See CPU physical and logical numbers under Linux

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2. [Email protected]:~$ cat/proc/cpuinfo
4. processor:0
6. Vendor_id:genuineintel
8. CPU Family:15
10. Model:2
12. Model Name:intel (R) Pentium (r) 4 CPU 3.00GHz
14. Stepping:9
16. microcode:0x17
18. CPU mhz:2992.615
20. Cache size:512 KB
22. Physical id:0
24. Siblings:2
26. Core id:0
28. CPU Cores:1
30. apicid:0
32. Initial apicid:0
34. Fdiv_bug:no
36. Hlt_bug:no
38. F00f_bug:no
40. Coma_bug:no
42. Fpu:yes
44. Fpu_exception:yes
46. CPUID Level:2
48. Wp:yes
50. 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 pebs BTS CID XTPR
52. bogomips:5985.23
54. Clflush size:64
56. cache_alignment:128
58. Address sizes:36 bits physical, bits virtual
60. Power Management:
64. Processor:1
66. Vendor_id:genuineintel
68. CPU Family:15
70. Model:2
72. Model Name:intel (R) Pentium (r) 4 CPU 3.00GHz
74. Stepping:9
76. microcode:0x17
78. CPU mhz:2992.615
80. Cache size:512 KB
82. Physical id:0
84. Siblings:2
86. Core id:0
88. CPU Cores:1
90. Apicid:1
92. Initial apicid:1
94. Fdiv_bug:no
96. Hlt_bug:no
98. F00f_bug:no
100. Coma_bug:no
102. Fpu:yes
104. Fpu_exception:yes
106. CPUID Level:2
108. Wp:yes
110. 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 pebs BTS CID XTPR
112. bogomips:5990.44
114. Clflush size:64
116. cache_alignment:128
118. Address sizes:36 bits physical, bits virtual
120. Power Management:

Enter the command cat/proc/cpuinfo view physical ID There are several, the above results show only 0, so there is only one physical CPU; There are several processor, the above results show 0 and 12, so there are two logical CPUs.

(i) Concept
① Physical CPU
Number of CPUs on the actual server slots
Number of physical CPUs, number of physical IDs that can be repeated
② Logical CPU
/proc/cpuinfo used to store CPU hardware information.
The information content lists the specifications of processor 0–processor N, respectively. It is important to note that N is the number of logical CPUs
In general, we think that a CPU can have multicore, plus Intel's Hyper-Threading Technology (HT), can logically divide the number of CPU core out
Number of logical CPUs = number of physical CPUs x CPU cores This specification value x 2 (if HT is supported and turned on)
Note: Linux top view CPU is also the number of logical CPUs
③CPU Number of cores
The number of chipsets that can process data on a CPU, such as the current i5 760, is a dual-core four-thread CPU, while i5 2250 is a quad-core four-thread CPU
In general, the number of physical CPUs x per core should be equal to the number of logical CPUs, if not equal, it means that the server's CPU support Hyper-Threading Technology
㈡ Viewing CPU information
When we are Cat/proc/cpuinfo,
CPUs with the same core ID are Hyper-threading of the same core
CPUs with the same physical ID are the same CPU-encapsulated thread or core
㈢ The following examples illustrate
① View the number of physical CPUs
#cat/proc/cpuinfo |grep "Physical id" |sort |uniq|wc-l
2
② View the number of logical CPUs
#cat/proc/cpuinfo |grep "Processor" |wc-l
24
③ View CPU is a few cores
#cat/proc/cpuinfo |grep "Cores" |uniq
6
I should be 2 CPUs, each CPU has 6 cores, should be Intel's U, support Hyper-threading, so display 24

See CPU physical and logical numbers under Linux