs

real    0m2.179s
user    0m1.908s
sys     0m0.270s

$ cmp f4.tmp fixed4.tmp