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# 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 Library 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# See the COPYING file for license information.
#
# Copyright (c) 2007 Guillaume Chazarain <guichaz@gmail.com>
class VmStat(object):
def __init__(self):
self.vmstat_file = open('/proc/vmstat')
self.vmstat = self.read()
def read(self):
def extract(line):
return int(line.split()[1]) * 1024
for line in self.vmstat_file:
if line.startswith('pgpgin '):
pgpgin = extract(line)
break
for line in self.vmstat_file:
if line.startswith('pgpgout '):
pgpgout = extract(line)
break
self.vmstat_file.seek(0)
return pgpgin, pgpgout
def delta(self):
now = self.read()
delta = now[0] - self.vmstat[0], now[1] - self.vmstat[1]
self.vmstat = now
return delta