Dismal performance of String.intern()
Aleksey Shipilev
aleksey.shipilev at oracle.com
Tue Jun 11 08:52:10 UTC 2013
On 06/11/2013 12:31 PM, Remi Forax wrote:
> On 06/10/2013 08:06 PM, Steven Schlansker wrote:
> Hi Steven,
> the main issue is that intern() doesn't work in isolation,
>
> I think it's better to change the JSON Parser implementation to use it's
> own cache (or not) and not rely on String.intern().
+1.
IMO, String.intern() is the gateway into VM symbol table, and should be
regarded as such. The improvements for String.intern(), if any, then
should be on the VM (native) side.
Also, I think most people confuse String interning and String
de-duplication. Using interning to improve memory footprint is the
overkill. Smart deduplicators may carefully balance the overheads of
deduplication vs. the memory footprint.
-Aleksey.
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