Comment #3 on issue 2904 by [email protected]: Mix of integer and long
strings as property names severely degrades object iteration
http://code.google.com/p/v8/issues/detail?id=2904
As an additional test case, attached are two data sets, each containing an
object that maps ~550,000 keys to `true`.
The first set uses keys are that entirely numeric (i.e. "123456789"). The
second set uses keys that are entirely alphanumeric, constructed by
prepending an "a" to each key of the previous set (i.e. "a123456789").
Below is a test case from Node (also reproducible in Chrome, etc.) that
illustrates the different performance characteristics:
$ node test.js
numeric (550000): for-var-in user code hit after 87144 ms
alpha (550000): for-var-in user code hit after 43 ms
Attachments:
v8-issue-2904.tar.gz 4.6 MB
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