● Covered by 1 source · 1 reportLow impact1 neutral
benchfmt.rs Brings Go's Benchmarking Workflow and benchstat Compatibility to Rust
Key points
- benchfmt.rs is a Rust benchmark runner compatible with Go's benchstat.
- Adds heap allocation tracking (B/op, allocs/op) and pprof profiling.
- Includes a converter for Criterion and libtest to Go's benchfmt format.
- Aims to improve Rust A/B microbenchmarking and Go vs. Rust comparisons.
Introducing benchfmt.rs
benchfmt.rs is a newly released zero-dependency Rust benchmark runner designed to integrate Rust benchmarking with Go's benchstat workflow. It provides a familiar interface for developers accustomed to Go's performance testing tools, addressing perceived gaps in Rust's standard benchmarking ecosystem.
Key Features and Capabilities
The tool introduces several features to Rust benchmarking, including key-value projections for case comparison, heap allocation measurements (bytes per operation and allocations per operation), and pprof profiling support. It also offers a simple reliability scoring mechanism. For those preferring existing Rust tools, benchfmt.rs includes a converter for Criterion and libtest outputs into Go's benchfmt format.
Motivation and Background
The developer, experienced in performance-sensitive Go projects like Prometheus and Thanos, noted that Rust's standard benchmarking tools lacked features common in the Go ecosystem, such as a standard format for comparisons, heap allocation metrics, and pprof support. The goal was to enable benchstat-compatible output for Rust microbenchmarks to facilitate A/B testing and Go vs. Rust performance comparisons.
Practical Application
To demonstrate its utility, the developer used benchfmt.rs to benchmark varint and Prometheus Remote Write 2.0 decoding across both Go and Rust implementations. This practical application showcases how the tool can be used to compare performance between the two languages and different Rust benchmarking frameworks.
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Primary sources
GitHub bwplotka/benchfmt.rs GitHub prometheus/expfmt-rs GitHub bwplotka/benchmarks GitHub golang/snappy GitHub planetscale/vtprotobuf GitHub google/pprofReporting from
benchfmt.rs is a new zero-dependency Rust benchmark runner and Criterion converter that produces output compatible with Go's benchstat tool. It adds features like key-value projections, heap tracking for allocated bytes and objects, and pprof profiling to Rust benchmarking. This tool aims to simplify A/B microbenchmarking in Rust and enable direct comparisons with Go performance.