Chapter 0: Setup

Chapter 0: Setup#

The software tools used to execute the examples introduced in this session, as well as the exercises assigned will be are packaged within a CMSSW enviornment in the LPC cluster, and a local compiler. Use whichever one is most convenient for you to use. If, however, you find that neither of these work for you in time for the session, as a last resort, you can also use the C++ Shell website. This options has its limitations in that it cannot make use of user made header files, but it will suffice for most of the material presented.

The LPC Cluster#

Add the following to your local ~/.ssh/config file

Host cmslpc-*.fnal.gov
  StrictHostKeyChecking no
  UserKnownHostsFile /dev/null

and log into the LPC cluster. Once you have logged in, run the following commands

mkdir nobackup/PURSUE-CPP
cd nobackup/PURSUE-CPP
source /cvmfs/cms.cern.ch/cmsset_default.sh
cmsrel CMSSW_15_0_0
cd CMSSW_15_0_0/src/
cmsenv
git clone https://github.com/athete/pursue-cpp-workshop
cd pursue-cpp-workshop

To test that you have the right environment installed, complie and run helloworld.cpp

cd examples_cpp
g++ -o helloworld helloworld.cpp
./helloworld

You should see the following output

Hello, World!

Local#

If you instead choose to run the examples locally, your machine should already have a C++ compiler packaged with the operating system. To make sure that this is the case, run g++ --version. This prints the version of the C++ compiler installed on your computer, if you get any other output complaining about the command not being found, run the following to install it

sudo yum install gcc-c++

Next, clone this repository

git clone https://github.com/athete/pursue-cpp-workshop
cd pursue-cpp-workshop

And test that everything is running as expected by compiling and running helloworld.cpp

cd examples
g++ -o helloworld helloworld.cpp
./helloworld

You should see the following output

Hello, World!
Contents