static void Main(string[] args)
{
using (new MPI.Environment(ref args))
{
Intracommunicator comm = Communicator.world;
string[] data = new string[comm.Size];
for (int i = 0; i < comm.Size; i++)
{
data[i] = "This string came from Rank " + comm.Rank;
}
string[] results = comm.Alltoall(data);
if (comm.Rank == 0)
{
Console.WriteLine("The root's array contains: ");
foreach (string x in results)
{
Console.WriteLine(x);
}
}
}
}
public static void DoTest(string[] args)
{
using (new MPI.Environment(ref args))
{
Intracommunicator world = Communicator.world;
if (world.Rank == 0)
{
System.Console.Write("Testing all-to-all on integers...");
}
int[] sendInts = new int[world.Size];
for (int dest = 0; dest < world.Size; ++dest)
{
sendInts[dest] = world.Size * world.Rank + dest;
}
int[] recvInts = world.Alltoall(sendInts);
for (int source = 0; source < world.Size; ++source)
{
MPIDebug.Assert(recvInts[source] == world.Size * source + world.Rank);
}
if (world.Rank == 0)
{
System.Console.WriteLine(" done.");
}
if (world.Rank == 0)
{
System.Console.Write("Testing all-to-all on strings...");
}
string[] sendStrings = new string[world.Size];
for (int dest = 0; dest < world.Size; ++dest)
{
sendStrings[dest] = sendInts[dest].ToString();
}
string[] recvStrings = world.Alltoall(sendStrings);
for (int source = 0; source < world.Size; ++source)
{
MPIDebug.Assert(recvStrings[source] == recvInts[source].ToString());
}
if (world.Rank == 0)
{
System.Console.WriteLine(" done.");
}
if (world.Rank == 0)
{
System.Console.Write("Testing AlltoallFlattened with integers...");
}
int size = Communicator.world.Size;
int rank = Communicator.world.Rank;
int[] outData = new int[(size * size - size) / 2];
int[] inData = new int[rank * size];
int[] sendCounts = new int[size];
int[] recvCounts = new int[size];
for (int i = 0; i < rank * size; i++)
{
inData[i] = rank;
}
for (int i = 0; i < size; i++)
{
sendCounts[i] = rank;
}
for (int i = 0; i < size; i++)
{
recvCounts[i] = i;
}
Communicator.world.AlltoallFlattened(inData, sendCounts, recvCounts, ref outData);
int p = 0;
for (int i = 0; i < size; ++i)
{
if (recvCounts[i] > 0)
{
for (int j = 0; j < i; j++)
{
MPIDebug.Assert(outData[p] == i);
}
}
p += recvCounts[i];
}
if (world.Rank == 0)
{
System.Console.WriteLine(" done.");
}
if (world.Rank == 0)
{
System.Console.Write("Testing AlltoallFlattened with strings...");
}
string[] outData_s = new string[(size * size - size) / 2];
string[] inData_s = new string[rank * size];
for (int i = 0; i < rank * size; i++)
{
inData_s[i] = rank.ToString();
}
Communicator.world.AlltoallFlattened(inData_s, sendCounts, recvCounts, ref outData_s);
p = 0;
for (int i = 0; i < size; ++i)
{
if (recvCounts[i] > 0)
{
for (int j = 0; j < i; j++)
{
MPIDebug.Assert(outData_s[p] == i.ToString());
}
}
p += recvCounts[i];
}
if (world.Rank == 0)
{
System.Console.WriteLine(" done.");
}
}
}
