Linux下服务器CPU过高的诊断

淩亂°似流年 2022-08-23 03:50 177阅读 0赞

Weblogic非常耗CPU的时候，如何知道是什么在耗性能？

**1.先用top看进程的消耗，记录下消耗高的进程pid**

**2.先用top -Hp pid(进程id) 看线程的消耗**

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND  
14537 weblogic  20   0 26.0g 9.3g  11m R 41.8  7.4  56:21.87 java  
14530 weblogic  20   0 26.0g 9.3g  11m R 40.5  7.4  56:35.16 java  
14535 weblogic  20   0 26.0g 9.3g  11m R 40.2  7.4  56:38.38 java   
14541 weblogic  20   0 26.0g 9.3g  11m R 39.2  7.4  56:28.74 java   
14546 weblogic  20   0 26.0g 9.3g  11m R 39.2  7.4  56:48.28 java   
14526 weblogic  20   0 26.0g 9.3g  11m R 38.8  7.4  56:28.37 java   
14528 weblogic  20   0 26.0g 9.3g  11m R 38.8  7.4  56:26.32 java   
14534 weblogic  20   0 26.0g 9.3g  11m R 38.8  7.4  56:30.50 java   
14536 weblogic  20   0 26.0g 9.3g  11m R 38.5  7.4  56:32.87 java   
14531 weblogic  20   0 26.0g 9.3g  11m R 38.2  7.4  56:48.41 java   
14525 weblogic  20   0 26.0g 9.3g  11m R 37.5  7.4  56:32.14 java   
14539 weblogic  20   0 26.0g 9.3g  11m R 37.5  7.4  56:32.48 java   
14542 weblogic  20   0 26.0g 9.3g  11m R 36.9  7.4  56:33.60 java   
14527 weblogic  20   0 26.0g 9.3g  11m R 36.5  7.4  56:31.93 java   
14543 weblogic  20   0 26.0g 9.3g  11m R 36.5  7.4  56:29.06 java    
14532 weblogic  20   0 26.0g 9.3g  11m R 35.9  7.4  56:35.01 java    
14533 weblogic  20   0 26.0g 9.3g  11m R 35.5  7.4  56:27.61 java   
14544 weblogic  20   0 26.0g 9.3g  11m R 35.5  7.4  56:29.22 java    
14545 weblogic  20   0 26.0g 9.3g  11m R 35.5  7.4  56:34.25 java    
14540 weblogic  20   0 26.0g 9.3g  11m R 34.5  7.4  56:43.82 java    
14524 weblogic  20   0 26.0g 9.3g  11m R 33.9  7.4  56:29.71 java     
14538 weblogic  20   0 26.0g 9.3g  11m R 33.9  7.4  56:26.12 java    
14529 weblogic  20   0 26.0g 9.3g  11m R 32.9  7.4  56:19.01 java

**..........................省略若干行...................................**

**3.刚才记录消耗高的进程pid，然后使用jstack   pid 得到thread dump**

**......................省略若干行.......................................**

"VM Thread" prio=10 tid=0x00007f10ac094800 nid=0x38d3 runnable   
"GC task thread\#0 (ParallelGC)" prio=10 tid=0x00007f10ac01f800 nid=0x38bc runnable   
"GC task thread\#1 (ParallelGC)" prio=10 tid=0x00007f10ac021800 nid=0x38bd runnable   
"GC task thread\#2 (ParallelGC)" prio=10 tid=0x00007f10ac023800 nid=0x38be runnable   
"GC task thread\#3 (ParallelGC)" prio=10 tid=0x00007f10ac025000 nid=0x38bf runnable   
"GC task thread\#4 (ParallelGC)" prio=10 tid=0x00007f10ac027000 nid=0x38c0 runnable  
"GC task thread\#5 (ParallelGC)" prio=10 tid=0x00007f10ac029000 nid=0x38c1 runnable  
"GC task thread\#6 (ParallelGC)" prio=10 tid=0x00007f10ac02b000 nid=0x38c2 runnable   
"GC task thread\#7 (ParallelGC)" prio=10 tid=0x00007f10ac02c800 nid=0x38c3 runnable  
"GC task thread\#8 (ParallelGC)" prio=10 tid=0x00007f10ac02e800 nid=0x38c4 runnable   
"GC task thread\#9 (ParallelGC)" prio=10 tid=0x00007f10ac030800 nid=0x38c5 runnable  
"GC task thread\#10 (ParallelGC)" prio=10 tid=0x00007f10ac032000 nid=0x38c6 runnable  
"GC task thread\#11 (ParallelGC)" prio=10 tid=0x00007f10ac034000 nid=0x38c7 runnable  
"GC task thread\#12 (ParallelGC)" prio=10 tid=0x00007f10ac036000 nid=0x38c8 runnable   
"GC task thread\#13 (ParallelGC)" prio=10 tid=0x00007f10ac038000 nid=0x38c9 runnable

**4. 对应top -Hp pid(进程id)的线程id和jstack pid中的nid**

如 十进制14537 转成十六进制38c9，十进制14524转成十六进制38bc 。