patrickfreed / benchmark-example

This repository contains the sample code included in the Making Slow Rust Code Fast blog post.

Rust Benchmarking Example Code

This repository contains the sample code included in the Making Slow Rust Code Fast blog post.

Setup

1. Clone the mongo-rust-driver repository to the parent directory:

cd .. && git clone https://github.com/mongodb/mongo-rust-driver

2. Start a mongodb instance

mongod --dbpath <some folder> --logpath <some log file> --fork

Note: the folder used for the --dbpath argument needs to be created before starting the mongod instance.

Running the benchmark

cargo bench will run the find benchmark. target/criterion/report will contain the HTML report.

The code for the benchmark is found in benches/find.rs.

Generating a flamegraph

cargo flamegraph -o <filename.svg> --bin benchmark-example will generate a low-noise flamegraph. Be sure to seed the database with data before generating the flamegraph (see the seed_data function).

The code for the application to use for flamegraphs can be found in src/main.rs.