mirror of https://github.com/nicolargo/glances.git
133 lines
5.1 KiB
Python
133 lines
5.1 KiB
Python
#
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# This file is part of Glances.
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#
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# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
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#
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# SPDX-License-Identifier: LGPL-3.0-only
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#
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"""CPU percent stats shared between CPU and Quicklook plugins."""
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import psutil
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from glances.logger import logger
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from glances.timer import Timer
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class CpuPercent:
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"""Get and store the CPU percent."""
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def __init__(self, cached_timer_cpu=2):
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# cached_timer_cpu is the minimum time interval between stats updates
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# since last update is passed (will retrieve old cached info instead)
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self.cached_timer_cpu = cached_timer_cpu
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# psutil.cpu_freq() consumes lots of CPU
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# So refresh CPU frequency stats every refresh * 2
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self.cached_timer_cpu_info = cached_timer_cpu * 2
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# Get CPU name
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self.timer_cpu_info = Timer(0)
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self.cpu_info = {'cpu_name': self.__get_cpu_name(), 'cpu_hz_current': None, 'cpu_hz': None}
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# Warning from PsUtil documentation
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# The first time this function is called with interval = 0.0 or None
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# it will return a meaningless 0.0 value which you are supposed to ignore.
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self.timer_cpu = Timer(0)
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self.cpu_percent = self.get_cpu()
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self.timer_percpu = Timer(0)
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self.percpu_percent = self.get_percpu()
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def get_key(self):
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"""Return the key of the per CPU list."""
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return 'cpu_number'
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def get_info(self):
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"""Get additional information about the CPU"""
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# Never update more than 1 time per cached_timer_cpu_info
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if self.timer_cpu_info.finished() and hasattr(psutil, 'cpu_freq'):
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# Get the CPU freq current/max
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try:
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cpu_freq = psutil.cpu_freq()
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except Exception as e:
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logger.debug(f'Can not grab CPU information ({e})')
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else:
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if hasattr(cpu_freq, 'current'):
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self.cpu_info['cpu_hz_current'] = cpu_freq.current
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else:
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self.cpu_info['cpu_hz_current'] = None
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if hasattr(cpu_freq, 'max'):
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self.cpu_info['cpu_hz'] = cpu_freq.max
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else:
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self.cpu_info['cpu_hz'] = None
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# Reset timer for cache
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self.timer_cpu_info.reset(duration=self.cached_timer_cpu_info)
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return self.cpu_info
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def __get_cpu_name(self):
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# Get the CPU name once from the /proc/cpuinfo file
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# Read the first line with the "model name"
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ret = None
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try:
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cpuinfo_file = open('/proc/cpuinfo').readlines()
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except (FileNotFoundError, PermissionError):
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pass
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else:
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for line in cpuinfo_file:
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if line.startswith('model name'):
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ret = line.split(':')[1].strip()
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break
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return ret if ret else 'CPU'
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def get_cpu(self):
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"""Update and/or return the CPU using the psutil library."""
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# Never update more than 1 time per cached_timer_cpu
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if self.timer_cpu.finished():
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# Reset timer for cache
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self.timer_cpu.reset(duration=self.cached_timer_cpu)
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# Update the stats
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self.cpu_percent = psutil.cpu_percent(interval=0.0)
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return self.cpu_percent
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def get_percpu(self):
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"""Update and/or return the per CPU list using the psutil library."""
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# Never update more than 1 time per cached_timer_cpu
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if self.timer_percpu.finished():
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# Reset timer for cache
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self.timer_percpu.reset(duration=self.cached_timer_cpu)
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# Get stats
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percpu_percent = []
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psutil_percpu = enumerate(psutil.cpu_times_percent(interval=0.0, percpu=True))
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for cpu_number, cputimes in psutil_percpu:
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cpu = {
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'key': self.get_key(),
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'cpu_number': cpu_number,
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'total': round(100 - cputimes.idle, 1),
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'user': cputimes.user,
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'system': cputimes.system,
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'idle': cputimes.idle,
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}
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# The following stats are for API purposes only
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if hasattr(cputimes, 'nice'):
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cpu['nice'] = cputimes.nice
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if hasattr(cputimes, 'iowait'):
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cpu['iowait'] = cputimes.iowait
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if hasattr(cputimes, 'irq'):
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cpu['irq'] = cputimes.irq
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if hasattr(cputimes, 'softirq'):
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cpu['softirq'] = cputimes.softirq
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if hasattr(cputimes, 'steal'):
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cpu['steal'] = cputimes.steal
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if hasattr(cputimes, 'guest'):
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cpu['guest'] = cputimes.guest
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if hasattr(cputimes, 'guest_nice'):
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cpu['guest_nice'] = cputimes.guest_nice
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# Append new CPU to the list
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percpu_percent.append(cpu)
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# Update stats
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self.percpu_percent = percpu_percent
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return self.percpu_percent
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# CpuPercent instance shared between plugins
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cpu_percent = CpuPercent()
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