Hi NUMA folks,
I've spotted what appears to be an inconsistency between man numactl and
/proc & /sys.
--physcpubind=cpus, -C cpus
Only execute process on cpus. This accepts physical
cpu numbers as shown in the processor fields of /proc/cpuinfo.
However the processor field of /proc/cpuinfo refers to logical
processors (ie, run queues), not physical ones. Eg:
$ grep processor /proc/cpuinfo
processor : 0
processor : 1
...
Compared to:
$ cat /sys/devices/system/cpu/cpu0/topology/physical_package_id
0
$ cat /sys/devices/system/cpu/cpu1/topology/physical_package_id
0
I.e., CPUs 0 and 1 are clearly on the same physical package.
Futhermore, physical CPU numbers are shown with the string 'physical id'
not 'processor' in /proc/cpuinfo.
Is the numactl man page incorrect, or am I missing something? Does -C
work on physical CPUs but just have bad documentation, or does it mean
logical CPUs per the documentation?
Thanks,
Mike
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