go 系統監控 cpu、內存等指標

轉載（原文章地址）：https://blog.csdn.net/sinat_26682309/article/details/90457192

文檔地址：https://godoc.org/github.com/shirou/gopsutil

1. 獲取本機信息

info, _ := host.Info()
fmt.Println(info)
//output：
{"hostname":"WIN-SP09TQCP1U8","uptime":25308,"bootTime":1558574107,"procs":175,"os":"windows","platform":"Microsoft Windows 10 Pro","platformFamily":"Standalone Workstation","platformVersion":"10.0.17134 Build 17134","kernelVersion":"","virtualizationSystem":"","virtualizationRole":"","hostid":。。。}

2. 獲取CPU信息

info, _ := cpu.Info() //總體信息
fmt.Println(info) 
//output：
[{"cpu":0,cores":4,"modelName":"Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz","mhz":2501,。。。]
c, _ := cpu.Counts(true) //cpu邏輯數量
fmt.Println(c) //4
c, _ = cpu.Counts(false) //cpu物理核心
fmt.Println(c) //如果是2說明是雙核超線程, 如果是4則是4核非超線程

用戶CPU時間/系統CPU時間/空閑時間。。。等等

info, _ := cpu.Times(false)
fmt.Println(info)
//output：
[{"cpu":"cpu-total","user":1272.0,"system":1572.7,"idle":23092.3,"nice":0.0,"iowait":0.0,"irq":0.0,。。。}]
用戶CPU時間：就是用戶的進程獲得了CPU資源以后，在用戶態執行的時間。
系統CPU時間：用戶進程獲得了CPU資源以后，在內核態的執行時間。

CPU使用率，每秒刷新一次

for{
info, _ := cpu.Percent(time.Duration(time.Second), false)
fmt.Println(info)
}

3. 獲取內存信息

獲取物理內存和交換區內存信息

info, _ := mem.VirtualMemory()
fmt.Println(info)
info2, _ := mem.SwapMemory()
fmt.Println(info2)
//output：
{"total":8129818624,"available":4193423360,"used":3936395264,"usedPercent":48,"free":0,"active":0,"inactive":0,...}
{"total":8666689536,"used":4716843008,"free":3949846528,"usedPercent":0.5442496801583825,"sin":0,"sout":0,...}

總內存大小是8129818624 = 8 GB，已用3936395264 = 3.9 GB，使用了48%。而交換區大小是8666689536 = 8 GB。

4. 獲取磁盤信息

可以通過psutil獲取磁盤分區、磁盤使用率和磁盤IO信息：

info, _ := disk.Partitions(true) //所有分區
fmt.Println(info)
info2, _ := disk.Usage("E:") //指定某路徑的硬盤使用情況
fmt.Println(info2)
info3, _ := disk.IOCounters() //所有硬盤的io信息
fmt.Println(info3)
//output：
[{"device":"C:","mountpoint":"C:","fstype":"NTFS","opts":"rw.compress"} {"device":"D:","mountpoint":"D:","fstype":"NTFS","opts":"rw.compress"} {"device":"E:","mountpoint":"E:","fstype":"NTFS","opts":"rw.compress"} ]
{"path":"E:","fstype":"","total":107380965376,"free":46790828032,"used":60590137344,"usedPercent":56.425398236866755,"inodesTotal":0,"inodesUsed":0,"inodesFree":0,"inodesUsedPercent":0}
map[C::{"readCount":0,"mergedReadCount":0,"writeCount":0,"mergedWriteCount":0,"readBytes":0,"writeBytes":4096,"readTime":0,"writeTime":0,"iopsInProgress":0,"ioTime":0,"weightedIO":0,"name":"C:","serialNumber":"","label":""} 。。。]

5. 獲取網絡信息

獲取當前網絡連接信息

info, _ := net.Connections("all") //可填入tcp、udp、tcp4、udp4等等
fmt.Println(info)
//output：
[{"fd":0,"family":2,"type":1,"localaddr":{"ip":"0.0.0.0","port":135},"remoteaddr":{"ip":"0.0.0.0","port":0},"status":"LISTEN","uids":null,"pid":668} {"fd":0,"family":2,"type":1,"localaddr":{"ip":"0.0.0.0","port":445},"remoteaddr":{"ip":"0.0.0.0","port":0},"status":"LISTEN","uids":null,"pid":4} {"fd":0,"family":2,"type":1,"localaddr":{"ip":"0.0.0.0","port":1801},"remoteaddr":{"ip":"0.0.0.0","port":0},"status":"LISTEN","uids":null,"pid":3860} 
等等。。。]

獲取網絡讀寫字節／包的個數

info, _ := net.IOCounters(false)
fmt.Println(info)
//output：[{"name":"all","bytesSent":6516450,"bytesRecv":36991210,"packetsSent":21767,"packetsRecv":33990,"errin":0,"errout":0,"dropin":0,"dropout":0,"fifoin":0,"fifoout":0}]

6. 獲取進程信息

獲取到所有進程的詳細信息：

info, _ := process.Pids() //獲取當前所有進程的pid
fmt.Println(info)
//output：
[0 4 96 464 636 740 748 816 852 880 976 348 564 668 912 1048 1120 1184 1268 1288。。。]
info2,_ := process.GetWin32Proc(1120) //對應pid的進程信息 
fmt.Println(info2)
//output：
[{svchost.exe 0xc00003e570 0xc00003e580 8 2019-05-23 09:15:28.444192 +0800 CST 5600 4 0xc00003e5b0 0 0 0 0 Win32_ComputerSystem WIN-SE89TTCP7U3 0xc00003e620 Win32_Process 0xc00003e650 0xc00005331e 209 6250000 0xc000053378 0xc0000533b8 Win32_OperatingSystem Microsoft Windows 10 專業版。。。}]
fmt.Println(info2[0].ParentProcessID) //獲取父進程的pid