Attachment 313693 Details for Bug 449676 – sysfs CPU classes, usage example does random CPU off/onlining

sysfs CPU classes, usage example does random CPU off/onlining

sysfs.py (text/plain), 2.19 KB, created by Arnaldo Carvalho de Melo on 2008-08-07 14:01:48 UTC

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Creator: Arnaldo Carvalho de Melo

Created: 2008-08-07 14:01:48 UTC

Size: 2.19 KB

patch

obsolete

>#! /usr/bin/python
># -*- python -*-
># -*- coding: utf-8 -*-
>
>import os
>
>class cpu:
>	def __init__(self, basedir, name):
>		self.name = name
>		self.dir = "%s/%s" % (basedir, name)
>		self.reload()
>
>	def readfile(self, name):
>		try:
>			f = open("%s/%s" % (self.dir, name))
>			value = f.readline().strip()
>			f.close()
>		except:
>			raise
>		return value
>
>	def reload_online(self):
>		self.online = True
>		try:
>			self.online = self.readfile("online") == "1"
>		except:
>			# boot CPU, usually cpu0, can't be brought offline, so
>			# lacks the file and non root users can't read. In both
>			# cases assume CPU is online.
>			pass
>
>	def reload(self):
>		self.reload_online()
>		if self.online:
>			self.physical_package_id = self.readfile("topology/physical_package_id")
>		else:
>			self.physical_package_id = None
>
>	def set_online(self, online = True):
>		try:
>			f = open("%s/online" % self.dir, "w")
>			f.write("%d\n" % (online and 1 or 0))
>			f.close()
>		except:
>			pass
>
>		self.reload_online()
>		return online == self.online
>
>class cpus:
>	def __init__(self, basedir = "/sys/devices/system/cpu"):
>		self.basedir = basedir
>		self.cpus = {}
>		self.sockets = {}
>		self.reload()
>		self.nr_cpus = len(self.cpus)
>
>	def __getitem__(self, key):
>		return self.cpus[key]
>
>	def keys(self):
>		return self.cpus.keys()
>
>	def has_key(self, key):
>		return self.cpus.has_key(key)
>
>	def reload(self):
>		for name in os.listdir(self.basedir):
>			if name[:3] != "cpu" or not name[3].isdigit():
>				continue
>
>			if name in self.cpus:
>				self.cpus[name].reload(self.basedir)
>			else:
>				c = cpu(self.basedir, name)
>				self.cpus[name] = c
>				socket = c.physical_package_id
>				if socket in self.sockets:
>					self.sockets[socket].insert(0, c)
>				else:
>					self.sockets[socket] = [ c, ]
>
>if __name__ == '__main__':
>	import sys, random, time
>
>	cpus = cpus()
>
>	while True:
>		for socket in cpus.sockets.keys():
>			print "Socket %s" % socket
>			cores = cpus.sockets[socket]
>			random.shuffle(cores)
>			for c in cores:
>				print "  %s" % c.name
>				print "    online: %s" % c.online
>				c.set_online(random.choice([False, True]))
>				print "    online: %s" % c.online
>				sleeptime = random.random() / 2
>				print "sleeping %f seconds..." % sleeptime
>				time.sleep(sleeptime)

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Attachments on bug 449676: 308312 | 308318 | 308373 | 308386 | 308389 | 313693