C# - 100 characters

Here is an answer in C# (although AsParallel only spawns accordingly to the number of cores in ones CPU).

void ss(int[]xs){xs.AsParallel().Select(x=>{Thread.Sleep(x);return x;}).ForAll(Console.WriteLine);}

C# - 137 characters

Here is an answer in C# (updated with degrees of parallelism as commented)

void ss(int[]xs){xs.AsParallel().WithDegreeOfParallelism(xs.Length).Select(x=>{Thread.Sleep(x);return x;}).ForAll(Console.WriteLine);}