psutil（https://github.com/giampaolo/psutil）是python的一个module，可以获取各种系统信息，很好用，于是动手搬运到了Node上

底层的C/C++实现基本没动，只是把接口的封装改成了Node的

现在所有API都是同步的，后续会支持异步

C/C++的接口是基于Node稳定版本做的（v0.10.28），v0.11以上不可用

支持OSX和Linux，暂不支持windows

我预先编译了OSX64位、Linux32位、Linux64位的二进制文件

在test目录下make一下（需要mocha），可以测一下接口是否都能跑通

跑不通的话可以自己再编译一下

编译不过或其他问题都可以求助stackoverflow

完整代码：https://github.com/x6doooo/nsutil

使用示例：

var ns = require('nsutil')

####CPU

>>> ns.cpuTimes() 
 { user: 40.76, nice: 118.53, system: 683.01, idle: 287470.94 }

>>> ns.perCpuTimes()
 [ { user: 174.18, nice: 0, sys: 123.64, idle: 1411.73 },
   { user: 68.05,  nice: 0, sys: 42.15,  idle: 1599.30 },
   { user: 129.05, nice: 0, sys: 62.55,  idle: 1517.90 },
   { user: 58.15,  nice: 0, sys: 28.77,  idle: 1622.58 } ] 

>>> ns.cpuCountLogical()
 4

>>> ns.cpuCountPhys()
 2

####Memory

>>> ns.virtualMemory()
 // OSX
 { total:    4294967296,
   active:   1476833280,
   inactive: 926130176,
   wire:     1203470336,
   free:     237256704,
   avail:    1163386880,
   used:     3606433792 }
 // Linux
 { total:    383238144,
   avail:    315265024,
   inactive: 71880704,
   used:     206503936,
   free:     176734208,
   active:   66637824,
   buffers:  25927680,
   cached:   112603136 }

>>> ns.swapMemory()
 { total: 1073741824,
   used:  6815744,
   free:  1066926080,
   sin:   2724483072,
   sout:  20860928 }    

####Disks

>>> ns.diskPartitions()
 [ { device: '/dev/disk0s2',
     mount_point: '/',
     fs_type: 'hfs',
     options: 'rw,local,rootfs,dovolfs,journaled,multilabel' },
   { device: 'devfs',
     mount_point: '/dev',
     fs_type: 'devfs',
     options: 'rw,local,dontbrowse,multilabel' },
     ...] 

>>> ns.diskIOCounters()
 { disk0: 
   { reads: 1170484,
     writes: 668337,
     read_bytes: 18236701696,
     write_bytes: 21262711296,
     read_time: 825561,
     write_time: 540807 },
   disk1:
   { reads: 11704,
     writes: 6683,
     read_bytes: 182367016,
     write_bytes: 212627112,
     read_time: 8255,
     write_time: 5408 }
   ...}      

####Network

>>> ns.netConnections()
 [ { fd: 22,
     family: 'AF_INET',
     type: 'SOCK_STREAM',
     laddr: ['X.X.X.X', XXXX],
     raddr: ['X.X.X.X', XXXX],
     state: 'ESTABLISHED' },
    ...]

>>> ns.netIOCounters()
 { bridge0: 
   { obytes: 684,
     ibytes: 0,
     opkts: 2,
     ipkts: 0,
     oerrs: 0,
     ierrs: 0,
     iqdrops: 0 },
  en0: 
   { obytes: 160304770,
     ibytes: 2578607670,
     opkts: 1614175,
     ipkts: 2421909,
     oerrs: 0,
     ierrs: 0,
     iqdrops: 0 },
  ...}

####Other system info

>>> ns.bootTime()
 1400543744000 // timestamp ms

>>> ns.users()
 [
  {"username":"Dx.Yang", "tty":"console", "host":"", "startTime":1400548608},
  {"username":"Dx.Yang", "tty":"ttys000", "host":"", "startTime":1400548608},
  {"username":"Dx.Yang", "tty":"ttys001", "host":"", "startTime":1400548608}
 ]

####Process management

>>> ns.pids()
 [6652,6651,6640,6639,6638,6633,6632,6615,6606...]

>>> proc = ns.Process(pid)

>>> proc.name()
 'node'

>>> proc.exe()
 '/usr/local/bin/node'

>>> proc.cmdline()
 [ 'node',
   '/usr/local/lib/node_modules/mocha/bin/_mocha',
   'test_osx.js',
   '-R',
   'spec' ]

>>> proc.ppid()
 6651  //parent process id    

>>> proc.cwd()
 '/Users/node_modules/nsutil/test'

>>> proc.uids()
 { real: 501, effective: 501, saved: 501 }

>>> proc.gids()
 { real: 20, effective: 20, saved: 20 }

>>> proc.terminal()
 '/dev/ttys004'

>>> proc.memoryInfo()   
 { rss: 18440192, vms: 3119169536 }

>>> proc.cpuTimes()
 { user: 0.139774113, sys: 0.027113125 }

>>> proc.createTime()
 1400565545000 // timestamp ms

>>> proc.numCtxSwitches()
 { voluntary: 32, involuntary: 4 } 

>>> proc.numThreads()
 4

>>> proc.openFiles()
 [ { path: '/dev/ttys004', fd: 0 },
   { path: '/dev/ttys004', fd: 1 },
   { path: '/dev/ttys004', fd: 2 },
  ... ]

>>> proc.connections('inet')    // default is 'all'
 [ { fd: 22,
     family: 'AF_INET',
     type: 'SOCK_STREAM',
     laddr: ['X.X.X.X', XXXX],
     raddr: ['X.X.X.X', XXXX],
     state: 'ESTABLISHED' },
    ...] 

>>> proc.numFds()
 12

>>> proc.getNice()
 0

>>> proc.setNice(niceValue)

>>> proc.status()
 'running'

>>> proc.threads()
 [ { idx: 1, 
     user: 0.14695000648498535, 
     sys: 0.02574799954891205 },
   { idx: 2,
     user: 0.00007100000220816582,
     sys: 0.00008600000001024455 },
   { idx: 3,
     user: 0.00002499999936844688,
     sys: 0.00008499999967170879 },
   { idx: 4,
     user: 0.0006169999833218753,
     sys: 0.0019920000340789557 } ]

>>> proc.memMaps()
 // OSX
 [
    {
        "pmmap_ext" : "0000000100000000-0000000100617000",
        "addr_perms" : "r-x/rwx",
        "path":"/usr/local/bin/node",
        "rss" : 45056,
        "private" : 0,
        "swapped" : 0,
        "dirtied" : 0,
        "ref_count" : 7,
        "shadow_depth" : 1
    },
    ...]
 // Linux
 [
    {  
        "pmmap_ext": "7f1517342000-7f151734e000",
        "addr_perms": "r-xp",
        "path": "/lib/x86_64-linux-gnu/libnss_files-2.17.so",
        "Size": 49152,
        "Rss": 0, 
        "Pss": 0, 
        "Shared_Clean": 0, 
        "Shared_Dirty": 0, 
        "Private_Clean": 0,
        "Private_Dirty": 0,
        "Referenced": 0,
        "Anonymous": 0,
        "AnonHugePages": 0,
        "Swap": 0,
        "KernelPageSize": 4096,
        "MMUPageSize": 4096,
        "Locked": 0
    },
    ...]

>>> proc.ioCounters()   // Linux only
 { rcount: 20474, wcount: 14600, rbytes: 2109440, wbytes: 8192 }