erlang:system_info(cpu_topology) strange behavior

[Frank Muller]

Answering my own question.

The second attempt worked because I was under “root”.

Attaching to the release with -remsh failed because the node was running
under user “orca” which has less privileges.

Is this an expected behavior?

/Frank

Frank<frank.muller.erl@REDACTED>

> Hi guys,
>
> When I attached (-remsh) to my release application (/opt/orca), this call
> returns undefined:
>
> (orca@REDACTED)1> erlang:system_info(cpu_topology).
> undefined
>
> If try this instead, the call seems to work as expected:
>
> $ /opt/orca/erts-10.7.2.4/bin/erl
> 1> erlang:system_info(cpu_topology).
> [{processor,[{core,[{thread,{logical,0}},
>                     {thread,{logical,4}}]},
>              {core,[{thread,{logical,1}},{thread,{logical,5}}]},
>              {core,[{thread,{logical,2}},{thread,{logical,6}}]},
>              {core,[{thread,{logical,3}},{thread,{logical,7}}]}]}]
>
>
> I’m on Ubuntu16 LTS kernel 4.4.0, Erlang 22.3.4.11.
>
> Help appreciated
>
> /Frank
>
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