Status: New
Owner: ----
New issue 3360 by [email protected]: Setting expando properties with
special characters in property name onto a function creates memory bloat
http://code.google.com/p/v8/issues/detail?id=3360
Tested in Chrome 37.0.2019.0 canary and 36.0.1985.32 beta
Setting expando like "foo-bar" onto a function object is much more
expensive than setting an expando with field name "foobar". This behavior
is non-intuitive and very hard to track down in real apps. Admittedly, it's
not common to set expandos like these on functions.
During my testing I noticed that characters that would require the field
name to be escaped are problematic, that primarily includes "-" and ".".
Characters like "$" and "_" are not causing the issue.
Test case:
// establish baseline
x = [];
// heap size: ~3MB
// set expando without any special characters:
x.length = 0;
i=1000000;
while (i--) {
var ff;
(function(i) { function f() { return i; }; ff = f}(i));
// set simple expando
ff['foobar'] = null;
x.push(ff)
}
// heap size: ~120MB
// set expando with "-" in the field name:
x.length = 0;
i=1000000;
while (i--) {
var ff;
(function(i) { function f() { return i; }; ff = f}(i));
// set expando with "-" character
ff['foo-bar'] = null;
x.push(ff)
}
// heap size: ~500MB
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