Linux上如下指令可以查看CPU的信息
> lscpu
在我们线上机器上的结果如下:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 32
On-line CPU(s) list: 0-31
Thread(s) per core: 2
Core(s) per socket: 8
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 62
Model name: Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz
Stepping: 4
CPU MHz: 1320.468
CPU max MHz: 2500.0000
CPU min MHz: 1200.0000
BogoMIPS: 4000.99
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 20480K
NUMA node0 CPU(s): 0-7,16-23
NUMA node1 CPU(s): 8-15,24-31
上面的信息,有几个比较有意思:
Thread(s) per core: 2
Core(s) per socket: 8
Socket(s): 2
什么是Socket
Socket就是主板上插CPU的槽的数量
什么是Core
Core就是平时说的核,双核、四核等,就是每个CPU上的核数
什么是Thread
thread就是每个core上的硬件线程数,即超线程
对操作系统来说,其逻辑CPU的数量就是Socket*Core*Thread
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