msokolov commented on issue #854: Shared PQ Based Early Termination for 
Concurrent Search
   There is also the option of something in between. To avoid thread 
contention, could we just make  uncoordinated read/write of a minimum minimum 
score. If a thread fails to write (its write is overwritten by some other 
thread with a worse minimum, still an improvement), all it costs you (or some 
other thread) is some extra work, perhaps cheaper than the coordination and 
priority queue or array scanning. You could also choose to write only 
occasionally, to further reduce contention.

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