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What is the way to prove performance improvement?

Hi all,

Recently I pull 3 PRs about performance improvements[1][2][3]. Unit tests
will verify their correctness, and in the real scenario, we have benchmark
report to confirm that they do help for performance.

I wonder what is the formal way to verify a performance improvement. Is it
to give out a benchmark report, or run a standard benchmark, or add
performance test(I don't know how to do it), or anything else.

Looking forward for your reply.


[1] https://github.com/apache/flink/pull/6339
[2] https://github.com/apache/flink/pull/6345
[3] https://github.com/apache/flink/pull/6353