/usr/lib/python3/dist-packages/glances/plugins/glances_diskio.py is in glances 2.11.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This file is part of Glances.
#
# Copyright (C) 2017 Nicolargo <nicolas@nicolargo.com>
#
# Glances is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Glances 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Disk I/O plugin."""
import operator
from glances.timer import getTimeSinceLastUpdate
from glances.plugins.glances_plugin import GlancesPlugin
import psutil
# Define the history items list
# All items in this list will be historised if the --enable-history tag is set
# 'color' define the graph color in #RGB format
items_history_list = [{'name': 'read_bytes',
'description': 'Bytes read per second',
'color': '#00FF00',
'y_unit': 'B/s'},
{'name': 'write_bytes',
'description': 'Bytes write per second',
'color': '#FF0000',
'y_unit': 'B/s'}]
class Plugin(GlancesPlugin):
"""Glances disks I/O plugin.
stats is a list
"""
def __init__(self, args=None):
"""Init the plugin."""
super(Plugin, self).__init__(args=args, items_history_list=items_history_list)
# We want to display the stat in the curse interface
self.display_curse = True
# Init the stats
self.reset()
def get_key(self):
"""Return the key of the list."""
return 'disk_name'
def reset(self):
"""Reset/init the stats."""
self.stats = []
@GlancesPlugin._check_decorator
@GlancesPlugin._log_result_decorator
def update(self):
"""Update disk I/O stats using the input method."""
# Reset stats
self.reset()
if self.input_method == 'local':
# Update stats using the standard system lib
# Grab the stat using the PsUtil disk_io_counters method
# read_count: number of reads
# write_count: number of writes
# read_bytes: number of bytes read
# write_bytes: number of bytes written
# read_time: time spent reading from disk (in milliseconds)
# write_time: time spent writing to disk (in milliseconds)
try:
diskiocounters = psutil.disk_io_counters(perdisk=True)
except Exception:
return self.stats
# Previous disk IO stats are stored in the diskio_old variable
if not hasattr(self, 'diskio_old'):
# First call, we init the diskio_old var
try:
self.diskio_old = diskiocounters
except (IOError, UnboundLocalError):
pass
else:
# By storing time data we enable Rx/s and Tx/s calculations in the
# XML/RPC API, which would otherwise be overly difficult work
# for users of the API
time_since_update = getTimeSinceLastUpdate('disk')
diskio_new = diskiocounters
for disk in diskio_new:
# By default, RamFS is not displayed (issue #714)
if self.args is not None and not self.args.diskio_show_ramfs and disk.startswith('ram'):
continue
# Do not take hide disk into account
if self.is_hide(disk):
continue
# Compute count and bit rate
try:
read_count = (diskio_new[disk].read_count -
self.diskio_old[disk].read_count)
write_count = (diskio_new[disk].write_count -
self.diskio_old[disk].write_count)
read_bytes = (diskio_new[disk].read_bytes -
self.diskio_old[disk].read_bytes)
write_bytes = (diskio_new[disk].write_bytes -
self.diskio_old[disk].write_bytes)
diskstat = {
'time_since_update': time_since_update,
'disk_name': disk,
'read_count': read_count,
'write_count': write_count,
'read_bytes': read_bytes,
'write_bytes': write_bytes}
# Add alias if exist (define in the configuration file)
if self.has_alias(disk) is not None:
diskstat['alias'] = self.has_alias(disk)
except KeyError:
continue
else:
diskstat['key'] = self.get_key()
self.stats.append(diskstat)
# Save stats to compute next bitrate
self.diskio_old = diskio_new
elif self.input_method == 'snmp':
# Update stats using SNMP
# No standard way for the moment...
pass
return self.stats
def update_views(self):
"""Update stats views."""
# Call the father's method
super(Plugin, self).update_views()
# Add specifics informations
# Alert
for i in self.stats:
disk_real_name = i['disk_name']
self.views[i[self.get_key()]]['read_bytes']['decoration'] = self.get_alert(int(i['read_bytes'] // i['time_since_update']),
header=disk_real_name + '_rx')
self.views[i[self.get_key()]]['write_bytes']['decoration'] = self.get_alert(int(i['write_bytes'] // i['time_since_update']),
header=disk_real_name + '_tx')
def msg_curse(self, args=None):
"""Return the dict to display in the curse interface."""
# Init the return message
ret = []
# Only process if stats exist and display plugin enable...
if not self.stats or self.is_disable():
return ret
# Build the string message
# Header
msg = '{:9}'.format('DISK I/O')
ret.append(self.curse_add_line(msg, "TITLE"))
if args.diskio_iops:
msg = '{:>7}'.format('IOR/s')
ret.append(self.curse_add_line(msg))
msg = '{:>7}'.format('IOW/s')
ret.append(self.curse_add_line(msg))
else:
msg = '{:>7}'.format('R/s')
ret.append(self.curse_add_line(msg))
msg = '{:>7}'.format('W/s')
ret.append(self.curse_add_line(msg))
# Disk list (sorted by name)
for i in sorted(self.stats, key=operator.itemgetter(self.get_key())):
# Is there an alias for the disk name ?
disk_real_name = i['disk_name']
disk_name = self.has_alias(i['disk_name'])
if disk_name is None:
disk_name = disk_real_name
# New line
ret.append(self.curse_new_line())
if len(disk_name) > 9:
# Cut disk name if it is too long
disk_name = '_' + disk_name[-8:]
msg = '{:9}'.format(disk_name)
ret.append(self.curse_add_line(msg))
if args.diskio_iops:
# count
txps = self.auto_unit(
int(i['read_count'] // i['time_since_update']))
rxps = self.auto_unit(
int(i['write_count'] // i['time_since_update']))
msg = '{:>7}'.format(txps)
ret.append(self.curse_add_line(msg,
self.get_views(item=i[self.get_key()],
key='read_count',
option='decoration')))
msg = '{:>7}'.format(rxps)
ret.append(self.curse_add_line(msg,
self.get_views(item=i[self.get_key()],
key='write_count',
option='decoration')))
else:
# Bitrate
txps = self.auto_unit(
int(i['read_bytes'] // i['time_since_update']))
rxps = self.auto_unit(
int(i['write_bytes'] // i['time_since_update']))
msg = '{:>7}'.format(txps)
ret.append(self.curse_add_line(msg,
self.get_views(item=i[self.get_key()],
key='read_bytes',
option='decoration')))
msg = '{:>7}'.format(rxps)
ret.append(self.curse_add_line(msg,
self.get_views(item=i[self.get_key()],
key='write_bytes',
option='decoration')))
return ret
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