I ran this myself, and visnu's code is broken in your benchmarking. visnu's code is checking the %common hash for the common words, and you don't have such a hash defined. Since the other benchmarked code has setup code within the benchmarks (setting up the common words hash), we should do that for visnu's, so add this at the beginning: 
    my %common;
    @common{@common} = (1) x @common;

[download]
Also, the PMGurus code doesn't work quite right, as it doesn't lower-case the words in the grep.

After taking out the PMGurus code, and fixing up visnu's, I got: 

    Benchmark: timing 1000 iterations of Odud, btrott, visnu...
        Odud:   4 secs ( 3.55 usr  0.00 sys =  3.55 cpu)
        btrott: 2 secs ( 2.27 usr  0.00 sys =  2.27 cpu)
        visnu:  4 secs ( 3.98 usr  0.00 sys =  3.98 cpu)

[download]

In reply to RE: RE: List processing (benchmark results) by btrott
in thread List processing performance by Odud

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