how to get number of cores in python
import multiprocessing
multiprocessing.cpu_count() # or os.cpu_count()how to get number of cores in python
import multiprocessing
multiprocessing.cpu_count() # or os.cpu_count()how to know the number of CPu using python
import os
import re
import subprocess
def available_cpu_count():
""" Number of available virtual or physical CPUs on this system, i.e.
user/real as output by time(1) when called with an optimally scaling
userspace-only program"""
# cpuset
# cpuset may restrict the number of *available* processors
try:
m = re.search(r'(?m)^Cpus_allowed:s*(.*)$',
open('/proc/self/status').read())
if m:
res = bin(int(m.group(1).replace(',', ''), 16)).count('1')
if res > 0:
return res
except IOError:
pass
# Python 2.6+
try:
import multiprocessing
return multiprocessing.cpu_count()
except (ImportError, NotImplementedError):
pass
# https://github.com/giampaolo/psutil
try:
import psutil
return psutil.cpu_count() # psutil.NUM_CPUS on old versions
except (ImportError, AttributeError):
pass
# POSIX
try:
res = int(os.sysconf('SC_NPROCESSORS_ONLN'))
if res > 0:
return res
except (AttributeError, ValueError):
pass
# Windows
try:
res = int(os.environ['NUMBER_OF_PROCESSORS'])
if res > 0:
return res
except (KeyError, ValueError):
pass
# jython
try:
from java.lang import Runtime
runtime = Runtime.getRuntime()
res = runtime.availableProcessors()
if res > 0:
return res
except ImportError:
pass
# BSD
try:
sysctl = subprocess.Popen(['sysctl', '-n', 'hw.ncpu'],
stdout=subprocess.PIPE)
scStdout = sysctl.communicate()[0]
res = int(scStdout)
if res > 0:
return res
except (OSError, ValueError):
pass
# Linux
try:
res = open('/proc/cpuinfo').read().count('processort:')
if res > 0:
return res
except IOError:
pass
# Solaris
try:
pseudoDevices = os.listdir('/devices/pseudo/')
res = 0
for pd in pseudoDevices:
if re.match(r'^cpuid@[0-9]+$', pd):
res += 1
if res > 0:
return res
except OSError:
pass
# Other UNIXes (heuristic)
try:
try:
dmesg = open('/var/run/dmesg.boot').read()
except IOError:
dmesgProcess = subprocess.Popen(['dmesg'], stdout=subprocess.PIPE)
dmesg = dmesgProcess.communicate()[0]
res = 0
while 'ncpu' + str(res) + ':' in dmesg:
res += 1
if res > 0:
return res
except OSError:
pass
raise Exception('Can not determine number of CPUs on this system')Copyright © 2021 Codeinu
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