分析线上cpu或内存过高问题（参考）

朱雀 2023-02-23 05:02 53阅读 0赞

1、top命令查询linux所有进程，占用cpu或内存情况

top

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ_size_16_color_FFFFFF_t_70][]2、比如上面的java进程占用多，pid是 3995

使用  top -Hp 3995命令，

查看该进程下面，线程的情况，使用 shift+m按照内存，或者shift+p，按照cpu使用排序情况如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ_size_16_color_FFFFFF_t_70 1][]

3、查看具体线程占用情况

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ_size_16_color_FFFFFF_t_70 2][]

4、使用printf '%x\\n' PID (PID为上一步中获取到的线程号)转换成对应的16进制PID

printf '%x\\n' 4064

![20200705134244627.png][]

5、jstack 线程pid | grep 进程16进制

jstack 3995|grep fe0

生成该线程堆栈信息，查看原因：

![20200705134358852.png][]

参考博客：

[https://blog.csdn.net/notsaltedfish/article/details/80209538?utm\_medium=distribute.pc\_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase&depth\_1-utm\_source=distribute.pc\_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase][https_blog.csdn.net_notsaltedfish_article_details_80209538_utm_medium_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase_depth_1-utm_source_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase]

[https://juejin.im/post/5d25f1d6f265da1b7638caaf][https_juejin.im_post_5d25f1d6f265da1b7638caaf]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200705132942710.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200705133124950.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200705133414726.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlanVzdGRvaXQ=,size_16,color_FFFFFF,t_70
[20200705134244627.png]: https://img-blog.csdnimg.cn/20200705134244627.png
[20200705134358852.png]: https://img-blog.csdnimg.cn/20200705134358852.png
[https_blog.csdn.net_notsaltedfish_article_details_80209538_utm_medium_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase_depth_1-utm_source_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase]: https://blog.csdn.net/notsaltedfish/article/details/80209538?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-4.nonecase
[https_juejin.im_post_5d25f1d6f265da1b7638caaf]: https://juejin.im/post/5d25f1d6f265da1b7638caaf