github.com/livekit/protocol@v1.16.1-0.20240517185851-47e4c6bba773/utils/hwstats/cpu_all.go (about)

     1  // Copyright 2023 LiveKit, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package hwstats
    16  
    17  import (
    18  	"runtime"
    19  
    20  	"github.com/mackerelio/go-osstat/cpu"
    21  )
    22  
    23  type osStatCPUMonitor struct {
    24  	prev *cpu.Stats
    25  }
    26  
    27  func newOSStatCPUMonitor() (*osStatCPUMonitor, error) {
    28  	stats, err := cpu.Get()
    29  	if err != nil {
    30  		return nil, err
    31  	}
    32  
    33  	return &osStatCPUMonitor{
    34  		prev: stats,
    35  	}, nil
    36  }
    37  
    38  func (p *osStatCPUMonitor) getCPUIdle() (float64, error) {
    39  	next, err := cpu.Get()
    40  	if err != nil {
    41  		return 0, err
    42  	}
    43  	idleRatio := float64(next.Idle-p.prev.Idle) / float64(next.Total-p.prev.Total)
    44  	p.prev = next
    45  
    46  	return p.numCPU() * idleRatio, nil
    47  }
    48  
    49  func (p *osStatCPUMonitor) numCPU() float64 {
    50  	return float64(runtime.NumCPU())
    51  }