乘客身份没有显示内存使用情况？

Question

我在Ubuntu 16.04上运行nginx / passenger，它工作正常，但由于某种原因，package com.demo.json; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.net.URL; import java.nio.charset.Charset; import org.json.JSONException; import org.json.JSONObject; import org.json.simple.JSONArray; public class ReadJSON { private static String readAll(Reader rd) throws IOException { StringBuilder sb = new StringBuilder(); int cp; while ((cp = rd.read()) != -1) { sb.append((char) cp); } return sb.toString(); } public static JSONObject readJsonFromUrl(String url) throws IOException, JSONException { InputStream is = new URL(url).openStream(); try { BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); String jsonText = readAll(rd); JSONObject json = new JSONObject(jsonText); return json; } finally { is.close(); } } public static void main(String[] args) throws IOException, JSONException { JSONObject json = readJsonFromUrl("http://10.11.123.12:8001/json/testing/agency.json"); JSONArray agenciesArray = (JSONArray) json.get("agency"); for (int i=0; i<agenciesArray.size(); i++) { agenciesArray.get(i); } } } 对于cpu和内存都显示为零。如果我使用passenger-status运行它没有任何区别。有没有其他人见过这个？