Programming/C-Sharp

Programming Details

C# is a multi-paradigm programming language encompassing strong typing, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming. Although originally developed by Microsoft for their own platform it has been standardized and a Linux version called MONO has been developed and matured.

The Mono project provides an open-source C# compiler, a complete open-source implementation of the Common Language Infrastructure including the required framework libraries as they appear in the ECMA specification, and a nearly complete implementation of the Microsoft proprietary .NET class libraries up to .NET 3.5. Note at this time Windows Presentation Foundation (WPF) does not exist.

Programming example

using System;
using MPI;

class Ring
{
    static void Main(string[] args)
    {
        using (new MPI.Environment(ref args))
        {
            Intracommunicator comm = Communicator.world;
            if (comm.Rank == 0)
            {
                // program for rank 0
            }
            else // not rank 0
            {
                // program for all other ranks
            }
        }
    }
}

using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Concurrent;

class MatrixCalc
{
        static void Main(string[] args)
        {
                Random rnd = new Random();

                int size = int.Parse(args[0]);
                int maxVal = 255;

                double[,] m1 = new double[size, size];
                double[,] m2 = new double[size, size];
                double[,] res = new double[size, size];

                for (int i = 0; i < size; i++)
                {
                        for (int j = 0; j < size; j++)
                        {
                                m1[i, j] = rnd.Next(0, maxVal);
                                m2[i, j] = rnd.Next(0, maxVal);
                        }
                }
                int para = Environment.ProcessorCount;

                var watch = System.Diagnostics.Stopwatch.StartNew();

                Parallel.For(0, para, worker =>
                {
                        var max = size * (worker + 1) / para;
                        var start = size * worker / para;
                        for (int row = start; row < max; row++)
                        {
                                for (int col = start; col < max; col++)
                                {
                                        double temp = 0;
                                        for (int ele = start; ele < max; ele++)
                                        {
                                                temp += m1[row, ele] * m2[ele, col];
                                        }
                                        res[row, col] = temp;
                                }
                        }
                });

                watch.Stop();
                var elapsedMs = watch.ElapsedMilliseconds;
                System.Console.WriteLine(elapsedMs);
        }
}

Modules Available

The following modules are available:

• module add mono/4.4.1
• module add mono/5.12.0
• module add mono/5.16.0.220

Compilation

The program would be compiled in the following way:

[username@login01 ~]$ module add mono/5.12.0
[username@login01 ~]$ mcs -out:cDEMO.exe cDEMO.cs

Usage Examples

Batch example

#!/bin/bash

#SBATCH -J openmpi-single-node
#SBATCH -N 1
#SBATCH --ntasks-per-node 28
#SBATCH -o %N.%j.%a.out
#SBATCH -e %N.%j.%a.err
#SBATCH -p compute
#SBATCH --exclusive
#SBATCH --mail-user= your email address here

echo $SLURM_JOB_NODELIST

module purge
module add mono/5.12.0

export I_MPI_DEBUG=5
export I_MPI_FABRICS=shm:tmi
export I_MPI_FALLBACK=no

mono /home/user/CODE_SAMPLES/C-SHARP/cDEMO.exe

[username@login01 ~]$ sbatch demo.job
Submitted batch job 1291552

Next Steps

• https://en.wikibooks.org/wiki/C_Sharp_Programming
• OpenMP
• OpenMPI

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