Programming/C-Sharp

2023-08-31T13:49:31Z

NikolaiV: /* Programming example */

== 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 ===

<pre style="background-color: #C8C8C8; color: black; border: 2px solid #C8C8C8; font-family: monospace, sans-serif;">
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
}
}
}
}
</pre>
<pre style="background-color: #C8C8C8; color: black; border: 2px solid #C8C8C8; font-family: monospace, sans-serif;">
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);
}
}

</pre>

==== 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:

<pre style="background-color: black; color: white; border: 2px solid black; font-family: monospace, sans-serif;">
[username@login01 ~]$ module add mono/5.12.0
[username@login01 ~]$ mcs -out:cDEMO.exe cDEMO.cs
</pre>

== Usage Examples ==

=== Batch example ===

<pre style="background-color: #f5f5dc; color: black; font-family: monospace, sans-serif;">
#!/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
</pre>

<pre style="background-color: black; color: white; border: 2px solid black; font-family: monospace, sans-serif;">
[username@login01 ~]$ sbatch demo.job
Submitted batch job 1291552
</pre>

== Next Steps ==

* [https://en.wikibooks.org/wiki/C_Sharp_Programming https://en.wikibooks.org/wiki/C_Sharp_Programming]
* [[programming/OpenMP|OpenMP]]
* [[programming/OpenMPI|OpenMPI]]

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Programming/C-Sharp