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解决异常进程占用 CPU 过高的问题

liveJQ
2022-05-20 / 0 评论 / 0 点赞 / 304 阅读 / 2,172 字 / 正在检测是否收录...
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今天发现 Web 页面响应十分缓慢,卡顿严重。上去使用top命令发现有个进程CPU占用过高,负载已经接近临界值了。(16核的机器)

load average: 15.70, 14.27, 13.87

top - 19:05:49 up 35 days, 17:16,  1 user,  load average: 15.70, 14.27, 13.87
Tasks: 378 total,   2 running, 376 sleeping,   0 stopped,   0 zombie
Cpu(s): 99.8%us,  0.2%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.1%si,  0.0%st
Mem:  15428940k total,  2491332k used, 12937608k free,    10944k buffers
Swap:  4194300k total,   403108k used,  3791192k free,   149312k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                    
31755 apache    20   0 86408  40m    8 S 1598.2  0.3  16:43.45 spopqrs                                                                                                                                   
31854 root      20   0  162m 2248 1792 R  1.0  0.0   0:00.76 rrdtool                                                                                                                                     
 1308 root      20   0     0    0    0 S  0.7  0.0  71:01.14 flush-8:0                                                                                                                                   
32052 root      20   0 15304 1572 1008 R  0.3  0.0   0:00.02 top                                                                                                                                         
    1 root      20   0 19232  464  280 S  0.0  0.0   3:02.23 init                                                                                                                                        
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.01 kthreadd                                                                                                                                    
    3 root      RT   0     0    0    0 S  0.0  0.0   0:07.21 migration/0                                                                                                                                 
    4 root      20   0     0    0    0 S  0.0  0.0   0:25.39 ksoftirqd/0                                                                                                                                 
    5 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 stopper/0                                                                                                                                   
    6 root      RT   0     0    0    0 S  0.0  0.0   0:03.06 watchdog/0                                                                                                                                  
    7 root      RT   0     0    0    0 S  0.0  0.0   0:06.46 migration/1                                                                                                                                 
    8 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 stopper/1                                                                                                                                   
    9 root      20   0     0    0    0 S  0.0  0.0   0:10.43 ksoftirqd/1                                                                                                                                 
   10 root      RT   0     0    0    0 S  0.0  0.0   0:05.04 watchdog/1      

根据上面获得的PID,查下看看该进程使用的相关文件,没有用的话就删掉。

[root@livejq ~]# lsof | grep 31755
spopqrs   31755   apache  cwd       DIR                8,3      12288    3933657 /var/www/html/plugins/weathermap/configs
spopqrs   31755   apache  rtd       DIR                8,3       4096          2 /
spopqrs   31755   apache  txt   unknown                                          /proc/31755/exe (readlink: No such file or directory)
spopqrs   31755   apache  mem       REG                8,3    2318020    3408133 /tmp/spopqrs
spopqrs   31755   apache  mem       REG                8,3        528     132315 /etc/localtime
spopqrs   31755   apache    0u      CHR                1,3        0t0       3929 /dev/null
spopqrs   31755   apache    1u      CHR                1,3        0t0       3929 /dev/null
spopqrs   31755   apache    2u      CHR                1,3        0t0       3929 /dev/null
spopqrs   31755   apache    3u     sock                0,6        0t0   19097231 can't identify protocol
spopqrs   31755   apache    4r      REG                0,3          0 4026532035 /proc/stat
spopqrs   31755   apache    5u     IPv4          117412003        0t0        TCP hkhdc.laws.ms:42924->no-data:terabase (ESTABLISHED)
spopqrs   31755   apache    6u      REG                0,9          0       3925 [eventpoll]
spopqrs   31755   apache    7r     FIFO                0,8        0t0  117462586 pipe
spopqrs   31755   apache    8w     FIFO                0,8        0t0  117462586 pipe
spopqrs   31755   apache    9r     FIFO                0,8        0t0  117462587 pipe
spopqrs   31755   apache   10w     FIFO                0,8        0t0  117462587 pipe
spopqrs   31755   apache   11u      REG                0,9          0       3925 [eventfd]
spopqrs   31755   apache   12w      REG                8,3          0    3408134 /tmp/spopqrs.txt
spopqrs   31755   apache   13u      REG                0,9          0       3925 [eventfd]
spopqrs   31755   apache   14u      REG                0,9          0       3925 [eventfd]
spopqrs   31755   apache   15u      REG                0,9          0       3925 [eventfd]
spopqrs   31755   apache   17u     unix 0xffff880075c431c0        0t0   17227580 socket

很明显,上面这个临时文件/tmp/spopqrs跟占用进程的一致,删除后杀掉该进程,这边就恢复正常了。

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