add simple CPU load generator

[ondrejsika]

https://chat.openai.com/share/06fc3092-26ec-4f04-9680-93e0f8fda3b1

package main

import (
	"fmt"
	"os"
	"runtime"
	"strconv"
	"sync"
)

// generateLoad generates CPU load by performing mathematically intensive operations.
func generateLoad(wg *sync.WaitGroup) {
	defer wg.Done()
	for {
		_ = 123456789 * 987654321
	}
}

func main() {
	if len(os.Args) != 2 {
		fmt.Println("Usage: go run main.go <num_goroutines>")
		return
	}

	// Determine the number of goroutines to launch based on user input.
	numGoroutines, err := strconv.Atoi(os.Args[1])
	if err != nil {
		fmt.Printf("Error: %v\n", err)
		return
	}

	// Use all available CPUs.
	runtime.GOMAXPROCS(runtime.NumCPU())

	var wg sync.WaitGroup

	// Create and start the specified number of goroutines.
	for i := 0; i < numGoroutines; i++ {
		wg.Add(1)
		go generateLoad(&wg)
	}

	fmt.Printf("Generating CPU load with %d goroutines...\n", numGoroutines)
	wg.Wait() // This line will actually never be reached as the load generation is infinite.
}