How Many Processors is My Go Program Actually Using?

Golang: Determining the Number of Processors Utilized by a Go Program

In Golang, the runtime.GOMAXPROCS function allows you to set the maximum number of logical CPUs that a Go program can utilize. However, understanding precisely how many processors are currently in use can be a challenge.

Verifying Processor Usage

To verify the number of processors on which a Go program is running, you can use the following steps:

1. Print the NumCPU: The runtime.NumCPU() function returns the total number of logical CPUs available to the system. This will be the maximum number of processors that a Go program can potentially use.
2. Calculate Max Parallelism: The MaxParallelism function determines the largest number of logical CPUs that a process can be running on at any given time. This function takes into account both runtime.GOMAXPROCS(0) and runtime.NumCPU().

By comparing the value of runtime.NumCPU() to the value returned by MaxParallelism, you can determine the actual number of processors being utilized by your Go program.

Example Code:

The following example code demonstrates how to verify the number of processors being utilized:

package main

import "fmt"
import "runtime"

func main() {
  numCPU := runtime.NumCPU()
  maxParallelism := runtime.MaxParallelism()
  fmt.Println("Total Logical CPUs:", numCPU)
  fmt.Println("Maximum Parallelism:", maxParallelism)
}

Output:

The output of the above code will vary depending on the system it is run on, but will provide insights into the number of processors being utilized by the Go program.

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