benchmarking keys

gistfile1.txt

# NOTE: %HASH and $HASH are package vars; %hash and $hash are lexical vars

                       Rate keys %$HASH keys %$hash keys hashref() keys %{$hash} keys %{ hashref() } keys %hash keys %HASH keys $hash keys $HASH
keys %$HASH          6335/s          --          0%            -0%           -0%                 -0%       -42%       -42%       -42%       -43%
keys %$hash          6335/s          0%          --            -0%           -0%                 -0%       -42%       -42%       -42%       -43%
keys hashref()       6364/s          0%          0%             --            0%                  0%       -42%       -42%       -42%       -42%
keys %{$hash}        6364/s          0%          0%             0%            --                  0%       -42%       -42%       -42%       -42%
keys %{ hashref() }  6364/s          0%          0%             0%            0%                  --       -42%       -42%       -42%       -42%
keys %hash          10904/s         72%         72%            71%           71%                 71%         --         0%        -1%        -1%
keys %HASH          10904/s         72%         72%            71%           71%                 71%         0%         --        -1%        -1%
keys $hash          11008/s         74%         74%            73%           73%                 73%         1%         1%         --        -0%
keys $HASH          11060/s         75%         75%            74%           74%                 74%         1%         1%         0%         --