How do I determine if my x86-compatible Intel system is multi-processor, multi-core or supports hyperthreading?

Guys,

We need to know about multi-processor, multi-core or supports hyperthreading. Here are the details :

Physical ID (Physical processor or socket ID): The physical id value is a number assigned to each processor socket. The number of unique physical id values on a system tells you the number of CPU sockets that are in use. All logical processors (cores or hyperthreaded images) contained within the same physical processor will share the same physical id value.

Siblings (ie chield , logical processor): The siblings value tells you how many logical processors are provided by each physical processor.

Core ID (Core ID value) : The core id values are numbers assigned to each physical processor core. Systems with hyperthreading will see duplications in this value as each hyperthreaded image is part of a physical core. Under Red Hat Enterprise Linux 5, these numbers are an index within a particular CPU socket so duplications will also occur in multi-socket systems. Under Red Hat Enterprise Linux 4, which uses APIC IDs to assign core id values, these numbers are not reused between sockets so any duplications seen will be due solely to hyperthreading.

Core value (Number of core value ie how many core can be combined in one logical processor) : The cpu cores value tells you how many physical cores are provided by each physical processor.

Thread (Each core can contain max 2 threads in Intel arch) : Number of threads.

Above all can be viewed in /proc/cpuinfo and dmidecode.

Example from my laptop :

demidecode :

Handle 0x0006, DMI type 4, 42 bytes
Processor Information
Socket Designation: None
Type: Central Processor
Family: Other
Manufacturer: GenuineIntel
ID: 55 06 02 00 FF FB EB BF
Version: Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz
Voltage: 1.3 V
External Clock: 133 MHz
Max Speed: 2530 MHz
Current Speed: 2530 MHz
Status: Populated, Enabled
Upgrade: None
L1 Cache Handle: 0x000A
L2 Cache Handle: 0x000B
L3 Cache Handle: 0x000C
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Core Count: 2 < Core Enabled: 2 << enabled core
Thread Count: 4 << 2*2(each core contains 2 thread in intel arch) =4
Characteristics: None

---

cat /proc/cpuinfo :

[root@kmaiti ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz
stepping : 5
cpu MHz : 1199.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat tpr_shadow vnmi flexpriority ept vpid
bogomips : 5054.00
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz
stepping : 5
cpu MHz : 1199.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat tpr_shadow vnmi flexpriority ept vpid
bogomips : 5053.76
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz
stepping : 5
cpu MHz : 1199.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 2
apicid : 4
initial apicid : 4
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat tpr_shadow vnmi flexpriority ept vpid
bogomips : 5053.76
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz
stepping : 5
cpu MHz : 1199.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 2
apicid : 5
initial apicid : 5
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm ida arat tpr_shadow vnmi flexpriority ept vpid
bogomips : 5053.76
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

Try:)