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

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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.

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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

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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

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You could use cpuidpy, which uses x86 CPUID instruction to get CPU information.

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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']]