java8使用Memory Analyzer大概是10左右的版本，用最新版本要java17

MemoryAnalyzer-1.10.0.20200225-win32.win32.x86_64

MAT(Memory Analyzer Tool)下载

https://www.cnblogs.com/zwh0910/p/15774590.html

Eclipse downloads - Select a mirror | The Eclipse Foundation

Eclipse Memory Analyzer Open Source Project | The Eclipse Foundation

Memory Analyzer使用教程 - 掘金

问题处理参考

记录flink taskmanager 生产环境 unable to create new native thread · 语雀

sudo vi /etc/security/limits.d/20-nproc.conf
*          soft    nproc     unlimited
root       soft    nproc     unlimited
*          hard    nproc     unlimited
root       hard    nproc     unlimited

ulimit -u
ulimit -u 65535
vi ~/.bash_profile
vi ~/.bashrc
~/.bash_profile 是交互式、login 方式进入 bash 运行的
~/.bashrc 是交互式 non-login 方式进入 bash 运行的
source ~/.bash_profile

sudo vi /etc/security/limits.conf
* soft nproc 65535
* hard nproc 65535


# 通过端口号确定进程号
netstat -tnlp |grep 52345

# 通过进程ID拉取dump
jmap -dump:format=b,file=~/flink-taskmanager.hprof 进程ID

国外文章

Troubleshoot OutOfMemoryError: Unable to Create New Native Thread - DZone

There is no room in the memory to accommodate new threads.
The number of threads exceeds the Operating System limit.

在线内存分析使用

高逼格可视化在线内存分析工具(Java Memory Head Dump Analyzer Tool）_在线分析dump_帅帅的Max的博客-CSDN博客

flink任务内存调优，TaskManager、JobManager内存配置_flink内存调优_大数据动物园的博客-CSDN博客

使用教程

https://www.cnblogs.com/trust-freedom/p/6744948.html

使用测试 

public class OOMHeapTest {
    public static void main(String[] args){
        oom();
    }

    private static void oom(){
        Map<String, OOMBean> map = new HashMap<String, OOMBean>();
        Object[] array = new Object[1000000];
        for(int i=0; i<1000000; i++){
            String d = new Date().toString();
            OOMBean o = new OOMBean(d, i);
            map.put(i+"_oom", o);
            array[i] = o;
        }
    }

    private static class OOMBean {
        private String d;
        private Integer i;
        public OOMBean(String d, int i) {
            d=d;
            i=i;
        }
    }
}

jvm参数设置

-Xms10m  -Xmx10m  -XX:+HeapDumpOnOutOfMemoryError

生成文件如下

 

用MA加载得到