====== Global variables ======

Auryn classes use the following global variables (as of Auryn v0.8.0) which are initialized by the [[AurynInit|auryn_init()]] function.

In ''auryn_global.h'' 
<code c++>
extern System * sys;
extern Logger * logger;
</code>
Are references to the Auryn kernel (sys) and the global logger.

<code c++>
extern mpi::environment * mpienv;
extern mpi::communicator * mpicommunicator;
</code>
References required by [[Boost|Boost MPI]]. These variables are not declared when Auryn is compiled without MPI support.


In ''auryn_definitions.h'':
<code c++>
extern double auryn_timestep; 
</code>
Defines the Auryn simulation time step in seconds has to be set/changed before [[AurynInit|auryn_init()]] is called. The default time step is 1e-4 (0.1ms). ''auryn_timestep'' was formally called ''dt'' in older versions.