Status: New
Owner: ----
New issue 1851 by [email protected]: Accessing "const"s from the
environment is significantly slower than accessing "var"s.
http://code.google.com/p/v8/issues/detail?id=1851
Here - https://gist.github.com/1431640 - is a simple benchmark that
indicates an unexpected performance skew in V8. One would expect accessing
symbols declared using "const" to be at least as fast as those declared
using "var"s, but in the code linked to, the `constAccess` function runs
about 3x slower than the `varAccess` function.
I reproduce my measurements below. All numbers are times in milliseconds
and smaller is better.
{{{
My measurements using node.js v0.6.3 on MacOSX -
ctl = {"min":182,"max":187,"mean":183.8,"spread":0.98}
con = {"min":770,"max":789,"mean":774.92,"spread":3.16}
var = {"min":196,"max":253,"mean":224.42,"spread":5.96}
(The spread rounded to two decimal places)
}}}
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