Output

Output methods in Cactus are all provided by thorns. Any number of output methods can be used for each run. The behaviour of the output thorns in the standard arrangements are described in those thorns' documentation.

In general, output thorns decide what to output by parsing a string parameter containing the names of those grid variables, or groups of variables, for which output is required. The names should be fully qualified with the implementation and group or variable names.

There is usually a parameter for each method to denote how often, in evolution iterations, this output should be performed. There is also usually a parameter to define the directory in which the output should be placed, defaulting to the directory from which the executable is run.

See Chapter D8 for details on creating your own I/O method.