Linux找出超线程核心ID [英] Linux find out Hyper-threaded core id

问题描述

今天上午我花了很多时间来找出如何确定哪个处理器ID是超线程内核，但是没有运气.

I spent this morning trying to find out how to determine which processor id is the hyper-threaded core, but without luck.

我希望找出这些信息，并使用set_affinity()将进程绑定到超线程线程或非超线程线程，以描述其性能.

I wish to find out this information and use set_affinity() to bind a process to hyper-threaded thread or non-hyper-threaded thread to profile its performance.

推荐答案

我发现了做我需要的简单技巧.

I discovered the simply trick to do what I need.

cat /sys/devices/system/cpu/cpu0/topology/thread_siblings_list

如果第一个数字等于CPU编号(在此示例中为0)，则它是一个真正的内核，否则，它是一个超线程内核.

If the first number is equal to the CPU number (0 in this example) then it's a real core, if not it is a hyperthreading core.

真实的核心示例:

# cat /sys/devices/system/cpu/cpu1/topology/thread_siblings_list
1,13

超线程核心示例

# cat /sys/devices/system/cpu/cpu13/topology/thread_siblings_list
1,13

第二个示例的输出与第一个示例完全相同.但是，我们正在检查cpu13，第一个数字是1，因此CPU 13是超线程内核.

The output of the second example is exactly the same as the first one. However we are checking cpu13, and the first number is 1, so CPU 13 this is an hyperthreading core.

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