背景：项目遇到卡死情况，CPU满负荷，但内存占用率并不高，业务也不复杂。
思路：
参考：
ps + top + jstack
https://liuyueyi.github.io/hexblog/2018/07/11/180711-JVM%E5%AE%9A%E4%BD%8D%E5%88%86%E6%9E%90CPU%E6%80%A7%E8%83%BD%E6%B6%88%E8%80%97/
https://www.jianshu.com/p/a75c1253fc11
https://blog.csdn.net/weixin_42358261/article/details/112077810
https://www.cnblogs.com/gyjx2016/p/11168273.html
https://my.oschina.net/weiweiblog/blog/3098178
https://blog.csdn.net/syc000666/article/details/106544096
https://blog.csdn.net/qq_30353203/article/details/76690272?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-1.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-1.control
jvisual.exe
https://www.cnblogs.com/jhxxb/p/13279201.html