This repository contains a simple benchmark to compare the performance of coverage analysis tools for Rust and C++.

Table of contents

1. Requirements
2. Usage

Requirements

The packaged python script installs all the requirements except gcov, poetry and python 3.12.x which must be installed manually and must be available on Path. The requirements are listed for reference.

1. Rust language framework and tools.

2. GoogleTest. Test framework for C++

3. llvm-cov and Tarpaulin. Coverage tools for Rust.

4. Gcov. Coverage tool for C++.

5. Poetry. Dependency management for Python.

6. Python 3.12.x. Handles scripting.

Usage

1. Use poetry to install script (main.py) dependencies within a virtual environment.

   poetry shell
   poetry install
   

2. Run script within virtual environment setup by poetry to collect coverage for C++ or Rust or both. In the example below, we collect coverage for workloads with 100, 1000 and 10000 tests with each test-suite execution time being averaged over 2 runs for C++ and Rust.

   python main.py --collect-coverage-overhead 100 1000 10000  --average 2
   

3. Output for example given in Step 2

   Execution times in seconds for tests with coverage
   ┌──────────────────┬─────────────────┬─────────────────┬─────────────────┐
   │ #Tests           │ 100             │ 1000            │ 10000           │
   ├──────────────────┼─────────────────┼─────────────────┼─────────────────┤
   │ Rust (llvm-cov)  │ 0.4845 ± 0.0021 │ 1.2965 ± 0.0516 │ 10.611 ± 0.0608 │
   │ Rust (tarpaulin) │ 0.689 ± 0.0198  │ 1.9045 ± 0.0078 │ 15.587 ± 0.0099 │
   │ Cpp (gcov)       │ 0.002 ± 0.0     │ 0.008 ± 0.0     │ 0.0695 ± 0.0007 │
   └──────────────────┴─────────────────┴─────────────────┴─────────────────┘
   
   
   Execution times in seconds for tests without coverage
   ┌──────────┬─────────────────┬─────────────────┬─────────────────┐
   │ #Tests   │ 100             │ 1000            │ 10000           │
   ├──────────┼─────────────────┼─────────────────┼─────────────────┤
   │ Rust     │ 0.2625 ± 0.0191 │ 1.0335 ± 0.0035 │ 9.3525 ± 0.1025 │
   │ Cpp      │ 0.001 ± 0.0     │ 0.006 ± 0.0     │ 0.055 ± 0.0     │
   └──────────┴─────────────────┴─────────────────┴─────────────────┘
   
   
   Coverage overhead as a ratio of execution time with and without coverage
   ┌──────────────────┬───────┬────────┬─────────┐
   │ #Tests           │   100 │   1000 │   10000 │
   ├──────────────────┼───────┼────────┼─────────┤
   │ Rust (llvm-cov)  │  1.85 │   1.25 │    1.13 │
   │ Rust (tarpaulin) │  2.62 │   1.84 │    1.67 │
   │ Cpp (gcov)       │  2    │   1.33 │    1.26 │
   └──────────────────┴───────┴────────┴─────────┘ 
   

4. For more script options

   python main.py --help