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Special Forums Hardware Hyperthreaded virtual cores, different C-States? Post 302922388 by agentrnge on Friday 24th of October 2014 10:08:55 AM
Old 10-24-2014
Hyperthreaded virtual cores, different C-States?

turbostat reports C-states of all CPU cores, and includes entries for each hyper-threaded core as well. Often enough the two logical cores on a single physical core will list different C state percentages. Does that make any sense?

Is this reporting the c-states of the few duplicated parts that support hyperthreading, vs the actual computing units in the single physical core?

This isn't a turbostat specific question, that just happens to be the tool I used to display that info. Its more a question about hyperthreading in general.
Edit: CPU is an Intel 5820K hexacore if that matters. Its my first hyperthreaded CPU.

Last edited by agentrnge; 10-24-2014 at 11:21 AM..
 

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PAPI_hw_info_t(3)						       PAPI							 PAPI_hw_info_t(3)

NAME
PAPI_hw_info_t - Hardware info structure. SYNOPSIS
Data Fields int ncpu int threads int cores int sockets int nnodes int totalcpus int vendor char vendor_string [128] int model char model_string [128] float revision int cpuid_family int cpuid_model int cpuid_stepping int cpu_max_mhz int cpu_min_mhz PAPI_mh_info_t mem_hierarchy int virtualized char virtual_vendor_string [128] char virtual_vendor_version [128] float mhz int clock_mhz int reserved [8] Field Documentation int PAPI_hw_info_t::clock_mhz Deprecated int PAPI_hw_info_t::cores Number of cores per socket int PAPI_hw_info_t::cpu_max_mhz Maximum supported CPU speed int PAPI_hw_info_t::cpu_min_mhz Minimum supported CPU speed int PAPI_hw_info_t::cpuid_family cpuid family int PAPI_hw_info_t::cpuid_model cpuid model int PAPI_hw_info_t::cpuid_stepping cpuid stepping PAPI_mh_info_t PAPI_hw_info_t::mem_hierarchy PAPI memory heirarchy description float PAPI_hw_info_t::mhz Deprecated int PAPI_hw_info_t::model Model number of CPU char PAPI_hw_info_t::model_string[128] Model string of CPU int PAPI_hw_info_t::ncpu Number of CPUs per NUMA Node int PAPI_hw_info_t::nnodes Total Number of NUMA Nodes float PAPI_hw_info_t::revision Revision of CPU int PAPI_hw_info_t::sockets Number of sockets int PAPI_hw_info_t::threads Number of hdw threads per core int PAPI_hw_info_t::totalcpus Total number of CPUs in the entire system int PAPI_hw_info_t::vendor Vendor number of CPU char PAPI_hw_info_t::vendor_string[128] Vendor string of CPU char PAPI_hw_info_t::virtual_vendor_string[128] Vendor for virtual machine char PAPI_hw_info_t::virtual_vendor_version[128] Version of virtual machine int PAPI_hw_info_t::virtualized Running in virtual machine Author Generated automatically by Doxygen for PAPI from the source code. Version 5.2.0.0 Tue Jun 17 2014 PAPI_hw_info_t(3)
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