pybench-empty

Overview

`pybench-empty` is a shell script designed to run a specific Python benchmarking test suite using `pytest` with the `pytest-benchmark` plugin. The script executes benchmarks defined in the file `bench/benchmark_empty.py`, focusing on the benchmark tests related to `orjson`. It configures various benchmarking options to control the runtime, garbage collection behavior, and result saving, while also randomizing the test order and enabling verbose output.

This file acts as a convenience wrapper to standardize and simplify running the benchmark tests with consistent parameters, ensuring reproducibility and ease of use for developers and continuous integration (CI) systems.

Detailed Explanation

Script Type

• Language: Bash shell script

• Purpose: Invoke pytest with specific benchmarking options

Script Content Breakdown

#!/usr/bin/env bash

• Uses the environment's default Bash interpreter to execute the script.

set -eou pipefail

• -e: Exit immediately if a command exits with a non-zero status.

• -o pipefail: Causes a pipeline to return the exit status of the last command to exit with a non-zero status, or zero if all succeed.

• -u: Treat unset variables as an error and exit immediately.

This combination ensures robust error handling and prevents silent failures.

pytest Command and Options

pytest \
    --verbose \
    --benchmark-min-time=1 \
    --benchmark-max-time=5 \
    --benchmark-disable-gc \
    --benchmark-autosave \
    --benchmark-save-data \
    --random-order \
    -k orjson \
    "bench/benchmark_empty.py"

• pytest: The Python testing tool used to run tests.

• --verbose: Increases verbosity to show detailed test results.

• --benchmark-min-time=1: Minimum time in seconds each benchmark should run.

• --benchmark-max-time=5: Maximum time in seconds allowed for each benchmark.

• --benchmark-disable-gc: Disables Python's garbage collection during benchmarking to reduce noise.

• --benchmark-autosave: Automatically saves benchmark results after the run.

• --benchmark-save-data: Saves detailed benchmark data to a file.

• --random-order: Randomizes the order of test execution to detect order dependencies.

• -k orjson: Filters tests to only those whose names match orjson.

• "bench/benchmark_empty.py": The benchmark test file to run.

Parameters Summary

Usage Example

To run the benchmark tests related to `orjson` with the configured options, simply execute the script from the command line:

./pybench-empty

This will invoke `pytest` with the specified parameters and run the benchmarks defined in `bench/benchmark_empty.py`.

Implementation Details and Algorithms

This file does not contain any algorithms or complex logic; it is a straightforward Bash script that sets strict error handling and runs `pytest` with specific benchmarking parameters. The key focus is on:

• Ensuring consistent benchmarking configuration.

• Disabling garbage collection to reduce noise in performance measurements.

• Running benchmarks for controlled durations to balance accuracy and time consumption.

• Randomizing test order to reveal inter-test dependencies.

• Filtering tests to only those related to orjson.

• Saving benchmark results automatically for later analysis.

Interaction with Other System Components

• pytest framework: The script depends on pytest as the test runner.

• pytest-benchmark plugin: The benchmarking options require the pytest-benchmark plugin to be installed and active.

• bench/benchmark_empty.py: This file contains the actual benchmark tests. The script targets this specific file.

• Benchmark Data Storage: By enabling autosave and saving data, the script causes benchmark results to be saved in the default location (usually a .benchmarks directory or cache).

• Test Filtering: The -k orjson option means it runs only benchmarks related to orjson, which suggests bench/benchmark_empty.py contains multiple benchmarks, and this script focuses on a subset.

Diagram: Flowchart of Script Execution and Benchmarking Workflow

flowchart TD
    Start["Start: Execute pybench-empty script"]
    SetOpts["Set Bash options: -eou pipefail"]
    RunPytest["Run pytest with options:\n- verbose\n- benchmark min/max time\n- disable gc\n- autosave\n- save data\n- random order\n- filter 'orjson'\n- target bench/benchmark_empty.py"]
    PytestExec["pytest executes benchmark tests in bench/benchmark_empty.py matching 'orjson'"]
    Benchmarking["Benchmarking process:\n- Run each test for 1-5 seconds\n- Disable GC\n- Randomized order"]
    SaveResults["Autosave benchmark results and data"]
    End["End: Benchmark tests complete"]

    Start --> SetOpts --> RunPytest --> PytestExec --> Benchmarking --> SaveResults --> End

Summary

• pybench-empty is a utility Bash script to run pytest benchmarks with controlled parameters.

• It focuses on the orjson benchmarks inside bench/benchmark_empty.py.

• Ensures reliable benchmarking by disabling GC and controlling execution time.

• Automatically saves results for later review.

• Designed for ease of use, reproducibility, and integration into CI pipelines or developer workflows.

This file plays a key role in consistently running and collecting performance metrics for the specified benchmarks, supporting performance regression detection and optimization efforts in the project.