Review Request CR#7118743 : Alternative Hashing for String with Hash-based Maps

Andrew Haley aph at
Mon May 28 07:13:23 UTC 2012

On 05/26/2012 12:29 PM, Doug Lea wrote:
> (Sometime this summer, I hope to write up something on
> the various "little" coding issues that may be applicable
> for improving performance of library code. As people
> mentioned wrt the similar private accessor case,
> most of these issues are not interesting/useful for
> application code, but there's no reason not to address
> them inside heavily used core libraries. The effects
> are difficult to measure in any small set of tests using
> these library components, so usually the best course of action
> is to avoid known potential performance issues.)

The thing that bothers me about this is that such optimizations may be
rather VM-specific, sometimes to the extent of depending on how
HotSpot generates code for a particular case.  Given that the OpenJDK
libraries are now used more widely, and hopefully this will increase,
what shall we do?


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