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nowadays it's much faster to use substr
I re-ran your benchmark on Linux 2.6.9 i686, perl v5.8.5 built for i386-linux-thread-multi. The difference was much less than what you encountered.
$ perl -w Benchmark: running substr, vec for at least 60 CPU seconds... substr: 67 wallclock secs (60.69 usr + 0.03 sys = 60.72 CPU) @ 0 +.58/s (n=35) vec: 66 wallclock secs (61.33 usr + 0.04 sys = 61.37 CPU) @ 0 +.54/s (n=33) s/iter vec substr vec 1.86 -- -7% substr 1.73 7% --
On Linux 2.6.22-10-386 i686, perl v5.10.0 (different hardware than above):
Benchmark: running substr, vec for at least 60 CPU seconds... substr: 62 wallclock secs (61.69 usr + 0.05 sys = 61.74 CPU) @ 0 +.44/s (n=27) vec: 61 wallclock secs (60.81 usr + 0.05 sys = 60.86 CPU) @ 0 +.39/s (n=24) s/iter vec substr vec 2.54 -- -10% substr 2.29 11% --
Update Mon Feb 11 12:13:38 CET 2008: Added perl 5.10 benchmark on lodin's request.

In reply to Re^3: To Findout Prime number by andreas1234567
in thread To Findout Prime number by babug_prg

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