go 语言 获取物理机器主要参数

获取disk参数

命令行：

df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 41153856 28058544 10998160 72% /
tmpfs 3925384 0 3925384 0% /dev/shm
/dev/sda1 487652 144402 317650 32% /boot
/dev/sda5 915383628 307557352 561320756 36% /home

通过/proc虚拟文件系统

cat /proc/diskstats
输出：
1 0 ram0 0 0 0 0 0 0 0 0 0 0 0
1 1 ram1 0 0 0 0 0 0 0 0 0 0 0
1 2 ram2 0 0 0 0 0 0 0 0 0 0 0
1 3 ram3 0 0 0 0 0 0 0 0 0 0 0
1 4 ram4 0 0 0 0 0 0 0 0 0 0 0
1 5 ram5 0 0 0 0 0 0 0 0 0 0 0
1 6 ram6 0 0 0 0 0 0 0 0 0 0 0
1 7 ram7 0 0 0 0 0 0 0 0 0 0 0
1 8 ram8 0 0 0 0 0 0 0 0 0 0 0
1 9 ram9 0 0 0 0 0 0 0 0 0 0 0
1 10 ram10 0 0 0 0 0 0 0 0 0 0 0
1 11 ram11 0 0 0 0 0 0 0 0 0 0 0
1 12 ram12 0 0 0 0 0 0 0 0 0 0 0
1 13 ram13 0 0 0 0 0 0 0 0 0 0 0
1 14 ram14 0 0 0 0 0 0 0 0 0 0 0
1 15 ram15 0 0 0 0 0 0 0 0 0 0 0
7 0 loop0 0 0 0 0 0 0 0 0 0 0 0
7 1 loop1 0 0 0 0 0 0 0 0 0 0 0
7 2 loop2 0 0 0 0 0 0 0 0 0 0 0
7 3 loop3 0 0 0 0 0 0 0 0 0 0 0
7 4 loop4 0 0 0 0 0 0 0 0 0 0 0
7 5 loop5 0 0 0 0 0 0 0 0 0 0 0
7 6 loop6 0 0 0 0 0 0 0 0 0 0 0
7 7 loop7 0 0 0 0 0 0 0 0 0 0 0
11 0 sr0 0 0 0 0 0 0 0 0 0 0 0
8 0 sda 1344106 1663542 29293600 2377613 270750 5550066 46583400 27877737 0 3015302 30258156
8 1 sda1 696 275 27488 597 20 6 64 531 0 1011 1127
8 2 sda2 116010 51679 5829362 327116 167370 1100011 10139128 2335122 0 1163309 2662218
8 3 sda3 6206 23271 235816 39420 8468 856234 6928160 2516768 0 50862 2557927
8 4 sda4 3 0 12 86 0 0 0 0 0 86 86
8 5 sda5 1221018 1588316 23199530 2010088 94071 3593815 29516048 23017612 0 1998328 25028788
8 16 sdb 0 0 0 0 0 0 0 0 0 0 0
8 32 sdc 0 0 0 0 0 0 0 0 0 0 0
8 80 sdf 0 0 0 0 0 0 0 0 0 0 0
8 64 sde 0 0 0 0 0 0 0 0 0 0 0
8 48 sdd 0 0 0 0 0 0 0 0 0 0 0

go代码(读取/proc/diskstats来实现)

package diskimport "golang.org/x/sys/unix"// Usage returns a file system usage. path is a filessytem path such// as "/", not device file path like "/dev/vda1".  If you want to use// a return value of disk.Partitions, use "Mountpoint" not "Device".func Usage(path string) (*UsageStat, error) {        stat := unix.Statfs_t{}        err := unix.Statfs(path, &stat)        if err != nil {                return nil, err        }        bsize := stat.Bsize        ret := &UsageStat{                Path:        path,                Fstype:      getFsType(stat),                Total:       (uint64(stat.Blocks) * uint64(bsize)),                Free:        (uint64(stat.Bavail) * uint64(bsize)),                InodesTotal: (uint64(stat.Files)),                InodesFree:  (uint64(stat.Ffree)),        }        // if could not get InodesTotal, return empty        if ret.InodesTotal < ret.InodesFree {                return ret, nil        }        ret.InodesUsed = (ret.InodesTotal - ret.InodesFree)        ret.Used = (uint64(stat.Blocks) - uint64(stat.Bfree)) * uint64(bsize)        if ret.InodesTotal == 0 {                ret.InodesUsedPercent = 0        } else {                ret.InodesUsedPercent = (float64(ret.InodesUsed) / float64(ret.InodesTotal)) * 100.0        }        if ret.Total == 0 {                ret.UsedPercent = 0        } else {                ret.UsedPercent = (float64(ret.Used) / float64(ret.Total)) * 100.0        }        return ret, nil}//返回的数据的结构体type UsageStat struct {        Path              string  `json:"path"`        Fstype            string  `json:"fstype"`        Total             uint64  `json:"total"`    //总大小        Free              uint64  `json:"free"`     //空闲大小        Used              uint64  `json:"used"`     //已用部分        UsedPercent       float64 `json:"usedPercent"` //磁盘使用率        InodesTotal       uint64  `json:"inodesTotal"`        InodesUsed        uint64  `json:"inodesUsed"`        InodesFree        uint64  `json:"inodesFree"`        InodesUsedPercent float64 `json:"inodesUsedPercent"`}通过github.com/shirou/gopsutil包调用：func disk_usage() {    d, _ := disk.Usage("/")    percent.disk_percent = d.UsedPercent}

获取cpu参数

通过命令行：

top
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 41153856 28058544 10998160 72% /
tmpfs 3925384 0 3925384 0% /dev/shm
/dev/sda1 487652 144402 317650 32% /boot
/dev/sda5 915383628 307557352 561320756 36% /home
….

通过/proc虚拟文件系统

/usr/bin/getconf
该进程主要用于监控系统cpu参数(可执行文件)

获取memory参数

命令行

free -m(基本块大小为M)
total used free shared buffers cached
Mem: 7666 6973 693 0 2784 2805
-/+ buffers/cache: 1383 6282
Swap: 4095 835 3260

通过/proc虚拟文件系统

cat /proc/meminfo (kernel 3.14+)

输出：是以键值对来存储的
MemTotal: 7850772 kB
MemFree: 711436 kB
Buffers: 2851584 kB
Cached: 2872556 kB
SwapCached: 79620 kB
Active: 1830980 kB
Inactive: 4040144 kB
Active(anon): 44892 kB
Inactive(anon): 102820 kB
Active(file): 1786088 kB
Inactive(file): 3937324 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 4194300 kB
SwapFree: 3338684 kB
Dirty: 92 kB
Writeback: 0 kB
AnonPages: 76016 kB
Mapped: 19784 kB
Shmem: 672 kB
Slab: 1151128 kB
SReclaimable: 1114740 kB
SUnreclaim: 36388 kB
KernelStack: 5424 kB
PageTables: 15536 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 8119684 kB
Committed_AS: 3045240 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 366300 kB
VmallocChunk: 34359351684 kB
HardwareCorrupted: 0 kB
AnonHugePages: 32768 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 6144 kB
DirectMap2M: 1908736 kB
DirectMap1G: 6291456 kB

go代码(读取/proc/meminfo 来实现)

package memimport (        "strconv"        "strings"        "github.com/shirou/gopsutil/internal/common"        "golang.org/x/sys/unix")func VirtualMemory() (*VirtualMemoryStat, error) {        filename := common.HostProc("meminfo")        lines, _ := common.ReadLines(filename)        // flag if MemAvailable is in /proc/meminfo (kernel 3.14+)        memavail := false        ret := &VirtualMemoryStat{}        for _, line := range lines {                fields := strings.Split(line, ":")                if len(fields) != 2 {                        continue                }                key := strings.TrimSpace(fields[0])                value := strings.TrimSpace(fields[1])                value = strings.Replace(value, " kB", "", -1)                t, err := strconv.ParseUint(value, 10, 64)                if err != nil {                        return ret, err                }                switch key {                case "MemTotal":                        ret.Total = t * 1024                case "MemFree":                        ret.Free = t * 1024                case "MemAvailable":                        memavail = true                        ret.Available = t * 1024                case "Buffers":                        ret.Buffers = t * 1024                case "Cached":                        ret.Cached = t * 1024                case "Active":                        ret.Active = t * 1024                case "Inactive":                        ret.Inactive = t * 1024                case "Writeback":                        ret.Writeback = t * 1024                case "WritebackTmp":                        ret.WritebackTmp = t * 1024                case "Dirty":                        ret.Dirty = t * 1024                case "Shmem":                        ret.Shared = t * 1024                case "Slab":                        ret.Slab = t * 1024                case "PageTables":                        ret.PageTables = t * 1024                case "SwapCached":                        ret.SwapCached = t * 1024                }        }        if !memavail {                ret.Available = ret.Free + ret.Buffers + ret.Cached        }        ret.Used = ret.Total - ret.Available        ret.UsedPercent = float64(ret.Total-ret.Available) / float64(ret.Total) * 100.0        return ret, nil}//返回的数据结构体，包含了memory的各种信息type VirtualMemoryStat struct {// Total amount of RAM on this system        Total uint64 `json:"total"`    //总内存大小        // RAM available for programs to allocate        //        // This value is computed from the kernel specific values.        Available uint64 `json:"available"`    //可用大小        // RAM used by programs        //        // This value is computed from the kernel specific values.        Used uint64 `json:"used"`           //已用内存大小        // Percentage of RAM used by programs        //        // This value is computed from the kernel specific values.        UsedPercent float64 `json:"usedPercent"`  //内存使用率        // This is the kernel's notion of free memory; RAM chips whose bits nobody        // cares about the value of right now. For a human consumable number,        // Available is what you really want.        Free uint64 `json:"free"`        //内存剩余大小        // OS X / BSD specific numbers:        // http://www.macyourself.com/2010/02/17/what-is-free-wired-active-and-inactive-system-memory-ram/        Active   uint64 `json:"active"`        Inactive uint64 `json:"inactive"`        Wired    uint64 `json:"wired"`        // Linux specific numbers        // https://www.centos.org/docs/5/html/5.1/Deployment_Guide/s2-proc-meminfo.html        // https://www.kernel.org/doc/Documentation/filesystems/proc.txt        Buffers      uint64 `json:"buffers"`     //缓冲区占用内存大小        Cached       uint64 `json:"cached"`      //缓存大小        Writeback    uint64 `json:"writeback"`        Dirty        uint64 `json:"dirty"`        WritebackTmp uint64 `json:"writebacktmp"`        Shared       uint64 `json:"shared"`      //共享内存大小        Slab         uint64 `json:"slab"`        PageTables   uint64 `json:"pagetables"`        SwapCached   uint64 `json:"swapcached"`}}//UsedPercent大小计算：        ret.Available = ret.Free + ret.Buffers + ret.Cached        ret.Used = ret.Total - ret.Available        ret.UsedPercent = float64(ret.Total-ret.Available) / float64(ret.Total) //通过free shell命令：            total       used       free     shared    buffers     cachedMem:       7850772    7175268     675504        676    2863600    2896044-/+ buffers/cache:    1415624    6435148Swap:      4194300     855496    3338804//通过github.com/shirou/gopsutil包调用：func mem_usage() {    v, _ := mem.VirtualMemory()  //返回的VirtualMemoryStat结构有各个不同的信息    percent.mem_percent = v.UsedPercent    //mem_percent = (float64)((v.Used)/(v.Total))}