curator/lib/system/procPoller.js

A flexible process monitoring and management framework.

(function() {
  var fs, hertz, ipcpu, kb_per_page, mem, os, pcpu, pmem;
  fs = require('fs');
  os = require('os');
  kb_per_page = 4;
  hertz = 100;
  mem = function(stat) {
    return stat.rss * kb_per_page;
  };
  pmem = function(stat) {
    return stat.mem * 1024 / os.totalmem() * 100;
  };
  pcpu = function(stat) {
    var seconds, total_time;
    total_time = stat.utime + stat.stime;
    seconds = stat.timestamp - stat.starttime / hertz;
    return (total_time * 1000 / hertz) / seconds / 10;
  };
  ipcpu = exports.ipcpu = function(old_utime, old_stime, interval, stat) {
    var seconds, total_time;
    total_time = stat.utime + stat.stime - old_utime - old_stime;
    seconds = interval / 1000;
    return (total_time * 1000 / hertz) / seconds / 10;
  };
  exports.poll = function(pid, callback) {
    return fs.readFile("/proc/" + pid + "/stat", function(err, data) {
      var stat;
      if (err) {
        callback(err, null);
        return;
      }
      data = data.toString('ascii').split(' ');
      stat = {
        pid: parseInt(data[0]),
        comm: data[1],
        state: data[2],
        ppid: parseInt(data[3]),
        pgrp: parseInt(data[4]),
        session: parseInt(data[5]),
        tty_nr: parseInt(data[6]),
        tpgid: parseInt(data[7]),
        flags: parseInt(data[8]),
        minflt: parseInt(data[9]),
        cminflt: parseInt(data[10]),
        majflt: parseInt(data[11]),
        cmajflt: parseInt(data[12]),
        utime: parseInt(data[13]),
        stime: parseInt(data[14]),
        cutime: parseInt(data[15]),
        cstime: parseInt(data[16]),
        priority: parseInt(data[17]),
        nice: parseInt(data[18]),
        num_threads: parseInt(data[19]),
        itrealvalue: parseInt(data[20]),
        starttime: parseInt(data[21]),
        vsize: parseInt(data[22]),
        rss: parseInt(data[23]),
        rsslim: parseInt(data[24]),
        startcode: parseInt(data[25]),
        endcode: parseInt(data[26]),
        startstack: parseInt(data[27]),
        kstkesp: parseInt(data[28]),
        kstkeip: parseInt(data[29]),
        signal: parseInt(data[30]),
        blocked: parseInt(data[31]),
        sigignore: parseInt(data[32]),
        sigcatch: parseInt(data[33]),
        wchan: parseInt(data[34]),
        nswap: parseInt(data[35]),
        cnswap: parseInt(data[36]),
        exit_signal: parseInt(data[37]),
        processor: parseInt(data[38]),
        rt_priority: parseInt(data[39]),
        policy: parseInt(data[40]),
        delayacct_blkio_ticks: parseInt(data[41]),
        guest_time: parseInt(data[42]),
        cguest_time: parseInt(data[43].trim())
      };
      stat.timestamp = os.uptime();
      stat.mem = mem(stat);
      stat.pmem = pmem(stat);
      stat.pcpu = pcpu(stat);
      return callback(null, stat);
    });
  };
}).call(this);