🏎️ Glychee Benchmark · Simple Gleam Benchmarking on Erlang via Elixir’s Benchee

A simple Gleam benchmark runner which wraps Benchee for the heavy lifting.

Named after Gleam, Benchee and their fruity Lychee offspring:

Requirements

• Requires Gleam 1.0 or later.
• For benchmarking on target JavaScript see https://hex.pm/packages/gleamy_bench, as Glychee only allows benchmarking on target Erlang.
• Glychee is dependency free except for Benchee and Elixir, e.g. it may be used to benchmark Gleam’s stdlib.
• A recent Elixir and Hex must be installed. You might be required to run mix local.hex after installing Elixir.

Quick start

1. Add Glychee to your project: gleam add glychee --dev.

2. Create a custom benchmarking module for example named my_benchmark that contains a main-function. In that module you will define which Functions to benchmark with one or many Data.

3. Run the benchmark:

   gleam clean && \
   gleam build && \
   gleam run -m my_benchmark
   

Full example

If you do not have a Gleam project yet, create it with:

gleam new foobar
cd foobar

To add and run a demo of Glychee:

1. gleam add glychee --dev

2. In your project create a file named src/my_benchmark.gleam with following source code:

   import gleam/int
   import gleam/list
   import glychee/benchmark
   import glychee/configuration
   
   pub fn main() {
     // Configuration is optional
     configuration.initialize()
     configuration.set_pair(configuration.Warmup, 2)
     configuration.set_pair(configuration.Parallel, 2)
     
     // Run the benchmarks
     benchmark.run(
       [
         benchmark.Function(label: "list.sort()", callable: fn(test_data) {
           fn() { list.sort(test_data, int.compare) }
         }),
       ],
       [
         benchmark.Data(label: "pre-sorted list", data: list.range(1, 100_000)),
         benchmark.Data(
           label: "reversed list",
           data: list.range(1, 100_000) |> list.reverse,
         ),
       ],
     )
   }
   

3. Then run in your terminal via:

   gleam clean && \
   gleam build && \
   gleam run -m my_benchmark
   

Now you can alter the functions and data specified in above’s example to whichever function of your application or library you want to benchmark.

Note that you can benchmark multiple functions with different data sets in one go.

Documentation

Glychee’s documentation can be found at https://hexdocs.pm/glychee.