What is the difference in the ability to run a large number of lightweight threads in Go compared to other programming languages?

Go uses its own concurrency model based on goroutines — lightweight threads managed by the Go runtime rather than the operating system. Unlike traditional threads, which are created and managed by the OS and have significant memory and context-switching overhead, goroutines occupy only a few kilobytes of memory and can be launched in vast numbers (tens or hundreds of thousands) without substantial performance degradation.

The Go runtime independently schedules goroutines across system threads, efficiently utilizing multiprocessing. This allows writing high-performance concurrent code with minimal resource costs and without complex thread management.

Example of creating multiple goroutines:

for i := 0; i < 100000; i++ {
    go func(n int) {
        // Some work
        fmt.Println(n)
    }(i)
}
// Waiting for completion (e.g., via sync.WaitGroup)

Thus, the key difference is the lightweight nature and efficient scheduling of goroutines, enabling them to be launched much more than traditional threads in other languages.