code: @Override
  	protected int detectTotalCpuPercent() throws Exception {
  		Process process = null;
  		try {
  
  			// Execute command
  			String cmd;
  			if (command == null || command.isEmpty()) {
  				String os = System.getProperty("os.name").toLowerCase();
  				if (os.indexOf("win") >= 0) {
  
  					// Windows command to query the actual CPU usage
  					cmd = "wmic cpu get loadpercentage";
  
  				} else {
  
  					// Linux command to query the actual CPU usage
  					cmd = "top -b -n2 -p 1 | fgrep \"Cpu(s)\" | tail -1 | awk -F'id,' -v prefix=\"$prefix\" "
  							+ "'{ split($1, vs, \",\"); v=vs[length(vs)]; sub(\"%\", \"\", v); printf \"%s%.1f%%\n\", prefix, 100 - v }'";
  				}
  			} else {
  				cmd = command;
  			}
  			process = Runtime.getRuntime().exec(cmd);
  			BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
  			StringBuilder tmp = new StringBuilder();
  			String line = "";
  			while ((line = reader.readLine()) != null) {
  				tmp.setLength(0);
  				char[] chars = line.toCharArray();
  				for (char c : chars) {
  					if (Character.isDigit(c)) {
  						tmp.append(c);
  					}
  					if (c == ',' || c == '.') {
  						tmp.append('.');
  					}
  				}
  				if (tmp.length() > 0) {
  					try {
  						return (int) Double.parseDouble(tmp.toString());
  					} catch (Exception ignored) {
  					}
  				}
  			}
  		} finally {
  			if (process != null) {
  				try {
  					process.destroy();
  				} catch (Exception ignored) {
  				}
  			}
  		}
  		return 0;
  	}
docs: Returns the system CPU usage, in percents, between 0 and 100.
  
  @return total CPU usage of the current OS