static void Main(string[] args)
{
using (new MPI.Environment(ref args))
{
Intracommunicator world = MPI.Communicator.world;
// Each process will receive Rank values
int[] counts = new int[world.Size];
int sum = 0;
for (int i = 0; i < world.Size; ++i)
{
counts[i] = i;
sum += i;
}
if (world.Rank == 0)
{
System.Console.Write("Testing reduce-scatter on integers...");
}
int[] intValues = new int[sum];
for (int rank = 0, index = 0; rank < world.Size; ++rank)
{
for (int i = 0; i < rank; ++i, ++index)
{
intValues[index] = i + world.Rank;
}
}
int[] intResults = world.ReduceScatter(intValues, Operation <int> .Add, counts);
Debug.Assert(intResults.Length == world.Rank);
for (int i = 0; i < world.Rank; ++i)
{
Debug.Assert(intResults[i] == world.Size * i + world.Size * (world.Size - 1) / 2);
}
if (world.Rank == 0)
{
System.Console.WriteLine(" done.");
}
if (world.Rank == 0)
{
System.Console.Write("Testing reduce-scatter on strings...");
}
string[] stringValues = new string[sum];
for (int i = 0; i < sum; ++i)
{
stringValues[i] = intValues[i].ToString();
}
string[] stringResults = world.ReduceScatter(stringValues, Operation <string> .Add, counts);
Debug.Assert(stringResults.Length == world.Rank);
for (int i = 0; i < world.Rank; ++i)
{
string expected = "";
for (int p = 0; p < world.Size; ++p)
{
expected += (i + p).ToString();
}
Debug.Assert(stringResults[i] == expected);
}
if (world.Rank == 0)
{
System.Console.WriteLine(" done.");
}
}
}