gitlab: add a new build_unit job to track build size

We want to reduce the total number of build units in the system to get
on our way to a single binary. It will help to have some numbers so
lets add a job to gitlab to track our progress.

Cc: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
Cc: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250304222439.2035603-19-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2025-03-04 22:24:25 +00:00
parent c05aec9d4a
commit 3df360cb03
2 changed files with 88 additions and 0 deletions

66
.gitlab-ci.d/check-units.py Executable file
View file

@ -0,0 +1,66 @@
#!/usr/bin/env python3
#
# check-units.py: check the number of compilation units and identify
# those that are rebuilt multiple times
#
# Copyright (C) 2025 Linaro Ltd.
#
# SPDX-License-Identifier: GPL-2.0-or-later
from os import access, R_OK, path
from sys import argv, exit
import json
from collections import Counter
def extract_build_units(cc_path):
"""
Extract the build units and their counds from compile_commands.json file.
Returns:
Hash table of ["unit"] = count
"""
j = json.load(open(cc_path, 'r'))
files = [f['file'] for f in j]
build_units = Counter(files)
return build_units
def analyse_units(build_units):
"""
Analyse the build units and report stats and the top 10 rebuilds
"""
print(f"Total source files: {len(build_units.keys())}")
print(f"Total build units: {sum(units.values())}")
# Create a sorted list by number of rebuilds
sorted_build_units = sorted(build_units.items(),
key=lambda item: item[1],
reverse=True)
print("Most rebuilt units:")
for unit, count in sorted_build_units[:20]:
print(f" {unit} built {count} times")
print("Least rebuilt units:")
for unit, count in sorted_build_units[-10:]:
print(f" {unit} built {count} times")
if __name__ == "__main__":
if len(argv) != 2:
script_name = path.basename(argv[0])
print(f"Usage: {script_name} <path_to_compile_commands.json>")
exit(1)
cc_path = argv[1]
if path.isfile(cc_path) and access(cc_path, R_OK):
units = extract_build_units(cc_path)
analyse_units(units)
exit(0)
else:
print(f"{cc_path} doesn't exist or isn't readable")
exit(1)

View file

@ -70,3 +70,25 @@ check-rust-tools-nightly:
expire_in: 2 days
paths:
- rust/target/doc
check-build-units:
extends: .base_job_template
stage: build
image: $CI_REGISTRY_IMAGE/qemu/debian:$QEMU_CI_CONTAINER_TAG
needs:
job: amd64-debian-container
before_script:
- source scripts/ci/gitlab-ci-section
- section_start setup "Install Tools"
- apt install --assume-yes --no-install-recommends jq
- section_end setup
script:
- mkdir build
- cd build
- section_start configure "Running configure"
- ../configure
- cd ..
- section_end configure
- section_start analyse "Analyse"
- .gitlab-ci.d/check-units.py build/compile_commands.json
- section_end analyse