code: private double percentageToGHz(double cpuUsage) {
      cpuUsage /= 100;
      cpuUsage /= ttUtilization.getNumCpu();
      cpuUsage *= ttUtilization.getCpuTotalGHz();
      return cpuUsage;
    }
docs: "ps -eo pcpu" gives per core %. We convert it to GHz