workers-rs/benchmark

workers-rs Benchmark Suite

Performance benchmark for workers-rs that measures streaming and parallel sub-request performance.

How to run

First, make sure to clone workers-rs with all submodules.

Then from the root of workers-rs:

npm run build

to build the local worker-build.

Then run the benchmark:

cd benchmark
npm install
npm run bench

What it does

• Streams 1MB of data from /stream endpoint in 8KB chunks
• Makes 10 parallel sub-requests to /stream from /benchmark endpoint
• All requests are internal (no network I/O) to isolate workers-rs performance
• Runs 20 iterations with 3 warmup requests

Output

The benchmark provides:

• Per-iteration timing for Node.js end-to-end and Worker internal execution
• Summary statistics: average, min, and max times
• Data transfer statistics (10MB per iteration = 10 parallel 1MB streams)
• Average throughput in Mbps

Configuration

Adjust parameters in run.mjs:

• iterations - Number of benchmark runs (default: 20)
• Warmup count (default: 3)

Adjust workload in src/lib.rs:

• Number of parallel requests (default: 10)
• Data size per request (default: 1MB)
• Chunk size for streaming (default: 8KB)

Rust Toolchain

rust-toolchain.toml in the root of workers-rs sets the Rust toolchain. Changing this can be used to benchmark against different toolchain versions.

Compatibility Date

The current compaitibility date is set to 2025-11-01 in the wrangler.toml. Finalization registry was enabled as of 2025-05-05, so is included.