laptop:~/tmp/monk-test> ~/monk.pl -50
laptop:~/tmp/monk-test> ~/monk.pl 100
Benchmark: timing 100 iterations of chdir, no_chdir...
     chdir:  2 wallclock secs ( 1.39 usr  0.40 sys +  0.12 cusr  0.10 csys =  2.01 CPU) @ 55.87/s (n=100)
  no_chdir:  3 wallclock secs ( 1.50 usr  1.08 sys +  0.09 cusr  0.17 csys =  2.84 CPU) @ 38.76/s (n=100)
           Rate no_chdir    chdir
no_chdir 38.8/s       --     -31%
chdir    55.9/s      44%       --
laptop:~/tmp/monk-test> ls
0  1  a  aa
laptop:~/tmp/monk-test> rm -rf *
laptop:~/tmp/monk-test> ~/monk.pl -100
laptop:~/tmp/monk-test> ~/monk.pl 100
Benchmark: timing 100 iterations of chdir, no_chdir...
     chdir:  4 wallclock secs ( 2.98 usr  0.71 sys +  0.13 cusr  0.12 csys =  3.94 CPU) @ 27.10/s (n=100)
  no_chdir:  8 wallclock secs ( 3.03 usr  3.98 sys +  0.13 cusr  0.21 csys =  7.35 CPU) @ 14.27/s (n=100)
           Rate no_chdir    chdir
no_chdir 14.3/s       --     -47%
chdir    27.1/s      90%       --