Gabor Gevay created FLINK-8117:
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Summary: Eliminate modulo operation from RoundRobinChannelSelector
and RebalancePartitioner
Key: FLINK-8117
URL: https://issues.apache.org/jira/browse/FLINK-8117
Project: Flink
Issue Type: Improvement
Components: Local Runtime, Streaming
Reporter: Gabor Gevay
Assignee: Gabor Gevay
Priority: Minor
Fix For: 1.5.0
Both {{RoundRobinChannelSelector}} and {{RebalancePartitioner}} use a modulo
operation to wrap around when the current channel counter reaches the number of
channels. Using an {{if}} would have better performance.
A division with 32 bit operands is ~25 cycles on modern Intel CPUs \[1\], but
the {{if}} will be only 1-2 cycles on average, since the branch predictor can
most of the time predict the condition to be false.
\[1\] http://www.agner.org/optimize/instruction_tables.pdf
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