通過lscpu命令，可以看到CPU的一些基本信息。如下所示，可以很清楚的看到這臺服務器使用兩個物理socket，每個socket上有6個core，每個core上有兩個線程(超線程)，所以一共有2 * 6 * 2 = 24個邏輯CPU。

Architecture: x86_64

CPU op-mode(s): 32-bit, 64-bit

Byte Order: Little Endian

CPU(s): 24

On-line CPU(s) list: 0-23

Thread(s) per core: 2

Core(s) per socket: 6

CPU socket(s): 2

NUMA node(s): 2

Vendor ID: GenuineIntel

CPU family: 6

Model: 62

Stepping: 4

CPU MHz: 2601.000

BogoMIPS: 5187.39

Virtualization: VT-x

L1d cache: 32K

L1i cache: 32K

L2 cache: 256K

L3 cache: 15360K

NUMA node0 CPU(s): 0-5,12-17

NUMA node1 CPU(s): 6-11,18-23

通過cat /proc/cpuinfo同樣可以看到一些信息，這里會給socket、core和線程設置id。

同一個socket的physical id相同

cpu cores表示此socket上的core數量

如果cpu cores = siblings，表明沒有開啟超線程

如果cpu cores = 2 * siblings，表明開啟了超線程

相同的physical id，相同的core id，但是不同的processor id，表明是同一個core上的邏輯CPU(超線程)

cpuinfo示例如下所示(原文引用已經找不到了，直接貼在這里)

Example 1: Single processor, 1 core, no Hyperthreading

Processor : 0

model name : AMD Duron(tm) processor

cache size : 64 KB

Example 2: Single processor, 1 core, Hyperthreading is enabled.

Notice how we have 2 siblings, but only 1 core. The physical CPU id is the same for both: 0.

processor : 0

model name : Intel(R) Pentium(R) 4 CPU 2.80GHz

cache size : 1024 KB

physical id : 0 # same physical id

siblings : 2

core id : 0 # same core id

cpu cores : 1

processor : 1

model name : Intel(R) Pentium(R) 4 CPU 2.80GHz

cache size : 1024 KB

physical id : 0 # same physical id

siblings : 2

core id : 0 # same core id

cpu cores : 1

Example 3. Single socket Quad Core

Notice how each processor has its own core id. The number of siblings matches the number of cores so there are no Hyperthreading siblings. Also notice the huge L2 cache - 6 MB. That makes sense though, when considering 4 cores share that L2 cache.

processor : 0

model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz

cache size : 6144 KB

physical id : 0 # same physical id

siblings : 4

core id : 0 # different core id

cpu cores : 4

processor : 1

model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz

cache size : 6144 KB

physical id : 0 # same physical id

siblings : 4

core id : 1 # different core id

cpu cores : 4

processor : 2

model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz

cache size : 6144 KB

physical id : 0 # same physical id

siblings : 4

core id : 2 # different core id

cpu cores : 4

processor : 3

model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz

cache size : 6144 KB

physical id : 0 # same physical id

siblings : 4

core id : 3 # different core id

cpu cores : 4

Example 3a. Single socket Dual Core

Again, each processor has its own core so this is a dual core system.

processor : 0

model name : Intel(R) Pentium(R) D CPU 3.00GHz

cache size : 2048 KB

physical id : 0 # same physical id

siblings : 2

core id : 0 # different core id

cpu cores : 2

processor : 1

model name : Intel(R) Pentium(R) D CPU 3.00GHz

cache size : 2048 KB

physical id : 0 # same physical id

siblings : 2

core id : 1 # different core id

cpu cores : 2

Example 4. Dual Single core CPU, Hyperthreading ENABLED

This example shows that processer 0 and 2 share the same physical CPU and 1 and 3 share the same physical CPU. The number of siblings is twice the number of cores, which is another clue that this is a system with hyperthreading enabled.

processor : 0

model name : Intel(R) Xeon(TM) CPU 3.60GHz

cache size : 1024 KB

physical id : 0 # different physical id

siblings : 2

core id : 0 # same core id

cpu cores : 1

processor : 1

model name : Intel(R) Xeon(TM) CPU 3.60GHz

cache size : 1024 KB

physical id : 3 # different physical id

siblings : 2

core id : 0 # same core id

cpu cores : 1

processor : 2

model name : Intel(R) Xeon(TM) CPU 3.60GHz

cache size : 1024 KB

physical id : 0 # different physical id

siblings : 2

core id : 0 # same core id

cpu cores : 1

processor : 3

model name : Intel(R) Xeon(TM) CPU 3.60GHz

cache size : 1024 KB

physical id : 3 # different physical id

siblings : 2

core id : 0 # same core id

cpu cores : 1

Example 5. Dual CPU Dual Core No hyperthreading

Of the 5 examples this should be the most capable system processor-wise. There are a total of 4 cores : 2 cores in 2 separate socketed physical CPUs. Each core shares the 4MB cache with its sibling core. The higher clock rate (3.0 GHz vs 2.3GHz) should offer slightly better

performance than example 3.

processor : 0

model name : Intel(R) Xeon(R) CPU 5160 @ 3.00GHz

cache size : 4096 KB

physical id : 0 # different physical id

siblings : 2

core id : 0 # different core id

cpu cores : 2

processor : 1

model name : Intel(R) Xeon(R) CPU 5160 @ 3.00GHz

cache size : 4096 KB

physical id : 0 # different physical id

siblings : 2

core id : 1 # different core id

cpu cores : 2

processor : 2

model name : Intel(R) Xeon(R) CPU 5160 @ 3.00GHz

cache size : 4096 KB

physical id : 3 # different physical id

siblings : 2

core id : 0 # different core id

cpu cores : 2

processor : 3

model name : Intel(R) Xeon(R) CPU 5160 @ 3.00GHz

cache size : 4096 KB

physical id : 3 # different physical id

siblings : 2

core id : 1 # different core id

cpu cores : 2

總結

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