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How Many Logical Processors Used By Current Process in Golang?

  • Last Updated : 10 May, 2020

The task is to find the number of logical CPUs the process can be running on at a given time. Here are the few examples.

Approach 1: Using the NumCPU function

NumCPU  returns the number of logical CPUs usable by the current process.

Syntax: 

func NumCPU() int

Example :



Go




// Golang program to find the 
// number of logical processors
// used by current process
  
package main
  
import (
    "fmt"
    "runtime"
)
  
// Main function
func main() {
      
    // Using the NumCPU function
    fmt.Println(runtime.NumCPU())
}

Output:

8

Approach 2: Using the GOMAXPROCS function

GOMAXPROCS sets the maximum number of CPUs that can be executing simultaneously and returns the previous setting.

Syntax: 

func GOMAXPROCS(n int) int

Example :

Go




// Golang program to find the 
// number of logical processors
// used by current process
  
package main
  
import (
    "fmt"
    "runtime"
)
  
// Main function
func main() {
      
    // Using the GOMAXPROCS function
    fmt.Println(runtime.GOMAXPROCS(0))
}

Output:

8



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