Status: New
Owner: ----
New issue 2869 by [email protected]: Substring of huge string retains
huge string in memory
http://code.google.com/p/v8/issues/detail?id=2869
Steps to reproduce:
var s = "a huge, huge, huge string...";
s = s.substring(0, 5);
Expected results: s takes five bytes of memory, plus some overhead.
Actual results: s takes a huge, huge, huge amount of memory.
Unfortunately, most String functions use substring() or no-ops internally:
concatenating with empty string, trim(), slice(), match(), search(),
replace() with no match, split(), substr(), substring(), toString(),
trim(), valueOf().
My workaround is:
function unleakString(s) { return (' ' + s).substr(1); }
But it's not satisfying, because it breaks an abstraction and forces me to
think about memory allocation.
Perhaps there should be some special logic for handling substring() when
the output string length is less than, say, 0.125 times the input string
length? that's not perfect, but in my opinion, the pros of this solution
outweigh the cons.
This crops up constantly when scraping HTML.
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