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https://github.com/GNS3/gns3-server.git
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49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2020 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import psutil
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import time
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class CpuPercent:
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"""
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Ensures a minumum interval between two cpu_percent() calls
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"""
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_last_measurement = None # time of last measurement
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_last_cpu_percent = 0.0 # last cpu_percent
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@classmethod
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def get(cls, interval=None):
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"""
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Get CPU utilization as a percentage
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:returns: float
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"""
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if interval:
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cls._last_cpu_percent = psutil.cpu_percent(interval=interval)
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cls._last_measurement = time.monotonic()
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else:
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cur_time = time.monotonic()
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if cls._last_measurement is None or \
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(cur_time - cls._last_measurement) >= 1.9:
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cls._last_cpu_percent = psutil.cpu_percent(interval=None)
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cls._last_measurement = cur_time
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return cls._last_cpu_percent
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