Hey I'm having a weird issue that I'm having some difficulty diagnosing. I have a VM that went down due to high CPU usage today. The websites on this VM are very low traffic, so I knew something unusual was at play. I ran several basic diagnostic commands and determined that a User Process(es) was using excessive CPU. So then I ran top, and found something unusual. While my CPU usage is being reported high for User Processes, the top processes are all using surprisingly little CPU. I'm having difficulty pinpointing the issue without a clear focus.
Here are the first several lines of the top output:
Tasks: 117 total, 2 running, 115 sleeping, 0 stopped, 0 zombie
Cpu0 : 73.1%us, 10.0%sy, 0.0%ni, 16.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 84.7%us, 10.3%sy, 0.0%ni, 4.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.3%st
Mem: 2054472k total, 622260k used, 1432212k free, 59960k buffers
Swap: 0k total, 0k used, 0k free, 237724k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5926 bay 20 0 161m 18m 5384 R 2.7 0.9 0:00.08 php
1482 mysql 20 0 932m 42m 5996 S 2.3 2.1 0:04.79 mysqld
3197 nobody 20 0 71824 3788 1628 S 0.3 0.2 0:00.09 httpd
1 root 20 0 19232 1488 1220 S 0.0 0.1 0:00.59 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
4 root 20 0 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
6 root RT 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
7 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
As you can see the processes listed come nowhere near the 73/84% CPU usage. Any ideas as to how I can see these missing processes or how I can better pinpoint my issue? Thanks a lot guys!
