@wendal 我是在Windows下跑的，然后通过任务管理器看的

@wendal 不好意思久等了

C:\Users\Administrator>jmap -heap 8832
Attaching to process ID 8832, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.131-b11

using thread-local object allocation.
Parallel GC with 4 thread(s)

Heap Configuration:
   MinHeapFreeRatio         = 0
   MaxHeapFreeRatio         = 100
   MaxHeapSize              = 1073741824 (1024.0MB)
   NewSize                  = 178782208 (170.5MB)
   MaxNewSize               = 357564416 (341.0MB)
   OldSize                  = 358088704 (341.5MB)
   NewRatio                 = 2
   SurvivorRatio            = 8
   MetaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxMetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage:
PS Young Generation
Eden Space:
   capacity = 127401984 (121.5MB)
   used     = 119145672 (113.62616729736328MB)
   free     = 8256312 (7.873832702636719MB)
   93.51947925708912% used
From Space:
   capacity = 24117248 (23.0MB)
   used     = 16473000 (15.709877014160156MB)
   free     = 7644248 (7.290122985839844MB)
   68.30381310504416% used
To Space:
   capacity = 25690112 (24.5MB)
   used     = 0 (0.0MB)
   free     = 25690112 (24.5MB)
   0.0% used
PS Old Generation
   capacity = 358088704 (341.5MB)
   used     = 13603824 (12.973617553710938MB)
   free     = 344484880 (328.52638244628906MB)
   3.799009532565428% used

8843 interned Strings occupying 767360 bytes.

@wendal

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.socket.client.IO;
import io.socket.client.Socket;
import io.socket.emitter.Emitter;

这些算是nio吗，我刚刚查了一下资料还是不太确定？？？

看到了有资料说在java API中提供了两套NIO，一套是针对标准输入输出NIO，另一套就是网络编程NIO，我的这个又引用了Buffer操作，又引入了socket操作算是引入了两套nio了吗
@wendal

好的

@wendal 我使用了mat看到那个饼状图显示了我的程序才占了一点点，remainder占的超过90%多，Histogram显示我的Thread线程对象已经起到5000了，第一次使用这个东西，看了网上一些人的介绍，不怎么会分析，不知道是不是看错了

为什么他们占的内存那么少但是，内存的使用量却一直蹭蹭的往上跑，对我就是要创这么多线程，用了ExecutorService定义了线程池了，然后要跑完我才通过shutdown和shutdownnow关闭掉线程池的，只是想测一下为什么设置了-Xmx这个参数为什么不起效果，所以疯狂建了这么多线程