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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
"""Virtual memory plugin."""
from glances.compat import iterkeys
from glances.plugins.glances_plugin import GlancesPlugin
import psutil
# Fields description
fields_description = {
'total': {'description': 'Total physical memory available.', 'unit': 'bytes', 'min_symbol': 'K'},
'available': {
'description': 'The actual amount of available memory that can be given instantly \
to processes that request more memory in bytes; this is calculated by summing \
different memory values depending on the platform (e.g. free + buffers + cached on Linux) \
and it is supposed to be used to monitor actual memory usage in a cross platform fashion.',
'unit': 'bytes',
'min_symbol': 'K',
},
'percent': {
'description': 'The percentage usage calculated as (total - available) / total * 100.',
'unit': 'percent',
},
'used': {
'description': 'Memory used, calculated differently depending on the platform and \
designed for informational purposes only.',
'unit': 'bytes',
'min_symbol': 'K',
},
'free': {
'description': 'Memory not being used at all (zeroed) that is readily available; \
note that this doesn\'t reflect the actual memory available (use \'available\' instead).',
'unit': 'bytes',
'min_symbol': 'K',
},
'active': {
'description': '*(UNIX)*: memory currently in use or very recently used, and so it is in RAM.',
'unit': 'bytes',
'min_symbol': 'K',
},
'inactive': {
'description': '*(UNIX)*: memory that is marked as not used.',
'unit': 'bytes',
'min_symbol': 'K',
'short_name': 'inacti',
},
'buffers': {
'description': '*(Linux, BSD)*: cache for things like file system metadata.',
'unit': 'bytes',
'min_symbol': 'K',
'short_name': 'buffer',
},
'cached': {'description': '*(Linux, BSD)*: cache for various things.', 'unit': 'bytes', 'min_symbol': 'K'},
'wired': {
'description': '*(BSD, macOS)*: memory that is marked to always stay in RAM. It is never moved to disk.',
'unit': 'bytes',
'min_symbol': 'K',
},
'shared': {
'description': '*(BSD)*: memory that may be simultaneously accessed by multiple processes.',
'unit': 'bytes',
'min_symbol': 'K',
},
}
# SNMP OID
# Total RAM in machine: .1.3.6.1.4.1.2021.4.5.0
# Total RAM used: .1.3.6.1.4.1.2021.4.6.0
# Total RAM Free: .1.3.6.1.4.1.2021.4.11.0
# Total RAM Shared: .1.3.6.1.4.1.2021.4.13.0
# Total RAM Buffered: .1.3.6.1.4.1.2021.4.14.0
# Total Cached Memory: .1.3.6.1.4.1.2021.4.15.0
# Note: For Windows, stats are in the FS table
snmp_oid = {
'default': {
'total': '1.3.6.1.4.1.2021.4.5.0',
'free': '1.3.6.1.4.1.2021.4.11.0',
'shared': '1.3.6.1.4.1.2021.4.13.0',
'buffers': '1.3.6.1.4.1.2021.4.14.0',
'cached': '1.3.6.1.4.1.2021.4.15.0',
},
'windows': {
'mnt_point': '1.3.6.1.2.1.25.2.3.1.3',
'alloc_unit': '1.3.6.1.2.1.25.2.3.1.4',
'size': '1.3.6.1.2.1.25.2.3.1.5',
'used': '1.3.6.1.2.1.25.2.3.1.6',
},
'esxi': {
'mnt_point': '1.3.6.1.2.1.25.2.3.1.3',
'alloc_unit': '1.3.6.1.2.1.25.2.3.1.4',
'size': '1.3.6.1.2.1.25.2.3.1.5',
'used': '1.3.6.1.2.1.25.2.3.1.6',
},
}
# Define the history items list
# All items in this list will be historised if the --enable-history tag is set
items_history_list = [{'name': 'percent', 'description': 'RAM memory usage', 'y_unit': '%'}]
class Plugin(GlancesPlugin):
"""Glances' memory plugin.
stats is a dict
"""
def __init__(self, args=None, config=None):
"""Init the plugin."""
super(Plugin, self).__init__(
args=args, config=config, items_history_list=items_history_list, fields_description=fields_description
)
# We want to display the stat in the curse interface
self.display_curse = True
@GlancesPlugin._check_decorator
@GlancesPlugin._log_result_decorator
def update(self):
"""Update RAM memory stats using the input method."""
# Init new stats
stats = self.get_init_value()
if self.input_method == 'local':
# Update stats using the standard system lib
# Grab MEM using the psutil virtual_memory method
vm_stats = psutil.virtual_memory()
# Get all the memory stats (copy/paste of the psutil documentation)
# total: total physical memory available.
# available: the actual amount of available memory that can be given instantly
# to processes that request more memory in bytes; this is calculated by summing
# different memory values depending on the platform (e.g. free + buffers + cached on Linux)
# and it is supposed to be used to monitor actual memory usage in a cross platform fashion.
# percent: the percentage usage calculated as (total - available) / total * 100.
# used: memory used, calculated differently depending on the platform and designed for informational
# purposes only.
# free: memory not being used at all (zeroed) that is readily available; note that this doesn't
# reflect the actual memory available (use ‘available’ instead).
# Platform-specific fields:
# active: (UNIX): memory currently in use or very recently used, and so it is in RAM.
# inactive: (UNIX): memory that is marked as not used.
# buffers: (Linux, BSD): cache for things like file system metadata.
# cached: (Linux, BSD): cache for various things.
# wired: (BSD, macOS): memory that is marked to always stay in RAM. It is never moved to disk.
# shared: (BSD): memory that may be simultaneously accessed by multiple processes.
self.reset()
for mem in [
'total',
'available',
'percent',
'used',
'free',
'active',
'inactive',
'buffers',
'cached',
'wired',
'shared',
]:
if hasattr(vm_stats, mem):
stats[mem] = getattr(vm_stats, mem)
# Use the 'free'/htop calculation
# free=available+buffer+cached
stats['free'] = stats['available']
if hasattr(stats, 'buffers'):
stats['free'] += stats['buffers']
if hasattr(stats, 'cached'):
stats['free'] += stats['cached']
# used=total-free
stats['used'] = stats['total'] - stats['free']
elif self.input_method == 'snmp':
# Update stats using SNMP
if self.short_system_name in ('windows', 'esxi'):
# Mem stats for Windows|Vmware Esxi are stored in the FS table
try:
fs_stat = self.get_stats_snmp(snmp_oid=snmp_oid[self.short_system_name], bulk=True)
except KeyError:
self.reset()
else:
for fs in fs_stat:
# The Physical Memory (Windows) or Real Memory (VMware)
# gives statistics on RAM usage and availability.
if fs in ('Physical Memory', 'Real Memory'):
stats['total'] = int(fs_stat[fs]['size']) * int(fs_stat[fs]['alloc_unit'])
stats['used'] = int(fs_stat[fs]['used']) * int(fs_stat[fs]['alloc_unit'])
stats['percent'] = float(stats['used'] * 100 / stats['total'])
stats['free'] = stats['total'] - stats['used']
break
else:
# Default behavior for others OS
stats = self.get_stats_snmp(snmp_oid=snmp_oid['default'])
if stats['total'] == '':
self.reset()
return self.stats
for key in iterkeys(stats):
if stats[key] != '':
stats[key] = float(stats[key]) * 1024
# Use the 'free'/htop calculation
stats['free'] = stats['free'] - stats['total'] + (stats['buffers'] + stats['cached'])
# used=total-free
stats['used'] = stats['total'] - stats['free']
# percent: the percentage usage calculated as (total - available) / total * 100.
stats['percent'] = float((stats['total'] - stats['free']) / stats['total'] * 100)
# Update the stats
self.stats = stats
return self.stats
def update_views(self):
"""Update stats views."""
# Call the father's method
super(Plugin, self).update_views()
# Add specifics information
# Alert and log
self.views['percent']['decoration'] = self.get_alert_log(self.stats['used'], maximum=self.stats['total'])
# Optional
for key in ['active', 'inactive', 'buffers', 'cached']:
if key in self.stats:
self.views[key]['optional'] = True
def msg_curse(self, args=None, max_width=None):
"""Return the dict to display in the curse interface."""
# Init the return message
ret = []
# Only process if stats exist and plugin not disabled
if not self.stats or self.is_disabled():
return ret
# First line
# total% + active
msg = '{}'.format('MEM')
ret.append(self.curse_add_line(msg, "TITLE"))
msg = ' {:2}'.format(self.trend_msg(self.get_trend('percent')))
ret.append(self.curse_add_line(msg))
# Percent memory usage
msg = '{:>7.1%}'.format(self.stats['percent'] / 100)
ret.append(self.curse_add_line(msg, self.get_views(key='percent', option='decoration')))
# Active memory usage
ret.extend(self.curse_add_stat('active', width=16, header=' '))
# Second line
# total + inactive
ret.append(self.curse_new_line())
# Total memory usage
ret.extend(self.curse_add_stat('total', width=15))
# Inactive memory usage
ret.extend(self.curse_add_stat('inactive', width=16, header=' '))
# Third line
# used + buffers
ret.append(self.curse_new_line())
# Used memory usage
ret.extend(self.curse_add_stat('used', width=15))
# Buffers memory usage
ret.extend(self.curse_add_stat('buffers', width=16, header=' '))
# Fourth line
# free + cached
ret.append(self.curse_new_line())
# Free memory usage
ret.extend(self.curse_add_stat('free', width=15))
# Cached memory usage
ret.extend(self.curse_add_stat('cached', width=16, header=' '))
return ret