$ time ./rtoa-pgatram t1.txt >cpp.tmp
read_input_file   : 3999000 items
read file time    :    0.136 secs
roman_to_dec time :    0.116 secs
output time       :    0.187 secs

real    0m0.450s
user    0m0.416s
sys     0m0.034s

$ time perl rtoa-pgatram.pl t1.txt >pgatram.tmp
rtoa pgatram start
read_input_files : 1 secs
roman_to_arabic  : 4 secs
output           : 1 secs
total            : 6 secs

real    0m6.259s
user    0m6.131s
sys     0m0.128s

$ time perl rtoa-pgatram-mce.pl t1.txt >mce.tmp
rtoa pgatram start
time  1 thread   : 5.808 secs
time  8 threads  : 1.151 secs ( 5.05x)
time 16 threads  : 0.643 secs ( 9.03x)
time 32 threads  : 0.347 secs (16.74x)
time 64 threads  : 0.225 secs (25.81x)

          1 thd     8 thds   16 thds   32 thds   64 thds
real    0m5.835s  0m1.178s  0m0.671s  0m0.375s  0m0.252s
user    0m5.832s  0m9.064s  0m8.874s  0m8.935s  0m9.698s
sys     0m0.008s  0m0.024s  0m0.030s  0m0.073s  0m0.136s