Main.cs

static async Task Main(string[] args)
{
    Console.WriteLine($"pid = {Process.GetCurrentProcess().Id}");
    Console.WriteLine("press ENTER to start...");
    Console.ReadLine();
    await ComputeAsync();

    Console.WriteLine("press ENTER to exit...");
    Console.ReadLine();
}

private static async Task ComputeAsync()
{
    await Task.WhenAll(
        Compute1(),
        ...
        Compute1()
        ); 
}