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$ perl createblinker.pl 500000 -900000 100 >x.tmp 2>y.tmp

c++              138 MB    4 secs

...
2 nums into 1  1,510 MB   39 secs   40 secs   42 secs
shorter impl   1,661 MB   40 secs   42 secs   44 secs

$ /opt/cperl-5.24.3c/bin/cperl -I. tbench1.pl x.tmp 2
cell count at start = 1500000
...
time taken:  37 secs   - two numbers into one
time taken:  37 secs   - shorter implementation