func GetRuntimeStats(channel chan *lib.RuntimeStatus, sleep time.Duration) {
memStats := &runtime.MemStats{}
lastSampleTime := time.Now()
var lastPauseNs uint64 = 0
var lastNumGc uint32 = 0
var runtime_status lib.RuntimeStatus
nsInMs := float64(time.Millisecond)
for {
runtime.ReadMemStats(memStats)
now := time.Now()
runtime_status.TimeString = lib.GetTimeString()
runtime_status.Alloc = memStats.Alloc
runtime_status.Sys = memStats.Sys
runtime_status.Mallocs = memStats.Mallocs
runtime_status.Frees = memStats.Frees
runtime_status.HeapAlloc = memStats.HeapAlloc
runtime_status.HeapSys = memStats.HeapSys
runtime_status.HeapIdle = memStats.HeapIdle
runtime_status.HeapInuse = memStats.HeapInuse
runtime_status.HeapObjects = memStats.HeapObjects
runtime_status.StackSys = memStats.StackSys
runtime_status.StackInuse = memStats.StackInuse
runtime_status.MSpanInuse = memStats.MSpanInuse
runtime_status.MSpanSys = memStats.MSpanSys
runtime_status.MCacheInuse = memStats.MCacheInuse
runtime_status.MCacheSys = memStats.MCacheSys
runtime_status.GCTotalPause = float64(memStats.PauseTotalNs) / nsInMs
/*
计算平均每秒GC暂停的时间
*/
// 总的GC暂停时间大于0
if lastPauseNs > 0 {
// 获取两次GC间隔的时间
pauseSinceLastSample := memStats.PauseTotalNs - lastPauseNs
runtime_status.GCPausePerSecond = float64(pauseSinceLastSample) / nsInMs / sleep.Seconds()
}
lastPauseNs = memStats.PauseTotalNs
// 两次采样之间GC的次数
countGc := int(memStats.NumGC - lastNumGc)
/*
计算平均每秒GC的次数
*/
if lastNumGc > 0 {
diff := float64(countGc)
diffTime := now.Sub(lastSampleTime).Seconds()
runtime_status.GCPerSecond = diff / diffTime
}
/*
如果两次采样之间发生了GC，则获取暂停时间(ms)
*/
if countGc > 0 {
/*
如果两次采样之间发生了超过256次的GC，就有可能获取不到一些GC动作的暂停时间
因为memStats.PauseNS是一个环形的缓存，最多只能记录256次GC动作的暂停时间
*/
if countGc > 256 {
fmt.Fprintf(os.Stderr, "We're missing some gc pause times")
countGc = 256
}
for i := 0; i < countGc; i++ {
// 最近一次的GC暂停时间保存在[(NumGC+255)%256]
idx := int((memStats.NumGC-uint32(i))+255) % 256
pause := float64(memStats.PauseNs[idx])
// 暂停时间单位为ns，ns/nsInMs单位为ms
runtime_status.GCPause = pause / nsInMs
}
}
// 记录前一次的状态，为下次采样做准备
lastNumGc = memStats.NumGC
lastSampleTime = now
channel <- &runtime_status
time.Sleep(sleep)
}
}
func GetLoadInfo(channel chan *lib.LoadInfo, sleep time.Duration) {
var load_info lib.LoadInfo
for {
meminfo_file := "/proc/meminfo"
meminfo_data, err := lib.ReadFileFullContentByLine(meminfo_file)
if err != nil {
log.Fatal(err)
return
}
now_time := lib.GetTimeString()
load_info.TimeString = now_time
meminfo_total_splited := bytes.Fields(meminfo_data[0])
meminfo_free_splited := bytes.Fields(meminfo_data[1])
meminfo_buffers_splited := bytes.Fields(meminfo_data[2])
meminfo_cached_splited := bytes.Fields(meminfo_data[3])
if v, err := strconv.ParseUint(string(meminfo_total_splited[1]), 10, 0); err == nil {
load_info.MemTotal = v
}
if v, err := strconv.ParseUint(string(meminfo_free_splited[1]), 10, 0); err == nil {
load_info.MemFree = v
}
if v, err := strconv.ParseUint(string(meminfo_buffers_splited[1]), 10, 0); err == nil {
load_info.MemBuffers = v
}
if v, err := strconv.ParseUint(string(meminfo_cached_splited[1]), 10, 0); err == nil {
load_info.MemCached = v
}
load_info.MemUsed = load_info.MemTotal - load_info.MemFree
loadavg_file := "/proc/loadavg"
loadavg_data, err := lib.ReadFileFullContent(loadavg_file)
if err != nil {
log.Fatal(err)
return
}
loadavg_splited := strings.Split(string(loadavg_data), " ")
if len(loadavg_splited) > 0 {
// 1分钟内的负载
load1 := strings.Trim(loadavg_splited[0], " ")
if v, err := strconv.ParseFloat(load1, 64); err == nil {
load_info.LoadAVG1 = v
}
// 5分钟内的负载
load5 := strings.Trim(loadavg_splited[1], " ")
if v, err := strconv.ParseFloat(load5, 64); err == nil {
load_info.LoadAVG5 = v
}
// 15分钟内的负载
load15 := strings.Trim(loadavg_splited[2], " ")
if v, err := strconv.ParseFloat(load15, 64); err == nil {
load_info.LoadAVG15 = v
}
}
channel <- &load_info
time.Sleep(sleep)
}
}
// 获取进程的信息
func GetProcessInfo(channel chan *lib.ProcessInfo, sleep time.Duration) {
/*
Process's memory status in /proc/PID/statm:
total program pages |
resident pages |
shared pages |
text(code) |
data/stack |
library |
dirty pages
page size is 4K
*/
var process_info lib.ProcessInfo
pagesize := int64(os.Getpagesize())
for {
pid := os.Getpid()
statm_file := fmt.Sprintf("/proc/%d/statm", pid)
data, err := lib.ReadFileFullContent(statm_file)
if err != nil {
log.Fatal(err)
return
}
now_time := lib.GetTimeString()
process_info.TimeString = now_time
memory_splited := strings.Split(string(data), " ")
if len(memory_splited) > 0 {
// 虚拟内存(VIRT)
virtual_pages := strings.Trim(memory_splited[0], " ")
if v, err := strconv.ParseInt(virtual_pages, 10, 0); err == nil {
process_info.VirtualMemory = v * pagesize
}
// 物理内存(RES)
resisdent_pages := strings.Trim(memory_splited[1], " ")
if v, err := strconv.ParseInt(resisdent_pages, 10, 0); err == nil {
process_info.ResisdentMemory = v * pagesize
}
// 共享内存(SHR)
shared_pages := strings.Trim(memory_splited[2], " ")
if v, err := strconv.ParseInt(shared_pages, 10, 0); err == nil {
process_info.SharedMemory = v * pagesize
}
}
// 进程运行了多长时间
process_info.Uptime = int64(time.Now().Sub(lib.StartTime).Seconds())
channel <- &process_info
time.Sleep(sleep)
}
}