mapleFU commented on PR #35422:
URL: https://github.com/apache/arrow/pull/35422#issuecomment-1540558340
```c++
static void VectorIndex(benchmark::State& state) {
// Code inside this loop is measured repeatedly
std::vector<int64_t> range_vec(10000, 0);
for (auto _ : state) {
// Make sure the variable is not optimized away by compiler
for (int i = 0; i < 10000; ++i) {
int64_t v = range_vec[i];
benchmark::DoNotOptimize(v);
}
}
}
// Register the function as a benchmark
BENCHMARK(VectorIndex);
static void VectorAt(benchmark::State& state) {
// Code inside this loop is measured repeatedly
std::vector<int64_t> range_vec(10000, 0);
for (auto _ : state) {
// Make sure the variable is not optimized away by compiler
for (int i = 0; i < 10000; ++i) {
int64_t v = range_vec.at(i);
benchmark::DoNotOptimize(v);
}
}
}
BENCHMARK(VectorAt);
```
With release(-O2) on my MacOS:
```
------------------------------------------------------
Benchmark Time CPU Iterations
------------------------------------------------------
VectorIndex 24632 ns 17785 ns 38620
VectorAt 37438 ns 31141 ns 21829
```
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