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# -*- coding: utf-8 -*-
#!/usr/bin/python -tt
#
# Copyright 2010 David Sommerseth <davids@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# For the avoidance of doubt the "preferred form" of this code is one which
# is in an open unpatent encumbered format. Where cryptographic key signing
# forms part of the process of creating an executable the information
# including keys needed to generate an equivalently functional executable
# are deemed to be part of the source code.
#
import sys, os, libxml2
class CPUtopology:
"Retrieves an overview over the installed CPU cores and the system topology"
def __init__(self, root="/"):
self.sysdir = root + "/sys/devices/system/cpu"
self.__cputop_n = None
self.__cpu_cores = 0
self.__online_cores = 0
self.__cpu_sockets = 0
def __read(self, dirname, fname):
fp = open(os.path.join(self.sysdir, dirname, fname), 'r')
data = fp.readline()
if len(data) > 0:
ret = int(data)
else:
ret = 0
fp.close()
return ret
def parse(self):
"Parses the cpu topology information from /sys/devices/system/cpu/cpu*"
self.__cputop_n = libxml2.newNode('cpu_topology')
cpusockets = []
for dirname in os.listdir(self.sysdir):
# Only parse directories which starts with 'cpu'
if (dirname.find('cpu', 0) == 0) and os.path.isdir(os.path.join(self.sysdir, dirname)):
# Make sure we only parse "proper" cpu<integer> directories, and not f.ex. 'cpuidle'
try:
int(dirname[3:])
except ValueError:
continue
# Parse contents of the cpu dir
for cpudir in os.listdir(os.path.join(self.sysdir, dirname)):
# Check if it is a proper CPU directory which should contain an 'online' file
# except on 'cpu0' which cannot be offline'd
if (cpudir.find('online',0) == 0) or dirname == 'cpu0':
cpu_n = self.__cputop_n.newChild(None,'cpu',None)
cpu_n.newProp('name', dirname)
online = (dirname == 'cpu0') and 1 or self.__read(dirname, 'online')
cpu_n.newProp('online', str(online))
self.__cpu_cores += 1
# Check if the CPU is online, if it is, grab more info available
if online == 1:
self.__online_cores += 1
cpu_n.newProp('core_id',
str(self.__read(os.path.join(dirname, 'topology'), 'core_id')))
phys_pkg_id = self.__read(os.path.join(dirname, 'topology'),
'physical_package_id')
cpu_n.newProp('physical_package_id', str(phys_pkg_id))
cpusockets.append(phys_pkg_id)
break;
# Count unique CPU sockets
lastsock = None
sockcnt = 0
cpusockets.sort()
for sck in cpusockets:
if sck != lastsock:
lastsock = sck
sockcnt += 1
self.__cpu_sockets = sockcnt
# Summarise the core counts
self.__cputop_n.newProp('num_cpu_cores', str(self.__cpu_cores))
self.__cputop_n.newProp('num_cpu_cores_online', str(self.__online_cores))
self.__cputop_n.newProp('num_cpu_sockets', str(self.__cpu_sockets))
return self.__cputop_n
def getXMLdata(self):
return self.__cputop_n
def getCPUcores(self, only_online):
return only_online and self.__online_cores or self.__cpu_cores
def getCPUsockets(self):
return self.__cpu_sockets
def unit_test(rootdir):
try:
cputop = CPUtopology()
n = cputop.parse()
print " ---- XML Result ---- "
x = libxml2.newDoc('1.0')
x.setRootElement(n)
x.saveFormatFileEnc('-','UTF-8',1)
print " ---- getCPUcores() / getCPUscokets() ---- "
print "CPU cores: %i (online: %i) - CPU sockets: %i" % (cputop.getCPUcores(False),
cputop.getCPUcores(True),
cputop.getCPUsockets())
return 0
except Exception, e:
# import traceback
# traceback.print_exc(file=sys.stdout)
print "** EXCEPTION %s", str(e)
return 1
if __name__ == '__main__':
unit_test(None)
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