docs: function format(param, data, cb) {
      const time = util.formatTime(new Date());
      const outArray = data.toString().replace(/^\s+|\s+$/g, '').split(/\s+/);
      let outValueArray = [];
      for (let i = 0; i < outArray.length; i++) {
          if ((!isNaN(outArray[i]))) {
              outValueArray.push(outArray[i]);
          }
      }
      const ps = {};
      ps.time = time;
      ps.serverId = param.serverId;
      ps.serverType = ps.serverId.split('-')[0];
      ps.pid = param.pid;
      const pid = ps.pid;
      ps.cpuAvg = outValueArray[1];
      ps.memAvg = outValueArray[2];
      ps.vsz = outValueArray[3];
      ps.rss = outValueArray[4];
      outValueArray = [];
      if (process.platform === 'darwin') {
          ps.usr = 0;
          ps.sys = 0;
          ps.gue = 0;
          cb(null, ps);
          return;
      }
      exec(`pidstat -p ${pid}`, (err, output) => {
          if (err) {
              console.error('the command pidstat failed! ', err.stack);
              return;
          }
          const _outArray = output.toString().replace(/^\s+|\s+$/g, '').split(/\s+/);
          for (let i = 0; i < _outArray.length; i++) {
              if ((!isNaN(_outArray[i]))) {
                  outValueArray.push(_outArray[i]);
              }
          }
          ps.usr = outValueArray[1];
          ps.sys = outValueArray[2];
          ps.gue = outValueArray[3];
  
          cb(null, ps);
      });
  }