This contains scripts to run a subset of the pyperformance benchmarks quickly.

Usage

PYTHON_GIL=0 PYTHONHASHSEED=0 taskset -c 4 ./python fastmark.py

Other recommendations

• Disable ALSR to reduce variation: echo 0 | sudo tee /proc/sys/kernel/randomize_va_space
• Use perf stat -e instructions to record instructions executed

Setup

First build CPython locally. It doesn't need to be installed.

Install the dependencies. If Python is executed from the source directory, then this will install the packages in ~/.local/.

./python -m ensurepip
./python -m pip install -r requirements.txt

Gotchas

• Python compiles .pyc files for packages only when they are being installed. If the PYC_MAGIC_NUMBER changes, then Python will recompile the bytecode while the benchmark is running, potentially distorting results. It will not update the .pyc files for packages in site-packages, only local __pycache__ directories.
• Fixing the PYTHONHASHSEED reduces variation but may be inapprorpriate for commits that substantially modify dictionary representation.

Disabled benchmarks

• connected_components, shortest_path - networkx doesn't work with free threaded Python
• django_template, json, pycparser, pylint, thrift - Pyston benchmarks not yet enabled
• sphinx - benchmark messes with __builtins__
• python_startup - requires separate process