Quantum software benchmarking

Benchpress itself requires no installation. However running it requires the tools in requirements.txt. In addition, running each of the frameworks has its own dependencies in the corresponding *-requirements.txt file

With the parameter --timeout-skip-list=<SECs>, a skiplist (a list of tests to skip, given they take too long) is created. For example, the following line runs the tests in benchpress/tket_gym/construct with a 1 hour timeout:

python -m pytest  --timeout-skip-list=3600 benchpress/tket_gym/construct

This will create a skipfile.txt file. The mere existence of this file skips the tests listed there in the following executions. No modifier needed.

To run the benchmarks in the default configuration from inside the environment in which you want to perform the tests run:

python -m pytest benchpress/*_gym

where * is one of the frameworks that you want to test, and which matches the environment you are in.

To run the benchmarks and save to JSON one can do:

python -m pytest --benchmark-save=SAVED_NAME  benchpress/*_gym

which will save the file to the CWD in the .benchmarks folder

Further details on using pytest-benchmark can be found here: https://pytest-benchmark.readthedocs.io/en/latest/usage.html

Benchmarking the amount of memory a test uses can be very costly in terms of time and memory. Here we use the pytest-memray plugin. Calling the memory bechmark looks like:

python -m pytest --memray --trace-python-allocators --native --most-allocations=100 --benchmark-disable benchpress/*_gym

Here --memray turns on the memory profiler, --trace-python-allocators tracks all the memoryu allocations from Python, --native track C/C++/Rust memory, --most-allocations=N shows only the top N tests in terms of memory consuption, and finally --benchmark-disable turns off the timing benchmarks.

The pytest-memray plugin will sometimes raise on building the histrogram included in the report by default. Currently the only way around this error, which does not affect the tests, is to manually comment out L322 and L323 from the plugin.py file:

#histogram_txt = cli_hist(sizes, bins=min(len(sizes), N_HISTOGRAM_BINS))
#writeln(f"\t 📊 Histogram of allocation sizes: |{histogram_txt}|")

We have designed Benchpress in a manor to allow all tests to be executed on each SDK, regardless of whether that functionality is supported or not. This is facilitated by the use of "workouts" that define abstract base classes that define each set of tests. This design choice has the advantage of explicitly measuring the breadth of SDK functionality

In Benchpress each test status has a well defined meaning:

• PASSED - Indicates that the SDK has the functionality required to run the test, and doing so completed without error, and within the desired time-limit.

• SKIPPED - The SDK does not have the required functionality to execute the test. This is the default for all tests defined in the workouts.

• FAILED - The SDK has the necessary functionality, but the test failed or the test did not complete within the set time-limit.

• XFAIL - The test fails in an irrecoverable manner, and is therefore tagged as failed rather than being executed. E.g. the test tries to use more memory than is available.

Benchpress makes use of files from the following open-source packages under terms of their licenses. License files are included in the corresponding directories.

• Feynman

• QasmBench

Apache License 2.0