iotop/vmstat.py

   1 # This program is free software; you can redistribute it and/or modify
   2 # it under the terms of the GNU General Public License as published by
   3 # the Free Software Foundation; either version 2 of the License, or
   4 # (at your option) any later version.
   5 #
   6 # This program is distributed in the hope that it will be useful,
   7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 # GNU Library General Public License for more details.
  10 #
  11 # You should have received a copy of the GNU General Public License
  12 # along with this program; if not, write to the Free Software
  13 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  14 #
  15 # See the COPYING file for license information.
  16 #
  17 # Copyright (c) 2007 Guillaume Chazarain <guichaz@gmail.com>
  18
  19 class VmStat(object):
  20     def __init__(self):
  21         self.vmstat_file = open('/proc/vmstat')
  22         self.vmstat = self.read()
  23
  24     def read(self):
  25         def extract(line):
  26             return int(line.split()[1]) * 1024
  27
  28         for line in self.vmstat_file:
  29             if line.startswith('pgpgin '):
  30                 pgpgin = extract(line)
  31                 break
  32
  33         for line in self.vmstat_file:
  34             if line.startswith('pgpgout '):
  35                 pgpgout = extract(line)
  36                 break
  37
  38         self.vmstat_file.seek(0)
  39         return pgpgin, pgpgout
  40
  41     def delta(self):
  42         now = self.read()
  43         delta = now[0] - self.vmstat[0], now[1] - self.vmstat[1]
  44         self.vmstat = now
  45         return delta
  46