Difference between revisions of "Programming/Perl"

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|style="width:5%; border-width: 0" | [[File:icon_pencil.png]]
 
|style="width:5%; border-width: 0" | [[File:icon_pencil.png]]
|style="width:95%; border-width: 0" | When programming with Perl in a HPC environment you will need to change the first line as shown below
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|style="width:95%; border-width: 0" | When programming with Perl in an HPC environment you will need to change the first line as shown below
 
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|-
 
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#!/usr/bin/env perl
 
#!/usr/bin/env perl
 
#
 
#
# VIPER - HPC
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# HPC
# ICTD Department
+
# IT Department
 
# Hull University
 
# Hull University
 
#
 
#
# Written by DBird 25/12/2017
+
# Written by DBird 25/12/2020
  
 
# ---------------- Modules ------------------------------------------
 
# ---------------- Modules ------------------------------------------
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|style="width:5%; border-width: 0" | [[File:icon_exclam3.png]]
 
|style="width:5%; border-width: 0" | [[File:icon_exclam3.png]]
 
|style="width:95%; border-width: 0" | This program does not contain any MPI directives and is shown simply for demonstrative purposes.  
 
|style="width:95%; border-width: 0" | This program does not contain any MPI directives and is shown simply for demonstrative purposes.  
Although PERL does support MPI, it's implementation is quite limited compared to C, C++ and Fortran.
+
Although PERL does support MPI, its implementation is quite limited compared to C, C++, and Fortran.
 
|-
 
|-
 
|}
 
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==== MPI program ====
 
==== MPI program ====
  
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#!/usr/bin/env perl
 
#!/usr/bin/env perl
 
#
 
#
# VIPER - HPC
+
# HPC
# ICTD Department
+
# IT Department
 
# Hull University
 
# Hull University
 
#
 
#
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#SBATCH -p compute
 
#SBATCH -p compute
 
#SBATCH --exclusive
 
#SBATCH --exclusive
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#SBATCH --mail-user= your email address here
  
 
echo $SLURM_JOB_NODELIST
 
echo $SLURM_JOB_NODELIST
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<pre style="background-color: black; color: white; border: 2px solid black; font-family: monospace, sans-serif;">
 
<pre style="background-color: black; color: white; border: 2px solid black; font-family: monospace, sans-serif;">
 
[username@login01 ~]$ sbatch demoPERL.job
 
[username@login01 ~]$ sbatch demoPERL.job
Submitted batch job 289352
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Submitted batch job 4289352
 
</pre>
 
</pre>
  
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* [https://www.tutorialspoint.com/perl/index.htm https://www.tutorialspoint.com/perl/index.htm]
 
* [https://www.tutorialspoint.com/perl/index.htm https://www.tutorialspoint.com/perl/index.htm]
 
* [https://www.perl.org/ https://www.perl.org/]
 
* [https://www.perl.org/ https://www.perl.org/]
{|
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|style="width:5%; border-width: 0" | [[File:icon_home.png]]
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{{Languagespagenav}}
|style="width:95%; border-width: 0" |
 
* [[Main_Page|Home]]
 
* [[Applications|Application support]]
 
* [[General|General]]
 
* [[Training|Training]]
 
* [[Programming|Programming support]]
 
|-
 
|}
 

Latest revision as of 11:18, 23 March 2023

Programming Details

Perl is a family of high-level, general-purpose, interpreted, dynamic programming languages. The languages in this family presently are Perl 5 and Perl 6.

Icon pencil.png When programming with Perl in an HPC environment you will need to change the first line as shown below

 #!/usr/bin/perl

To


 #!/usr/bin/env perl


Programming example

Non MPI program


#!/usr/bin/env perl
#
# HPC
# IT Department
# Hull University
#
# Written by DBird 25/12/2020

# ---------------- Modules ------------------------------------------

use strict;                             # perform error checking

# ---------------- Variables ----------------------------------------

my ($i);

# -------------------------------------------------------------------
# ---------------- Main Program -------------------------------------
# -------------------------------------------------------------------

for($i = 0; $i < 1000; $i++)
{
        print "A-->$i\n";
}

# ---------------- finish up and exit -------------------------------

exit;

Icon exclam3.png This program does not contain any MPI directives and is shown simply for demonstrative purposes.

Although PERL does support MPI, its implementation is quite limited compared to C, C++, and Fortran.

MPI program


#!/usr/bin/env perl
#
# HPC
# IT Department
# Hull University
#
# Written by DBird 25/12/2017

use Parallel::MPI::Simple;

 MPI_Init();
 my $rank = MPI_Comm_rank(MPI_COMM_WORLD);

 if ($rank == 1) 
{
   my $msg = "Hello, I'm $rank";
   MPI_Send($msg, 0, 123, MPI_COMM_WORLD);
 }
 else 
{
   my $msg = MPI_Recv(1, 123, MPI_COMM_WORLD);
   print "$rank received: '$msg'\n";
 }
 MPI_Finalise();
exit;

Running the program

The program could be executed in the following way for test purposes on the login node:


[username@login01 ~]$  module add perl/5.24.0
[username@login01 ~]$  perl testPerl.pl

Batch example


#!/bin/bash

#SBATCH -J openPERL-node
#SBATCH -N 1
#SBATCH --ntasks-per-node 20
#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 perl/5.24.0

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

perl /home/user/PERL/demoPERL.pl


[username@login01 ~]$ sbatch demoPERL.job
Submitted batch job 4289352

Further Information





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