[chmrr@supox chmrr]$ wc -l /var/log/messages
   4442 /var/log/messages
[chmrr@supox chmrr]$ perl -w tailbm.pl -10 100 /var/log/messages
Benchmark: running f_rb_obj, f_rb_obj_u, f_rb_tie, f_rb_tie_u, file_tail, grinder, lastn, lastn_getc, tie_file, each for at least 10 CPU seconds...
  f_rb_obj: 11 wallclock secs (10.35 usr +  0.22 sys = 10.57 CPU) @ 662.54/s (n=7003)
f_rb_obj_u: 11 wallclock secs (10.54 usr +  0.12 sys = 10.66 CPU) @ 650.19/s (n=6931)
  f_rb_tie: 11 wallclock secs (10.48 usr +  0.20 sys = 10.68 CPU) @ 545.13/s (n=5822)
f_rb_tie_u: 12 wallclock secs (10.39 usr +  0.16 sys = 10.55 CPU) @ 537.25/s (n=5668)
 file_tail: 12 wallclock secs (10.60 usr +  0.14 sys = 10.74 CPU) @ 333.71/s (n=3584)
   grinder: 10 wallclock secs (10.49 usr +  0.07 sys = 10.56 CPU) @ 26.23/s (n=277)
     lastn: 12 wallclock secs ( 7.79 usr +  2.63 sys = 10.42 CPU) @ 26.97/s (n=281)
lastn_getc: 11 wallclock secs ( 8.83 usr +  1.46 sys = 10.29 CPU) @ 28.38/s (n=292)
  tie_file: 11 wallclock secs (10.15 usr +  0.12 sys = 10.27 CPU) @  3.89/s (n=40)