kezhenxu94 commented on issue #4305: Performance tuning: replace AtomicInteger with AtomicIntegerFieldUpdater URL: https://github.com/apache/skywalking/pull/4305#issuecomment-581040183 > @kezhenxu94 I think you miss an important factor, in the `AtomicIntegerFieldUpdaterImpl`, it is using the refactor, which causes more CPU. This is a memory-CPU tradeoff, I am not sure this is the performance tuning. In my mind, in today's production env, CPU is more valuable than the memory. > > Especially, CPU is affecting latency, response time and throughput more. @wu-sheng as you can see, the updater is `static` and is only instantiated once, and reflection is only use in the instantiation to find the field offset, so the CPU cost is an one-time cost
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