conan/tools/build/cpu.py
import math
import multiprocessing
import os
from conans.util.files import load
def build_jobs(conanfile):
njobs = conanfile.conf.get("tools.build:jobs",
default=_cpu_count(),
check_type=int)
return njobs
def _cpu_count():
try:
try:
# This is necessary to deduce docker cpu_count
cfs_quota_us = cfs_period_us = 0
# cgroup2
if os.path.exists("/sys/fs/cgroup/cgroup.controllers"):
cpu_max = load("/sys/fs/cgroup/cpu.max").split()
if cpu_max[0] != "max":
if len(cpu_max) == 1:
cfs_quota_us, cfs_period_us = int(cpu_max[0]), 100_000
else:
cfs_quota_us, cfs_period_us = map(int, cpu_max)
else: # cgroup1
cfs_quota_us = int(load("/sys/fs/cgroup/cpu/cpu.cfs_quota_us"))
cfs_period_us = int(load("/sys/fs/cgroup/cpu/cpu.cfs_period_us"))
if cfs_quota_us > 0 and cfs_period_us > 0:
return int(math.ceil(cfs_quota_us / cfs_period_us))
except (EnvironmentError, TypeError):
pass
return multiprocessing.cpu_count()
except NotImplementedError:
# print("multiprocessing.cpu_count() not implemented. Defaulting to 1 cpu")
return 1 # Safe guess