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Performance plots for Python code snippets

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perfplot extends Python's timeit by testing snippets with input parameters (e.g., the size of an array) and plotting the results. (By default, perfplot asserts the equality of the output of all snippets, too.)

For example, to compare different NumPy array concatenation methods, the script

import numpy
import perfplot
    setup=lambda n: numpy.random.rand(n),  # or simply setup=numpy.random.rand
        lambda a: numpy.c_[a, a],
        lambda a: numpy.stack([a, a]).T,
        lambda a: numpy.vstack([a, a]).T,
        lambda a: numpy.column_stack([a, a]),
        lambda a: numpy.concatenate([a[:, None], a[:, None]], axis=1),
    labels=["c_", "stack", "vstack", "column_stack", "concat"],
    n_range=[2 ** k for k in range(15)],
    # More optional arguments with their default values:
    # title=None,
    # logx=False,
    # logy=False,
    # equality_check=numpy.allclose,  # set to None to disable "correctness" assertion
    # automatic_order=True,
    # colors=None,
    # target_time_per_measurement=1.0,
    # time_unit="auto"  # set to one of ("s", "ms", "us", or "ns") to force plot units


Clearly, stack and vstack are the best options for large arrays.

Benchmarking and plotting can be separated, too. This allows multiple plots of the same data, for example:

out = perfplot.bench(
    # same arguments as above

Other examples:


perfplot is available from the Python Package Index, so simply do

pip3 install perfplot --user

to install or upgrade.


To run the perfplot unit tests, check out this repository and type



perfplot is published under the MIT license.

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