[lxc-users] lxd process using lots of CPU
Stéphane Graber
stgraber at ubuntu.com
Thu Mar 9 16:52:43 UTC 2017
On Thu, Mar 09, 2017 at 11:01:34PM +0900, Tomasz Chmielewski wrote:
> On a server with several ~idlish containers:
>
>
> PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
> 19104 root 20 0 2548M 44132 15236 S 140. 0.0 58h03:17 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 24966 root 20 0 2548M 44132 15236 S 18.2 0.0 2h45:36 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19162 root 20 0 2548M 44132 15236 S 17.5 0.0 3h31:49 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19120 root 20 0 2548M 44132 15236 S 16.2 0.0 3h16:11 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19244 root 20 0 2548M 44132 15236 S 11.0 0.0 1h48:56 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19123 root 20 0 2548M 44132 15236 S 11.0 0.0 3h34:42 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19243 root 20 0 2548M 44132 15236 S 10.4 0.0 1h06:13 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 14962 root 20 0 2548M 44132 15236 R 10.4 0.0 3h17:27 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19356 root 20 0 2548M 44132 15236 S 9.7 0.0 2h16:44 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19161 root 20 0 2548M 44132 15236 R 9.7 0.0 1h26:40 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19126 root 20 0 2548M 44132 15236 R 9.1 0.0 22:11.20 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 19115 root 20 0 2548M 44132 15236 R 8.4 0.0 2h55:21 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
> 693 root 20 0 2548M 44132 15236 R 8.4 0.0 2h28:02 /usr/bin/lxd
> --group lxd --logfile=/var/log/lxd/lxd.log
>
>
> That's actually one lxd process with many threads; view from htop.
>
> Expected?
>
> ii liblxc1 2.0.7-0ubuntu1~16.04.1
> amd64 Linux Containers userspace tools (library)
> ii lxc-common 2.0.7-0ubuntu1~16.04.1
> amd64 Linux Containers userspace tools (common tools)
> ii lxcfs 2.0.6-0ubuntu1~16.04.1
> amd64 FUSE based filesystem for LXC
> ii lxd 2.0.9-0ubuntu1~16.04.2
> amd64 Container hypervisor based on LXC - daemon
> ii lxd-client 2.0.9-0ubuntu1~16.04.2
> amd64 Container hypervisor based on LXC - client
>
>
>
> strace of the process mainly shows:
>
> [pid 19124] poll([{fd=28, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19120] poll([{fd=13, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19124] <... poll resumed> ) = 1 ([{fd=28, revents=POLLNVAL}])
> [pid 19120] <... poll resumed> ) = 1 ([{fd=13, revents=POLLNVAL}])
> [pid 19124] poll([{fd=28, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19120] poll([{fd=13, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19124] <... poll resumed> ) = 1 ([{fd=28, revents=POLLNVAL}])
> [pid 19120] <... poll resumed> ) = 1 ([{fd=13, revents=POLLNVAL}])
> [pid 19124] poll([{fd=28, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19120] poll([{fd=13, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19124] <... poll resumed> ) = 1 ([{fd=28, revents=POLLNVAL}])
> [pid 19120] <... poll resumed> ) = 1 ([{fd=13, revents=POLLNVAL}])
> [pid 19124] poll([{fd=28, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19120] poll([{fd=13, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19124] <... poll resumed> ) = 1 ([{fd=28, revents=POLLNVAL}])
> [pid 19120] <... poll resumed> ) = 1 ([{fd=13, revents=POLLNVAL}])
> [pid 19124] poll([{fd=28, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19120] poll([{fd=13, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19124] <... poll resumed> ) = 1 ([{fd=28, revents=POLLNVAL}])
> [pid 19120] <... poll resumed> ) = 1 ([{fd=13, revents=POLLNVAL}])
> [pid 19124] poll([{fd=28, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
> [pid 19120] poll([{fd=13, events=POLLIN|POLLPRI|POLLERR|POLLHUP|0x2000}], 1,
> -1 <unfinished ...>
>
>
> Tomasz Chmielewski
> https://lxadm.com
Do you see a flood of events if you run "lxc monitor --type=logging"?
--
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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