EXAMPLES AND EXERCISES FOR THE PACS COURSE

This repo contains source code and descriptions for the examples and exercises that will be explained during the APSC (Advanced Programming for Scientific Computing) course at Politecnico di Milano, also known as PACS (Programmazione Avanzata per il Calcolo Scientifico)

The repository contains submodules, so to check it out properly you have to type

git clone --recursive https://github.com/pacs-course/pacs-examples.git

or (preferred choice!)

git clone --recursive git@github.com:pacs-course/pacs-examples.git

In the latter case, you must register your ssh keys on a GitHub account.

To keep your local repo updated with changes upstream do frequently

git pull --recurse-submodules

or just, from this directory,

./update.sh

The software requires a c++ compiler, i.e. gcc >= 8.0 or clang >= 8, and the Eigen library for linear algebra version 8.

You may check the version of your compiler with the option -v. Several examples have now been ported to c++17 and some examples even to c++20. Please, check whether your compiler supports those standards. You may have a look at https://en.cppreference.com/w/cpp/compiler_support

Module (mk) system

In the course, we use the mk module system provided in this repository (nothing to do with girt submodules!). However, this is not strictly required, you can do without, if you have a recent Linux distribution.

If you use the modules this directory contains some utilities:

** load_modules

You load the most relevant modules with:

source load_modules

or

. load_modules.sh

will load the main modules used in the examples, apart from hdf5, which is used only in the example on input-output streams.

Installing git submodules

If you do not have used --recursive when cloning this repo and you want to use the git submodules containing third-party software type:

./install_git_submodules.sh

The file submodule_commands.txt contains some reminders of useful git commands for operating with submodules. We also have the following utilities

• change_submodules_url.sh changes the protocol of the submodules to https. You should not need it!

• change_submodules_url_ssh.sh changes the protocol of the submodules to ssh. You should not need it!

WHAT DO DO NEXT?

• Go to the Extras/ directory, which contains additional software used by some examples and follow the instructions in the local README.md file.
• Go to the Examples/ directory and follow the instructions in the local README.md file.

WHY MAKEFILES?

I have used standard makefiles since I find that they allow simpler handling of "disaggregated software", where you have several partially independent examples which share, however, some common features. Indeed porting to cmake is possible, but so far it is not planned.

DISCLAIMER

The code in this repository is just a collection of examples. Some of them are rather complete and may form the basis of derivative work. You are free to use them at your wish (give credits please), but remember that I do not make any claim on their suitability for your work, nor that they are free of bugs.