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Why are processors seemingly so active on an Ubuntu 20.04 Server with no appreciable services running in an LXC container?

bd flag
ylluminate

On a minimal Ubuntu 20.04 server that's just been set up (and with some services disabled), I'm finding that htop is conveying that there's more processor activity going on than what I figure should be happening and I'm not sure if (in this unprivileged LXC container) it's picking up activity from other peer virtual machines and containers or if Ubuntu is just behaving very badly.

Here's a short screencast to illustrate: screen capture

I have 16 cores (out of 24 on the server) assigned to this LXC ct.

htop is at version 2.2.0.

config file contents:

lxc.cgroup.relative = 0
lxc.cgroup.dir.monitor = lxc.monitor/101
lxc.cgroup.dir.container = lxc/101
lxc.cgroup.dir.container.inner = ns
lxc.arch = amd64
lxc.include = /usr/share/lxc/config/ubuntu.common.conf
lxc.include = /usr/share/lxc/config/ubuntu.userns.conf
lxc.seccomp.profile = /var/lib/lxc/101/rules.seccomp
lxc.apparmor.profile = generated
lxc.apparmor.allow_nesting = 1
lxc.mount.auto = sys:mixed
lxc.monitor.unshare = 1
lxc.idmap = u 0 100000 65536
lxc.idmap = g 0 100000 65536
lxc.tty.max = 2
lxc.environment = TERM=linux
lxc.uts.name = HOSTNAME
lxc.cgroup2.memory.max = 25769803776
lxc.cgroup2.memory.swap.max = 17179869184
lxc.rootfs.path = /var/lib/lxc/101/rootfs
lxc.net.0.type = veth
lxc.net.0.veth.pair = veth101i0
lxc.net.0.hwaddr = 14:5A:59:1A:BA:25
lxc.net.0.name = eth0
lxc.net.0.script.up = /usr/share/lxc/lxcnetaddbr
lxc.cgroup2.cpuset.cpus = 0-1,3,5,7,9-11,13,15-19,21-22
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James S. avatar
de flag
James S.
Do you have sixteen cores assigned to your container? What version of htop are you running? post your container config?
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bd flag
ylluminate
@JamesS. modified question as requested.
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James S. avatar
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James S.
You're running a *16*core container with *24G*RAM? out of curiosity, what are you running in that beast?
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bd flag
ylluminate
Just testing it out, but probably PostgreSQL.
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James S. avatar
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James S.
:D savage. Is your container a *full* 20.04 environment, with shells and services and whatnot, or is it stripped bare as one would expect in say, a Docker image?
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bd flag
ylluminate
It is the default that comes from the LXC image from Proxmox which in turn comes from https://images.linuxcontainers.org/. So yeah, it's a minimal install as you can see, but I just enabled SSHd on it and can do anything - including run a GUI if I wanted to.
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James S. avatar
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James S.
I mean, if you're looking at htop already, what does it show you when you F6 and sort by CPU%?
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bd flag
ylluminate
@JamesS. that's the view I'm giving there in my short screencast... :)
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James S. avatar
de flag
James S.
LOL sure enough, sorry. Anyhow, I'm not sure I can help much - this is a very weird container. I'm much more used to many, *MANY* very tiny ones (<25MB) doing *exactly one thing* while this seems to be a full-fledged OS environment, with services and schedulers
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