gortiz commented on PR #12354:
URL: https://github.com/apache/pinot/pull/12354#issuecomment-1964199109
Extra investigations:
## Why performance in `normal` with `null handling` decreases so much when
going from 2 to 4 interval?
I've checked with perfnorm:
```
Benchmark (_impl)
(_nullHandlingEnabled) (_nullInterval) Mode Cnt Score Error
Units
BenchmarkSumAggregation2.test normal
true 2 thrpt 5 103.386 ± 3.852 ops/ms
BenchmarkSumAggregation2.test:CPI normal
true 2 thrpt 0.177 clks/insn
BenchmarkSumAggregation2.test:IPC normal
true 2 thrpt 5.660 insns/clk
BenchmarkSumAggregation2.test:L1-dcache-load-misses normal
true 2 thrpt 1321.767 #/op
BenchmarkSumAggregation2.test:L1-dcache-loads normal
true 2 thrpt 15314.726 #/op
BenchmarkSumAggregation2.test:L1-icache-load-misses normal
true 2 thrpt 1.106 #/op
BenchmarkSumAggregation2.test:L1-icache-loads normal
true 2 thrpt 329.697 #/op
BenchmarkSumAggregation2.test:branch-misses normal
true 2 thrpt 8.702 #/op
BenchmarkSumAggregation2.test:branches normal
true 2 thrpt 60461.749 #/op
BenchmarkSumAggregation2.test:cycles normal
true 2 thrpt 41090.010 #/op
BenchmarkSumAggregation2.test:dTLB-load-misses normal
true 2 thrpt 0.301 #/op
BenchmarkSumAggregation2.test:dTLB-loads normal
true 2 thrpt 2.005 #/op
BenchmarkSumAggregation2.test:iTLB-load-misses normal
true 2 thrpt 0.048 #/op
BenchmarkSumAggregation2.test:iTLB-loads normal
true 2 thrpt 0.219 #/op
BenchmarkSumAggregation2.test:instructions normal
true 2 thrpt 232553.341 #/op
BenchmarkSumAggregation2.test:stalled-cycles-backend normal
true 2 thrpt 25474.941 #/op
BenchmarkSumAggregation2.test:stalled-cycles-frontend normal
true 2 thrpt 57.691 #/op
BenchmarkSumAggregation2.test normal
true 4 thrpt 5 3.525 ± 0.129 ops/ms
BenchmarkSumAggregation2.test:CPI normal
true 4 thrpt 0.378 clks/insn
BenchmarkSumAggregation2.test:IPC normal
true 4 thrpt 2.645 insns/clk
BenchmarkSumAggregation2.test:L1-dcache-load-misses normal
true 4 thrpt 1689.903 #/op
BenchmarkSumAggregation2.test:L1-dcache-loads normal
true 4 thrpt 685807.174 #/op
BenchmarkSumAggregation2.test:L1-icache-load-misses normal
true 4 thrpt 21.785 #/op
BenchmarkSumAggregation2.test:L1-icache-loads normal
true 4 thrpt 10603.011 #/op
BenchmarkSumAggregation2.test:branch-misses normal
true 4 thrpt 15379.544 #/op
BenchmarkSumAggregation2.test:branches normal
true 4 thrpt 817946.383 #/op
BenchmarkSumAggregation2.test:cycles normal
true 4 thrpt 1223502.258 #/op
BenchmarkSumAggregation2.test:dTLB-load-misses normal
true 4 thrpt 2.123 #/op
BenchmarkSumAggregation2.test:dTLB-loads normal
true 4 thrpt 16.638 #/op
BenchmarkSumAggregation2.test:iTLB-load-misses normal
true 4 thrpt 0.639 #/op
BenchmarkSumAggregation2.test:iTLB-loads normal
true 4 thrpt 2.910 #/op
BenchmarkSumAggregation2.test:instructions normal
true 4 thrpt 3236651.002 #/op
BenchmarkSumAggregation2.test:stalled-cycles-backend normal
true 4 thrpt 116767.982 #/op
BenchmarkSumAggregation2.test:stalled-cycles-frontend normal
true 4 thrpt 17092.450 #/op
```
AFAIU there are far more cache failures and mispredictions.
## Why performance in `foldDouble` with `null handling` increases so much
when going from 4 to 8 interval?
Same reason:
```
BenchmarkSumAggregation2.test foldDouble
true 4 thrpt 5 68.321 ± 0.344 ops/ms
BenchmarkSumAggregation2.test:CPI foldDouble
true 4 thrpt 0.234 clks/insn
BenchmarkSumAggregation2.test:IPC foldDouble
true 4 thrpt 4.264 insns/clk
BenchmarkSumAggregation2.test:L1-dcache-load-misses foldDouble
true 4 thrpt 2382.564 #/op
BenchmarkSumAggregation2.test:L1-dcache-loads foldDouble
true 4 thrpt 103018.730 #/op
BenchmarkSumAggregation2.test:L1-icache-load-misses foldDouble
true 4 thrpt 4.476 #/op
BenchmarkSumAggregation2.test:L1-icache-loads foldDouble
true 4 thrpt 402.647 #/op
BenchmarkSumAggregation2.test:branch-misses foldDouble
true 4 thrpt 5.758 #/op
BenchmarkSumAggregation2.test:branches foldDouble
true 4 thrpt 41678.023 #/op
BenchmarkSumAggregation2.test:cycles foldDouble
true 4 thrpt 64669.720 #/op
BenchmarkSumAggregation2.test:dTLB-load-misses foldDouble
true 4 thrpt 15.780 #/op
BenchmarkSumAggregation2.test:dTLB-loads foldDouble
true 4 thrpt 21.655 #/op
BenchmarkSumAggregation2.test:iTLB-load-misses foldDouble
true 4 thrpt 0.501 #/op
BenchmarkSumAggregation2.test:iTLB-loads foldDouble
true 4 thrpt 0.600 #/op
BenchmarkSumAggregation2.test:instructions foldDouble
true 4 thrpt 275779.218 #/op
BenchmarkSumAggregation2.test:stalled-cycles-backend foldDouble
true 4 thrpt 37349.094 #/op
BenchmarkSumAggregation2.test:stalled-cycles-frontend foldDouble
true 4 thrpt 700.245 #/op
BenchmarkSumAggregation2.test foldDouble
true 8 thrpt 5 120.523 ± 1.062 ops/ms
BenchmarkSumAggregation2.test:CPI foldDouble
true 8 thrpt 0.233 clks/insn
BenchmarkSumAggregation2.test:IPC foldDouble
true 8 thrpt 4.293 insns/clk
BenchmarkSumAggregation2.test:L1-dcache-load-misses foldDouble
true 8 thrpt 1838.574 #/op
BenchmarkSumAggregation2.test:L1-dcache-loads foldDouble
true 8 thrpt 56420.620 #/op
BenchmarkSumAggregation2.test:L1-icache-load-misses foldDouble
true 8 thrpt 1.978 #/op
BenchmarkSumAggregation2.test:L1-icache-loads foldDouble
true 8 thrpt 217.917 #/op
BenchmarkSumAggregation2.test:branch-misses foldDouble
true 8 thrpt 2.651 #/op
BenchmarkSumAggregation2.test:branches foldDouble
true 8 thrpt 21608.391 #/op
BenchmarkSumAggregation2.test:cycles foldDouble
true 8 thrpt 34548.798 #/op
BenchmarkSumAggregation2.test:dTLB-load-misses foldDouble
true 8 thrpt 8.186 #/op
BenchmarkSumAggregation2.test:dTLB-loads foldDouble
true 8 thrpt 10.305 #/op
BenchmarkSumAggregation2.test:iTLB-load-misses foldDouble
true 8 thrpt 0.277 #/op
BenchmarkSumAggregation2.test:iTLB-loads foldDouble
true 8 thrpt 0.263 #/op
BenchmarkSumAggregation2.test:instructions foldDouble
true 8 thrpt 148330.222 #/op
BenchmarkSumAggregation2.test:stalled-cycles-backend foldDouble
true 8 thrpt 21706.154 #/op
BenchmarkSumAggregation2.test:stalled-cycles-frontend foldDouble
true 8 thrpt 302.209 #/op
```
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