have successfully obtained a certificate
have successfully obtained an account in the glite-tutor.ct.infn.it machine
have successfully registered to the GILDA Virtual Organization
If you are ready, let's start!
login to the glite-tutor.ct.infn.it machine
Having saved your certificate in your disk or pen drive (format pk12), and having successfully managed to login to glite-tutor.ct.infn.it, please copy your pk12 file to a directory .globus in glite-tutor.ct.infn.it under your home dir.

extract your private and public keys (converting pkcs12 to pem):

      openssl pkcs12 -in export.p12 -clcerts -nokeys -out $HOME/.globus/usercert.pem
      openssl pkcs12 -in export.p12 -nocerts -out $HOME/.globus/userkey.pem

The user certificate can safely be world readable, but userkey.pem must only be readable by you!

chmod 0400 $HOME/.globus/userkey.pem

Inspect your certificate using the comand grid-cert-info
Create a proxy with voms extensions using the command voms-proxy-init --voms gilda
Check your voms proxy with the command voms-proxy-info --all
Write your first program to run on a grid.

The type of program we will be running can be called bag-of-tasks or BoT for short.

Your (very simple) program, preferably written in C, should implement a loop with a variable number of iterations. The output of the program will be the number of iterations performed added by some text. The number of iterations should be given to the program in the command line.

Compile your program. Test it in the glite-tutor machine.

Write a JDL description that you can use to submit your program to run in the grid.

Try submitting 10, 100 and 500 jobs to gLite with the same number of iterations and observe the time taken to complete all jobs (makespan).

If you want to have a look at JDL examples, try the GILDA APPLICATIONS

For help with the commands visit the GILDA wiki training material web page and follow the "Basic" exercises or visit the gLite documentation page