Why different CPU count from nproc and nproc --all in OpenVZ container?

Question

I'm trying nproc and nproc --all in an OpenVZ container to count the number of CPU threads assigned to the vps by upstream provider. While nproc resulting 1, nproc --all resulting 24 CPU threads. May anyone please help me in explaining this?

The upstream provider is supposed to assign only one CPU and cat /proc/cpuinfo is also saying that. Then from where and how this 24 is coming?

Please find a screenshot here https://prnt.sc/hfzeuw. I'm using CentOS 7 inside the vps.

score 3 · Accepted Answer · edited Apr 16 '19 at 13:36

3

They are using a 12 core proc with hyperthreading, most likely. They have assigned one of these threads to your container.

From the man page:

   nproc - print the number of processing units available

   nproc [OPTION]...

   --all  print the number of installed processors`

EDIT:

What happens when you type the following:

[user@host]$ getconf _NPROCESSORS_ONLN

?

edited Apr 16 '19 at 13:36

Rui F Ribeiro

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answered Nov 27 '17 at 19:26

kilrainebc

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`getconf _NPROCESSORS_ONLN` returning to 1 – Abhik Bose Nov 27 '17 at 19:38
As anticipated it is showing the one (1) you have avail. Are you familiar with containers? If you'd like to learn more, I suggest reading: https://en.wikipedia.org/wiki/OpenVZ – kilrainebc Nov 27 '17 at 19:53
More than happy! :) Good luck! – kilrainebc Nov 27 '17 at 20:27

Why different CPU count from nproc and nproc --all in OpenVZ container?

1 Answers1