In what cases is it important to limit the number of active cores when using the Go language?

Limiting the number of active cores (GOMAXPROCS) in Go is important in the following cases:

• Resource usage control: If the application runs on a server with limited resources or in a container with CPU limits, limiting the number of active cores helps prevent excessive CPU consumption.
• Performance optimization: In some cases, too many active cores can lead to excessive contention and context switching, which reduces performance.
• Testing and debugging: To reproduce concurrency-related bugs, it is useful to limit the number of cores to control parallelism.

Example of setting the maximum number of active cores:

import "runtime"

func main() {
    runtime.GOMAXPROCS(2) // Limit to 2 cores
    // rest of the code
}