# Nbody

## Description

Nbody simulation is a simulation of a dynamical system of particles, usually under the influence of physical forces, such as gravity.

## Versions

We have several implementations of this benchmark:

* **01.multisaxpy_cuda:** Parallel version using CUDA tasks

* **02.multisaxpy_hybrid:** parallel version using a combination of CUDA and SMP tasks in alternating iterations

## Execution instructions

Before executing the program, it is necessary to configure Nanos6 to use the GPU-enabled hierarchical scheduler, thus it is necessary to set the environment variable *NANOS6_SCHEDULER* to *hierarchical*

To run the program use:
```
NANOS6_SCHEDULER=hierarchical ./nbody [input-file]
```

Input files can be found in the *data/input* folder. 
The programs creates a *nbody_out.xyz* file which can be compared with the reference file in the *data/output* folder to check for correctness.