wjones127 opened a new pull request, #33731:
URL: https://github.com/apache/arrow/pull/33731
### Rationale for this change
We would like to track memory usage in many of our benchmarks. In order to
isolate memory metrics per benchmark, we need to also add a way to reset the
metrics between each benchmark.
### What changes are included in this PR?
* `MemoryPool` now tracks both `num_allocations` and
`total_bytes_allocated`.
* `MemoryPool` exposes a method `ResetStatistics()` that resets all memory
statistics, which is useful for isolating memory changes in a certain region of
code.
* There is now a macro `ARROW_BENCHMARK_TRACK_MEMORY` that can be placed in
a benchmark file to add memory statistics to the google benchmark JSON output.
### Are these changes tested?
* [ ] Add tests
### Are there any user-facing changes?
* [ ] Validate performance impact of new metrics in memory pools.
No breaking changes.
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