[llvm-bugs] [Bug 27965] New: KMP_TOPOLOGY_METHOD=cpuinfo not always works

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https://llvm.org/bugs/show_bug.cgi?id=27965

            Bug ID: 27965
           Summary: KMP_TOPOLOGY_METHOD=cpuinfo not always works
           Product: OpenMP
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: pawel.osmialowski at foss.arm.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

KMP_TOPOLOGY_METHOD=cpuinfo implementation relies on presence of 'physical id'
field for each computation unit listed in /proc/cpuinfo file. Unfortunately,
this field seems to be x86-specific and is not present on many other
architectures. As a result, OpenMP program started with KMP_TOPOLOGY_METHOD
shell variable set to 'cpuinfo' on non-x86 ends like this:

OMP: Error #129: /proc/cpuinfo, line 8: cpuinfo file missing physical id field
- exiting.

Unfortunately, there's no solution portable across architectures for this. As
this occurs usually on embedded systems with single manycore physical CPU on
board, I'd suggest that in case of absence of 'physical id' field, all
computation units should be pinned to single core (i.e. core 0).

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