cpu100%问题定位

太过爱你忘了你带给我的痛 2023-07-12 05:24 8阅读 0赞

# cpu100%问题定位 #

程序中写一个死循环

thread = new Thread(() -> { 
    			while (true) { 
    
    			}
    		});
    		thread.start();

top -c显示进程运行详细列表

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70]

键入P可以按照cpu使用率排序

可以用top -p pid定位到当前进程

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70 1]

按H，切换到线程，这时显示的是一个进程的线程信息表，这时左上角显示的Threads

![在这里插入图片描述][20200307135126837.png]

也可以不定位到当前进程，直接按H切换到线程，显示系统中所有线程

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70 2]

可以看到线程id为1626，把线程id转换成16进制

[xuhaixing@xhx190 ~]$ printf "%x\n" 1626
    65a

进程id为1611，本机进程id与vmid相同，然后用jstack命令可以查看到运行的线程的信息

[xuhaixing@xhx190 ~]$ jstack 1611
    xxxx
    "Thread-2" #14 prio=5 os_prio=0 tid=0x00007f440caf0800 nid=0x65a runnable [0x00007f43f5925000]
       java.lang.Thread.State: RUNNABLE
    	at com.xhx.spring.springoom.SpringOomApplication.lambda$afterPropertiesSet$0(SpringOomApplication.java:33)
    	at com.xhx.spring.springoom.SpringOomApplication$$Lambda$363/1477657879.run(Unknown Source)
    	at java.lang.Thread.run(Thread.java:748)
    
    "container-0" #13 prio=5 os_prio=0 tid=0x00007f440c8f4800 nid=0x659 waiting on condition [0x00007f43f651f000]
       java.lang.Thread.State: TIMED_WAITING (sleeping)
    	at java.lang.Thread.sleep(Native Method)
    	at org.apache.catalina.core.StandardServer.await(StandardServer.java:570)
    	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer$1.run(TomcatWebServer.java:181)
    xxxx

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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70 3]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200307135105448.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200307135115301.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI=,size_16,color_FFFFFF,t_70
[20200307135126837.png]: https://img-blog.csdnimg.cn/20200307135126837.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200307135134138.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200307132829764.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTIzMjY0NjI=,size_16,color_FFFFFF,t_70