CPU and Cores information Post: 302990514

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Operating Systems Linux Red Hat CPU and Cores information Post 302990514 by Corona688 on Friday 27th of January 2017 11:51:06 AM

01-27-2017

Registered User

Quote:

Originally Posted by piccolinomax

2. I insert the command [code]more /proc/cpuinfo[/icode] and the answer is

Code:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 44
model name      : Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz
stepping        : 2
cpu MHz         : 2400.086
cache size      : 12288 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc ida arat pni est ssse
3 cx16 sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 6002.38
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

...

This is completely different than before, did you run it on the wrong machine?

Anyway, I've highlighted the hyperthreading tag in red. This means half the cores are just artifacts of how an OS handles hyperthreading, and not real cores. So this is a 4-core system, not eight.

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papi_hw_info_t

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)