The following schemes are used to identify logical processors in a system:
System-defined logical enumeration
Topological enumeration based on three-level hierarchical identification through triplets (package/socket, core, thread)
The number of a logical CPU is defined as the corresponding position of this CPU bit in the kernel affinity bit-mask. Use the
utility, provided with your Intel MPI Library installation
command to find out the logical CPU numbers.
The three-level hierarchical identification uses triplets that provide information about processor location and their order. The triplets are hierarchically ordered (package, core, and thread).
See the example for one possible processor numbering where there are two sockets, four cores (two cores per socket), and eight logical processors (two processors per core).
Logical and topological enumerations are not the same.
utility to identify the correspondence between the logical and topological enumerations. See
Processor Information Utility
for more details.