caiconghui commented on pull request #4131:
URL: https://github.com/apache/incubator-doris/pull/4131#issuecomment-663330717


   > @caiconghui Hi,how many performance improvement this PR will get?
   @kangkaisen 
   for single AtomicLong value and single LongAdder value, i test increment 
opertion with 30 threads in 2 seconds in my macbook, and I find the Throughput 
increased by about 60%  when i used LongAdder instead of AtomicLong.
   
   as for volatile long and AtomicLong, the performance is almost same, but if 
volatile can be enough to ensure thread-safe, then we should take a more 
lightweight solution.


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