zhijiangW commented on issue #11088: [FLINK-16012][runtime] Reduce the default number of buffers per channel from 2 to 1 URL: https://github.com/apache/flink/pull/11088#issuecomment-587546662 > So just moving the exclusive buffers to floating pool, is not helping us with this. Yes, that is not the formal solution for our final purpose. My suggestion was only for analyzing the performance regression step by step for better tracing. I wonder that the performance might be sensitive with two factors. One factor is the total amount buffers on receiver side, and another factor is the ratios of exclusive and floating buffers distribution. So if we keep the total buffer amount same, only change the buffer role. If there is no regression for benchmark at all, then we are relieved to only focus on the factor of total floating buffers amount. If not, we should also keep an eye on whether there are extra cost for requesting floating buffers. I hope the second factor is unnecessary worried.
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