ninth.c in detail

The maximum number of particles is hardwired to 1000. We distribute particles equally amongst the nodes. The integer division

particle_number = MAX_PARTICLES / pool_size;

• Declaring a simple 4-slot MPI structure
• The all-gather operation
• Orienteering -- the gather operation
• Particle initialisation and exchange of information -- the all-gatherv operation
• Evaluation of forces