46 lines
1.6 KiB
Go
46 lines
1.6 KiB
Go
// Mgmt
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// Copyright (C) 2013-2018+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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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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// +build !darwin
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package core // TODO: should this be in its own individual package?
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import (
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"syscall"
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)
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const (
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// LoadScale factor scales the output from sysinfo to the correct float
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// value.
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LoadScale = 65536 // XXX: is this correct or should it be 65535?
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)
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// load returns the system load averages for the last minute, five minutes and
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// fifteen minutes. Calling this more often than once every five seconds seems
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// to be unnecessary, since the kernel only updates these values that often.
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// TODO: is the kernel update interval configurable?
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func load() (one, five, fifteen float64, err error) {
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var sysinfo syscall.Sysinfo_t
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if err = syscall.Sysinfo(&sysinfo); err != nil {
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return
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}
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one = float64(sysinfo.Loads[0]) / LoadScale
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five = float64(sysinfo.Loads[1]) / LoadScale
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fifteen = float64(sysinfo.Loads[2]) / LoadScale
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return
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}
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