core id repeated on Opteron 6100 processors

[thomh]

The Opteron 6100 series are physically two multi-core CPUs on the same socket and the "core id:" field in cpuinfo is reused between CPUs, resulting in VanillaCpuLayout.fromCpuInfo() incorrectly counting them as multiple thread units for the same core.

Contents of /proc/cpuinfo: https://gist.github.com/2209193

[peter-lawrey]

Can you see a way to tell that are different cores and not different threads on the same core? It appears to me that the cpuinfo is incorrect. :P

[thomh]

It's certainly not sufficient for your purpose, anyway. I've had better luck using hwloc/lstopo from OpenMPI to get physical layout information, maybe you could leverage that somehow instead?

[peter-lawrey]

Do you have any example code or references for these functions?

[peter-lawrey]

BTW: You can provide your own "cpuinfo" file which contains the information which needs to be there.