cpuinfo in python 2.4 for windows
How can I get cpuinfo in python 2.4. I want to determine number of processors in a machine. (The code should be OS independent). I have written the code for Linux, but don't know how to make it work for windows.
import subprocess, re
cmd = 'cat /proc/cpuinfo |grep processor |wc'
d = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
lines = d.stdout.readlines()
lines = re.split('\s+', lines[0])
number_of_procs = int(lines[1])
Assuming that I don't have cygwin installed on windows machine, I just have python2.4. Please let me know if there's some module which can be开发者_如何学C called for this purpose, or any help to write the code for this functionality.
Thanks, Sandhya
On python 2.6+:
>>> import multiprocessing
>>> multiprocessing.cpu_count()
2
Update Marked for close because of a duplicate question. See the second answer in How to find out the number of CPUs using python for a way to do it without the multiprocessing module.
Here's on old solution written by Bruce Eckel that should work on all major platforms: http://codeliberates.blogspot.com/2008/05/detecting-cpuscores-in-python.html
def detectCPUs(): """ Detects the number of CPUs on a system. Cribbed from pp. """ # Linux, Unix and MacOS: if hasattr(os, "sysconf"): if os.sysconf_names.has_key("SC_NPROCESSORS_ONLN"): # Linux & Unix: ncpus = os.sysconf("SC_NPROCESSORS_ONLN") if isinstance(ncpus, int) and ncpus > 0: return ncpus else: # OSX: return int(os.popen2("sysctl -n hw.ncpu")[1].read()) # Windows: if os.environ.has_key("NUMBER_OF_PROCESSORS"): ncpus = int(os.environ["NUMBER_OF_PROCESSORS"]); if ncpus > 0: return ncpus return 1 # Default
Well, that will not be cross platform, as you're relying on the /proc filesystem, which is something Windows does not have (although, yes, it would be epically awesome if it did...)
One option is to use a few "if's" to determine the platform type, then for Linux grab your info from /proc/cpuinfo and for Windows grab your info from WMI (Win32_Processor) (http://www.activexperts.com/admin/scripts/wmi/python/0356/)
platform.processor() should be somewhat platform independent though. As the docs say, not all platforms implement it.
http://docs.python.org/library/platform.html
You could use cpuidpy, which uses x86 CPUID instruction to get CPU information.
The purpose is nor conciseness neither compactness, not even elegance ;-), but an attemps to be pedagogic keeping you approach (or whether you get in trouble with the great cpuinfo module), that could be a chunk like:
import re, subprocess, pprint
pp = pprint.PrettyPrinter(indent=2)
cmd = ['cat', '/proc/cpuinfo']
process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
if not stdout:
print('ERROR assessing /proc/cpuinfo')
else:
output = stdout.strip().split("\n")
processors = []
element_regex = re.compile(r'processor\t\:\s\d+')
for item in output:
if element_regex.match(item):
processors.append([])
processors[-1].append(item)
cores = []
for processor in processors:
regex = re.compile('(cpu\scores\t\:\s(\d+)|physical\sid\t\:\s (\d+))')
core = [m.group(1) for item in processor for m in [regex.search(item)] if m]
if core not in cores:
cores.append(core)
pp.pprint(cores)
You should a result as below, when you have one physical CPU with embedding 4 physical cores on your target motherboard:
[['physical id\t: 0', 'cpu cores\t: 4']]
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