Persil

Table of Contents

• About
• Getting Started
• Usage

About

Persil is a minimal and simple library for profiling events. It's based on rust's measureme and is just a simple, but powerful layer ontop of measureme.

Getting Started

Prerequisites

• Rust (I don't have any minimun required rust version, just try one of the latest)
• Tools for reading the serialized data. (See here)
• Obviously an application that you want to profile.

Installing

Add this to your Cargo.toml

[dependencies]
persil = "0.1.0"

If you have cargo-edit installed

cargo add persil

Usage

// You have to call `init` at the start of the program,
// with the name of your application.
//
// Your results will be stored in `./trace/{app-name}-{pid}`
persil::init("my_application");

// To store the results in a custom path, use the `init_with_path` function.
persil::init_with_path("./");

// This will enable the profiler.
//
// If you don't call this method, there will be results emitted.
persil::enable();

// `trace` will start tracing an event.
// An event is composed of a `category` and a `label`.
// The `trace` function returns guard, that will stop tracing,
// if it's dropped. 
{
  let _profiler = persil::trace("Parsing", "Expression");
  let expr = parse_expression().unwrap();

  // `_profiler` is dropped here so it will stop tracing
  // at the end of this scope
}

let profiler = persil::trace("Parsing", "Item");
parse_item().unwrap();

// You can also drop the guard manually to stop tracing.
drop(profiler);

Analyze the results

To analye and display the results, you can use one of the tools in the measureme repo.

For example to use summarize, just do:

# if you changed the path to the results, use the new path
summarize trace/my_application

For more information checkout the measureme repository.