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use Benchmark qw(timethese);

...
      glob "/bin/*";
  },
});

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  Ordinary:  2 wallclock secs ( 0.61 usr +  1.64 sys =  2.25 CPU) @ 23
+7.78/s (n=535)
Schwartzian:  2 wallclock secs ( 1.52 usr +  0.76 sys =  2.28 CPU) @ 2
+02.19/s (n=461)

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Benchmark: timing 5000 iterations of Ordinary, Schwartzian...
  Ordinary: 21 wallclock secs ( 6.46 usr + 14.78 sys = 21.24 CPU) @ 23
+5.40/s (n=5000)
Schwartzian: 26 wallclock secs (17.15 usr +  8.45 sys = 25.60 CPU) @ 1
+95.31/s (n=5000)

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Linux dell 2.6.5-7.104-smp #1 SMP Wed Jul 28 16:42:13 UTC 2004 i686 i6
+86 i386 GNU/Linux

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Summary of my perl5 (revision 5.0 version 8 subversion 3) configuratio
+n:
...
    /usr/lib/perl5/vendor_perl/5.8.3/i586-linux-thread-multi
    /usr/lib/perl5/vendor_perl/5.8.3
    /usr/lib/perl5/vendor_perl