mumrah edited a comment on pull request #9008: URL: https://github.com/apache/kafka/pull/9008#issuecomment-659665576
Updated the benchmarks with @lbradstreet's suggestions. Here are the results for 3 partitions, 10 topics. GC profiles included. On this branch: ``` Benchmark (partitionCount) (topicCount) Mode Cnt Score Error Units FetchRequestBenchmark.testFetchRequestForConsumer 3 10 avgt 15 2110.741 ± 27.935 ns/op FetchRequestBenchmark.testFetchRequestForReplica 3 10 avgt 15 2021.114 ± 7.816 ns/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer 3 10 avgt 15 3452.799 ± 16.013 ns/op FetchRequestBenchmark.testSerializeFetchRequestForReplica 3 10 avgt 15 3691.157 ± 60.260 ns/op GC Profile (partitionCount) (topicCount) Mode Cnt Score Error Units FetchRequestBenchmark.testFetchRequestForConsumer:·gc.alloc.rate 3 10 avgt 15 4295.532 ± 56.061 MB/sec FetchRequestBenchmark.testFetchRequestForConsumer:·gc.alloc.rate.norm 3 10 avgt 15 9984.000 ± 0.001 B/op FetchRequestBenchmark.testFetchRequestForConsumer:·gc.churn.PS_Eden_Space 3 10 avgt 15 4292.525 ± 56.341 MB/sec FetchRequestBenchmark.testFetchRequestForConsumer:·gc.churn.PS_Eden_Space.norm 3 10 avgt 15 9977.037 ± 28.311 B/op FetchRequestBenchmark.testFetchRequestForConsumer:·gc.churn.PS_Survivor_Space 3 10 avgt 15 0.187 ± 0.027 MB/sec FetchRequestBenchmark.testFetchRequestForConsumer:·gc.churn.PS_Survivor_Space.norm 3 10 avgt 15 0.435 ± 0.060 B/op FetchRequestBenchmark.testFetchRequestForConsumer:·gc.count 3 10 avgt 15 2335.000 counts FetchRequestBenchmark.testFetchRequestForConsumer:·gc.time 3 10 avgt 15 1375.000 ms FetchRequestBenchmark.testFetchRequestForReplica:·gc.alloc.rate 3 10 avgt 15 4416.855 ± 16.429 MB/sec FetchRequestBenchmark.testFetchRequestForReplica:·gc.alloc.rate.norm 3 10 avgt 15 9832.000 ± 0.001 B/op FetchRequestBenchmark.testFetchRequestForReplica:·gc.churn.PS_Eden_Space 3 10 avgt 15 4417.032 ± 24.858 MB/sec FetchRequestBenchmark.testFetchRequestForReplica:·gc.churn.PS_Eden_Space.norm 3 10 avgt 15 9832.358 ± 28.932 B/op FetchRequestBenchmark.testFetchRequestForReplica:·gc.churn.PS_Survivor_Space 3 10 avgt 15 0.186 ± 0.015 MB/sec FetchRequestBenchmark.testFetchRequestForReplica:·gc.churn.PS_Survivor_Space.norm 3 10 avgt 15 0.415 ± 0.033 B/op FetchRequestBenchmark.testFetchRequestForReplica:·gc.count 3 10 avgt 15 2280.000 counts FetchRequestBenchmark.testFetchRequestForReplica:·gc.time 3 10 avgt 15 1376.000 ms FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.alloc.rate 3 10 avgt 15 3256.172 ± 15.524 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.alloc.rate.norm 3 10 avgt 15 12384.000 ± 0.001 B/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Eden_Space 3 10 avgt 15 3255.019 ± 21.484 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Eden_Space.norm 3 10 avgt 15 12379.587 ± 49.161 B/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Survivor_Space 3 10 avgt 15 0.122 ± 0.022 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Survivor_Space.norm 3 10 avgt 15 0.462 ± 0.084 B/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.count 3 10 avgt 15 2054.000 counts FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.time 3 10 avgt 15 1389.000 ms FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.alloc.rate 3 10 avgt 15 3319.965 ± 53.427 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.alloc.rate.norm 3 10 avgt 15 13496.000 ± 0.001 B/op FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Eden_Space 3 10 avgt 15 3320.125 ± 52.812 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Eden_Space.norm 3 10 avgt 15 13496.813 ± 64.774 B/op FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Survivor_Space 3 10 avgt 15 0.126 ± 0.021 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Survivor_Space.norm 3 10 avgt 15 0.512 ± 0.085 B/op FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.count 3 10 avgt 15 2122.000 counts FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.time 3 10 avgt 15 1395.000 ms ``` On trunk: ``` Benchmark (partitionCount) (topicCount) Mode Cnt Score Error Units FetchRequestBenchmark.testFetchRequestForConsumer 3 10 avgt 15 3.457 ± 0.016 ns/op FetchRequestBenchmark.testFetchRequestForReplica 3 10 avgt 15 3.453 ± 0.035 ns/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer 3 10 avgt 15 13214.306 ± 61.158 ns/op FetchRequestBenchmark.testSerializeFetchRequestForReplica 3 10 avgt 15 13147.870 ± 52.318 ns/op GC Profile (partitionCount) (topicCount) Mode Cnt Score Error Units FetchRequestBenchmark.testFetchRequestForConsumer:·gc.alloc.rate 3 10 avgt 15 ≈ 10⁻⁴ MB/sec FetchRequestBenchmark.testFetchRequestForConsumer:·gc.alloc.rate.norm 3 10 avgt 15 ≈ 10⁻⁶ B/op FetchRequestBenchmark.testFetchRequestForConsumer:·gc.count 3 10 avgt 15 ≈ 0 counts FetchRequestBenchmark.testFetchRequestForReplica:·gc.alloc.rate 3 10 avgt 15 ≈ 10⁻⁴ MB/sec FetchRequestBenchmark.testFetchRequestForReplica:·gc.alloc.rate.norm 3 10 avgt 15 ≈ 10⁻⁶ B/op FetchRequestBenchmark.testFetchRequestForReplica:·gc.count 3 10 avgt 15 ≈ 0 counts FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.alloc.rate 3 10 avgt 15 1795.576 ± 8.351 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.alloc.rate.norm 3 10 avgt 15 26136.002 ± 0.005 B/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Eden_Space 3 10 avgt 15 1796.108 ± 11.527 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Eden_Space.norm 3 10 avgt 15 26143.702 ± 100.832 B/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Survivor_Space 3 10 avgt 15 0.163 ± 0.019 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.churn.PS_Survivor_Space.norm 3 10 avgt 15 2.366 ± 0.270 B/op FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.count 3 10 avgt 15 2134.000 counts FetchRequestBenchmark.testSerializeFetchRequestForConsumer:·gc.time 3 10 avgt 15 1412.000 ms FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.alloc.rate 3 10 avgt 15 1804.695 ± 7.193 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.alloc.rate.norm 3 10 avgt 15 26136.002 ± 0.005 B/op FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Eden_Space 3 10 avgt 15 1805.666 ± 7.990 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Eden_Space.norm 3 10 avgt 15 26150.127 ± 86.455 B/op FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Survivor_Space 3 10 avgt 15 0.166 ± 0.016 MB/sec FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.churn.PS_Survivor_Space.norm 3 10 avgt 15 2.406 ± 0.238 B/op FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.count 3 10 avgt 15 2097.000 counts FetchRequestBenchmark.testSerializeFetchRequestForReplica:·gc.time 3 10 avgt 15 1395.000 ms ``` 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