Periodic Output of Grid Variables

The flesh scheduler will automatically call CCTK_OutputGH() at every iteration after the CCTK_ANALYSIS time bin. This function loops over all I/O methods and calls their routines registered as OutputGH() (see also Section B3.3.4).

  int SimpleIO_OutputGH (const cGH *GH);

The OutputGH() routine itself should loop over all variables living on the GH grid hierarchy, and do all necessary output if requested (this is usually determined by I/O parameter settings).

As its return code, it should pass back the number of variables which were output at the current iteration, or zero if no output was done by this I/O method.