[concurrency-interest] LongAdder in JDK?

Adrian Tarau adrian.tarau at gmail.com
Fri Dec 9 11:00:46 EST 2011

This chart shows you why you should use JDK classes before thinking you 
can outsmart the default implementations :)
StrippedAtomicLong is my naive implementation of a LongAdder using a 
fixed number of AtomicLong instances and the masked thread id as the 
index(using 64 AtomicLongs - best performance, increasing this number 
doesn't help for maximum 20 threads).

This chart was created using Caliper <http://code.google.com/p/caliper>.

On 12/08/2011 04:38 PM, Doug Lea wrote:
> On 12/08/11 15:04, Adrian Tarau wrote:
>> There are any plans to include LongAdder in JDK
> Yes. Everything in package jsr166e is a candidate for JDK8.
>> Is this the stable version of the LongAdder?
>> http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/?pathrev=MAIN 
> Yes. Comments, experience reports, etc are welcome.
> -Doug
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