DOLFIN User Manual - FEniCS Project

DOLFIN User ManualHoffman, Jansson, Logg, Wells}p = i;Alternatively, if the number of steps is unknown, the progress session needsto be updated with the current percentage of the progress:Progress p(‘‘Time-stepping’’);while ( t < T ){...p = t / T;}The progress bar created by the progress session will only be updated if theprogress has changed significantly since the last update (by default at least10%). The amount of change needed for an update can be controlled usingthe parameter ‘‘progress step’’:dolfin_set(‘‘progress step’’, 0.01);Note that several progress sessions may be created simultaneously, or nestedwithin tasks.10.6 Controlling the destination of outputBy default, the DOLFIN log system directs messages to standard output (theterminal). Other options include directing messages to a curses interface orturning of messages completely. To specify the output destination, use thefunction dolfin output() available in the dolfin namespace:void dolfin_output(const char* destination);70