go-coremask

A quick way to generate CPU Affinity Mask which can be used to pin processes to specific cpu cores

Affinity Mask?

CPU Affinity is represented as a bitmask, in which each CPU core is representing by a bit in the mask. If the bit value is set to 1, then the process/thread is set to run on that core. By default, the value of all bits is set to 1, meaning all processes can run on any core in the system

How it works?

Currently, two modes are supported:

• generate to generate mask based on user inputs
• detect as a helper to collect info as inputs for generate command

Examples:

// generate coremask for a 44 cores system with hyperthreading on (default)
$ go-coremask generate --cores 44 --selection 2,4,6,8,10,12,14,16
* Total number of CPUs is: 88
* Selected cores for affinity are: "2,4,6,8,10,12,14,16"
* Here's the affinity coremask: 0x1555400000015554

// generate coremask for a system without hyperthreading enabled
$ go-coremask generate -c 8 -s 2,4 --hyperthreading=false
* Total number of CPUs is: 8
* Selected cores for affinity are: "2,4"
* Here's the affinity coremask: 0x14

// detect system CPU info
$ go-coremask detect
= System Information =
Number of Physical CPU Sockets: 2
Number of CPU Cores (Per Socket): 16
** HyperThreading Enabled! Total Number of CPUs is 32
Number of NUMA Nodes: 2