了解CPU信息 [英] Making sense of cpu info

问题描述

我通常知道，处理器数量越多，进程就越多（可以同时观看电影，玩游戏，在youtube上播放Firefox和播放辛普森的剧集），而计算机却不会变慢。但是我想知道如何理解linux命令cpuinfo和lscpu。

I generally know that the more the number of processors the more processes (watching a movie, playing some game, running firefox with youtube playing a Simpson's episode, all simultaneously) you can have simultaneously going without your computer slowing down. But I want to know how to make sense of the linux commands cpuinfo and lscpu.

lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 42
Stepping:              7
CPU MHz:               1600.000
BogoMIPS:              6800.18
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node0 CPU(s):     0-7

和cpuinfo：

=====  Processor composition  =====
Processor name    : Quad-Core AMD Opteron(tm) Processor 2354  
Packages(sockets) : 2
Cores             : 8
Processors(CPUs)  : 8
Cores per package : 4
Threads per core  : 1

=====  Processor identification  =====
Processor   Thread Id.  Core Id.    Package Id.
0           0           0           0   
1           0           1           0   
2           0           2           0   
3           0           3           0   
4           0           0           1   
5           0           1           1   
6           0           2           1   
7           0           3           1   
=====  Placement on packages  =====
Package Id. Core Id.    Processors
0           0,1,2,3     0,1,2,3
1           0,1,2,3     4,5,6,7

他们到底在告诉我什么。对我来说，双核意味着每个处理器两个核。我可以看到列出了8个CPU。但是线程和核心之间有什么区别。我可以看到每个内核有2个线程。什么是插座？我无法在Google那里解释问题的地方，但是有很多地方告诉您使用cpuinfo / lscpu。

What exactly are they telling me. A dual core to me means two core per processor. I can see 8 CPU(s) listed. But what is the difference between thread and cores. I can see 2 Thread(s) per core. And what is a socket? I could not google a place where things are explained but there are plenty of places which tell you to use cpuinfo/lscpu.

推荐答案

从技术上讲，您所谓的核心是物理核心，也就是套接字，也就是封装。

What you call "core" is technically a "physical core", aka socket aka package.

物理核心被虚拟地拆分为逻辑核心（由cpuinfo / lscpu简单列为核心。）

A physical core is "virtually splitted" into logical cores (listed simply as "core(s)" by cpuinfo/lscpu.

因此，您的系统有2个物理核心，每个物理核心又分为4个逻辑核心。

So your system has 2 physical cores, each one divided into 4 logical cores. This sums up into 8 logical cores.

tomshw上的类似问题：
< a href = http://www.tomshardware.co.uk/answers/id-1850932/difference-physical-core-logical-core.html rel = nofollow> http://www.tomshardware.co。 uk / answers / id-1850932 / difference-physical-core-logical-core.html

A similar question on tomshw: http://www.tomshardware.co.uk/answers/id-1850932/difference-physical-core-logical-core.html

超线程：
http://en.m.wikipedia.org/wiki/Hyper-threading

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