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# This file is part of Glances. |
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# |
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# SPDX-FileCopyrightText: 2022 Nicolas Hennion <[email protected]> |
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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" ("Model" for Raspberry Pi) |
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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') or line.startswith('Model') or line.startswith('cpu model'): |
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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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nicolargo /
glances
