Benchmarking NumPy with Airspeed Velocity.
Airspeed Velocity manages building and Python virtualenvs by itself,
unless told otherwise. Some of the benchmarking features in
runtests.py also tell ASV to use the NumPy compiled by
runtests.py. To run the benchmarks, you do not need to install a
development version of NumPy to your current Python environment.
Before beginning, ensure that airspeed velocity is installed. By default, asv ships with support for anaconda and virtualenv:
pip install asv pip install virtualenv
After contributing new benchmarks, you should test them locally before submitting a pull request.
To run all benchmarks, navigate to the root NumPy directory at the command line and execute:
python runtests.py --bench
--bench activates the benchmark suite instead of the
test suite. This builds NumPy and runs all available benchmarks
benchmarks/. (Note: this could take a while. Each
benchmark is run multiple times to measure the distribution in
To run benchmarks from a particular benchmark module, such as
bench_core.py, simply append the filename without the extension:
python runtests.py --bench bench_core
To run a benchmark defined in a class, such as
python runtests.py --bench bench_avx.Mandelbrot
Compare change in benchmark results to another version/commit/branch:
python runtests.py --bench-compare v1.6.2 bench_core python runtests.py --bench-compare 8bf4e9b bench_core python runtests.py --bench-compare master bench_core
All of the commands above display the results in plain text in the console, and the results are not saved for comparison with future commits. For greater control, a graphical view, and to have results saved for future comparison you can run ASV commands (record results and generate HTML):
cd benchmarks asv run -n -e --python=same asv publish asv preview
More on how to use
asv can be found in ASV documentation
Command-line help is available as usual via
asv --help and
asv run --help.
See ASV documentation for basics on how to write benchmarks.
Some things to consider:
The benchmark suite should be importable with any NumPy version.
The benchmark parameters etc. should not depend on which NumPy version is installed.
Try to keep the runtime of the benchmark reasonable.
time_methods for benchmarking times rather than cooking up time measurements via
time.clock, even if it requires some juggling when writing the benchmark.
Preparing arrays etc. should generally be put in the
setupmethod rather than the
time_methods, to avoid counting preparation time together with the time of the benchmarked operation.
Be mindful that large arrays created with
np.zerosmight not be allocated in physical memory until the memory is accessed. If this is desired behaviour, make sure to comment it in your setup function. If you are benchmarking an algorithm, it is unlikely that a user will be executing said algorithm on a newly created empty/zero array. One can force pagefaults to occur in the setup phase either by calling
arr.fill(value)after creating the array,