Should all available processor cores be allocated for a single task?

It is not always advisable to allocate all available CPU cores for a single task. In Go, the default number of cores used is equal to the number of logical processors, but sometimes this can lead to excessive competition for resources, especially if other processes are running on the system.

If the task is single-threaded or heavily blocked (for example, on input/output), allocating all cores will not improve performance. Additionally, excessive use of all cores can lead to overhead from context switching.

In Go, to manage the number of cores used, there is the function runtime.GOMAXPROCS(n), where n is the number of cores you want to use. The optimal value depends on the specific task and system load.

Example of setting the number of cores:

import (
    "runtime"
)

func main() {
    runtime.GOMAXPROCS(4) // use 4 cores
    // ...
}