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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2019/07/10 01:57:57 UTC
[GitHub] [incubator-druid] pdeva commented on issue #8031: remove
unnecessary synchronization overhead from complex Aggregators
pdeva commented on issue #8031: remove unnecessary synchronization overhead from complex Aggregators
URL: https://github.com/apache/incubator-druid/issues/8031#issuecomment-509876442
Above benchmark doesn't take lock contention into account. The synchronized keyword has different performance characteristics based on how contended the lock is.
The JIT will convert from thin to fat locks if the lock shows too much contention.
if the lock has no contention, the overhead of synchronized keyword is negligible, but not zero, which is indeed shown in the benchmark above.
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