Observe the size of the time steps.

Writes reduction quantities:

• Time
• Number of degrees of freedom
• Slab size
• Minimum time step
• Maximum time step
• Effective time step

The effective time step is the step size of a global-time-stepping method that would perform a similar amount of work. This is the harmonic mean of the step size over all degrees of freedom:

\begin{equation}(\Delta t)_{\text{eff}}^{-1} = \frac{\sum_{i \in \text{dof}} (\Delta t)_i^{-1}}{N_{\text{dof}}}. \end{equation}

This corresponds to averaging the number of steps per unit time taken by all points.

All values are reported as positive numbers, even for backwards evolutions.