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A quick change to your benchmark measures more accurately what we are talking about. Assume the evals and string qoutes are right because you lost me in there somewhere.

use strict; use warnings; use Benchmark("cmpthese"); cmpthese(-1, { 'double' , q !eval q {$a = "this is a string \$i"}!, 'single' , q !eval q {$b = 'this is a string $i'}!, 'double no $', q !eval q {$a = "this is a string"}!, 'single no $', q !eval q {$b = 'this is a string'}!, }); __DATA__ C:\test>perl Rate double single double no $ single no $ double 22226/s -- -16% -17% -17% single 26331/s 18% -- -2% -2% double no $ 26733/s 20% 2% -- 0% single no $ 26733/s 20% 2% 0% -- C:\test>perl Rate double single double no $ single no $ double 21065/s -- -20% -21% -21% single 26331/s 25% -- -1% -2% double no $ 26714/s 27% 1% -- -0% single no $ 26756/s 27% 2% 0% -- C:\test>perl Rate double single single no $ double no $ double 21966/s -- -17% -18% -18% single 26551/s 21% -- -1% -1% single no $ 26733/s 22% 1% -- -1% double no $ 26947/s 23% 1% 1% -- C:\test>perl Rate double single single no $ double no $ double 22226/s -- -14% -16% -17% single 25960/s 17% -- -1% -3% single no $ 26331/s 18% 1% -- -2% double no $ 26733/s 20% 3% 2% -- C:\test>perl Rate double double no $ single single no $ double 20785/s -- -19% -21% -23% double no $ 25551/s 23% -- -3% -5% single 26211/s 26% 3% -- -3% single no $ 27019/s 30% 6% 3% --

You see a consistent win for single quotes, I don't think it is enough to worry about though. If you are dealing with 100k strings and you want to decide if you should sinle or double quote them, then you probably made a bad choice to load 100k variables ;)

Update: Added benchmarks for strings with no $ in them. Looks like perl must do a prescan to see if it needs work or not. I could of course be completely crazy.

Eric Hodges

In reply to Re^3: To Single Quote or to Double Quote: a benchmark by eric256
in thread To Single Quote or to Double Quote by NateTut

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