2011年3月8日星期二

High CPU when upstream server down

Nginx goes to nearly 100% CPU when I take down my upstream servers
(gunicorn). Has anybody heard of this as an issue?


$ nginx -v
nginx version: nginx/0.7.67
$ uname -a
Linux ip-10-242-226-66 2.6.35-27-virtual #48-Ubuntu SMP Tue Feb 22
23:09:12 UTC 2011 i686 GNU/Linux


Summary of top:

top - 20:10:17 up 1 day, 29 min, 4 users, load average: 1.11, 0.83,
0.56
Tasks: 79 total, 2 running, 77 sleeping, 0 stopped, 0 zombie
Cpu(s): 6.4%us, 36.9%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si,
56.7%st
Mem: 1705708k total, 442308k used, 1263400k free, 91240k
buffers
Swap: 917500k total, 0k used, 917500k free, 249920k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND

30663 www-data 20 0 5492 1944 916 R 99.9 0.1 5:26.32 nginx

1 root 20 0 2848 1652 1216 S 0.0 0.1 0:00.47 init

2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd

3 root 20 0 0 0 0 S 0.0 0.0 0:03.74 ksoftirqd/0

4 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0

5 root RT 0 0 0 0 S 0.0 0.0 0:00.20 watchdog/0

6 root 20 0 0 0 0 S 0.0 0.0 0:01.91 events/0

7 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuset

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,181397,181397#msg-181397


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