performance Re: string not block Re: SPUG: interpolating into a string variable

[Brian Hatch]

> Interestingly, my brain-dead workaround seems to perform slightly better
> than eval

Not suprising at all.  Your solution (which required you knew the
potential variable names) was all already-compiled perl code.  A
few substitutions with hash lookups, etc.

Eval (or s///e) requires that perl read your code and compile
it internally before running it - an expensive operation.
No doubt it's slower.  It's more robust (no need to know what's
in the string first) but it's slow.

However the 'my' in the eval case may be slowing things
down too - it's not only setting the value, it's making
scoping decisions.



--
Brian Hatch                  "This product is defective.
   Systems and                It only holds one baby."
   Security Engineer         -- Bree, looking in baby magazines,
http://www.ifokr.org/bri/       shortly after learning we're
                                having twins...
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