How to view CPU configuration information in Linux, and how to view cpu configuration in linux

Source: Internet
Author: User

How to view CPU configuration information in Linux, and how to view cpu configuration in linux

Enter the command: cat/proc/cpuinfo

Check the number of physical IDs in the output result. If 0 is displayed, there is only one physical cpu;

Check the number of processor output results. If there are 0 and 1, there are two logical CPUs.

(1) Concepts

① Physical CPU

Number of CPUs in the actual Server slot

Number of physical CPUs, which can contain a few unique physical IDS

② Logical CPU

/Proc/cpuinfo is used to store cpu hardware information

The information lists the specifications of processor 0-processor n. Note that n is the number of logical CPUs.

In general, we think that a cpu can have multiple cores, and intel's hyper-Threading Technology (HT) can be logically split into multiple cpu cores.

Logical cpu count = physical cpu count x cpu cores specification value x 2 (if ht is supported and enabled)

Note: in Linux, the top view CPU is also the number of logical CPUs.

③ Number of CPU Cores

The number of chipsets that can process data on a CPU. For example, the current i5 760 is a dual-core four-thread CPU, while the i5 2250 is a four-core four-thread CPU.

In general, the number of physical CPUs × the number of each core should be equal to the number of logical CPUs. Otherwise, the CPU of the server supports hyper-Threading Technology.

(2) view CPU Information

When we cat/proc/cpuinfo,

CPU with the same core id is hyper-threading of the same core

A cpu with the same physical id is a thread or core encapsulated by the same CPU.

(3) examples below

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 Check the CPU Cores

# Cat/proc/cpuinfo | grep "cores" | uniq

6

Here I should have 2 CPUs, each of which has 6 cores, which should be Intel's U, supporting hyper-threading, so the display is 24

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