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jmo@foo:~> ls /some/small/dir|wc -l
322
...
allready opendir on large dir: 102 wallclock secs (87.82 usr + 13.04 s
+ys = 100.86 CPU) @ 49.57/s (n=5000)
ls on large dir: 57 wallclock secs ( 0.51 usr  1.99 sys + 27.62 cusr 2
+7.09 csys = 57.21 CPU) @ 2000.00/s (n=5000)
opening dir on large dir: 101 wallclock secs (88.11 usr + 12.37 sys = 
+100.48 CPU) @ 49.76/s (n=5000)

use Benchmark;
use strict;
...

}