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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
#
"""CPU percent stats shared between CPU and Quicklook plugins."""
from glances.logger import logger
from glances.timer import Timer
import psutil
class CpuPercent(object):
"""Get and store the CPU percent."""
def __init__(self, cached_timer_cpu=3):
self.cpu_info = {'cpu_name': None, 'cpu_hz_current': None, 'cpu_hz': None}
self.cpu_percent = 0
self.percpu_percent = []
# Get CPU name
self.__get_cpu_name()
# cached_timer_cpu is the minimum time interval between stats updates
# since last update is passed (will retrieve old cached info instead)
self.cached_timer_cpu = cached_timer_cpu
self.timer_cpu = Timer(0)
self.timer_percpu = Timer(0)
# psutil.cpu_freq() consumes lots of CPU
# So refresh the stats every refresh*2 (6 seconds)
self.cached_timer_cpu_info = cached_timer_cpu * 2
self.timer_cpu_info = Timer(0)
def get_key(self):
"""Return the key of the per CPU list."""
return 'cpu_number'
def get(self, percpu=False):
"""Update and/or return the CPU using the psutil library.
If percpu, return the percpu stats"""
if percpu:
return self.__get_percpu()
else:
return self.__get_cpu()
def get_info(self):
"""Get additional information about the CPU"""
# Never update more than 1 time per cached_timer_cpu_info
if self.timer_cpu_info.finished() and hasattr(psutil, 'cpu_freq'):
# Get the CPU freq current/max
try:
cpu_freq = psutil.cpu_freq()
except Exception as e:
logger.debug('Can not grab CPU information ({})'.format(e))
else:
if hasattr(cpu_freq, 'current'):
self.cpu_info['cpu_hz_current'] = cpu_freq.current
else:
self.cpu_info['cpu_hz_current'] = None
if hasattr(cpu_freq, 'max'):
self.cpu_info['cpu_hz'] = cpu_freq.max
else:
self.cpu_info['cpu_hz'] = None
# Reset timer for cache
self.timer_cpu_info.reset(duration=self.cached_timer_cpu_info)
return self.cpu_info
def __get_cpu_name(self):
# Get the CPU name once from the /proc/cpuinfo file
# TODO: Multisystem...
try:
self.cpu_info['cpu_name'] = open('/proc/cpuinfo', 'r').readlines()[4].split(':')[1].strip()
except (FileNotFoundError, PermissionError, IndexError, KeyError, AttributeError):
self.cpu_info['cpu_name'] = 'CPU'
return self.cpu_info['cpu_name']
def __get_cpu(self):
"""Update and/or return the CPU using the psutil library."""
# Never update more than 1 time per cached_timer_cpu
if self.timer_cpu.finished():
self.cpu_percent = psutil.cpu_percent(interval=0.0)
# Reset timer for cache
self.timer_cpu.reset(duration=self.cached_timer_cpu)
return self.cpu_percent
def __get_percpu(self):
"""Update and/or return the per CPU list using the psutil library."""
# Never update more than 1 time per cached_timer_cpu
if self.timer_percpu.finished():
self.percpu_percent = []
for cpu_number, cputimes in enumerate(psutil.cpu_times_percent(interval=0.0, percpu=True)):
cpu = {
'key': self.get_key(),
'cpu_number': cpu_number,
'total': round(100 - cputimes.idle, 1),
'user': cputimes.user,
'system': cputimes.system,
'idle': cputimes.idle,
}
# The following stats are for API purposes only
if hasattr(cputimes, 'nice'):
cpu['nice'] = cputimes.nice
if hasattr(cputimes, 'iowait'):
cpu['iowait'] = cputimes.iowait
if hasattr(cputimes, 'irq'):
cpu['irq'] = cputimes.irq
if hasattr(cputimes, 'softirq'):
cpu['softirq'] = cputimes.softirq
if hasattr(cputimes, 'steal'):
cpu['steal'] = cputimes.steal
if hasattr(cputimes, 'guest'):
cpu['guest'] = cputimes.guest
if hasattr(cputimes, 'guest_nice'):
cpu['guest_nice'] = cputimes.guest_nice
# Append new CPU to the list
self.percpu_percent.append(cpu)
# Reset timer for cache
self.timer_percpu.reset(duration=self.cached_timer_cpu)
return self.percpu_percent
# CpuPercent instance shared between plugins
cpu_percent = CpuPercent()
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