Calculate AuxKernels and Postprocessors only every N-th timestep and/or at specified times

[WilkAndy]

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Question

How do i calculate AuxKernels and Postprocessors only every N-th timestep and/or at specified times?

The reason I want to do this is in explicit time-stepping calculations, calculations of Aux and PP can take about 1/2 the walltime, but in reality i only need them at every ~1000th timestep. I'm interested in PPs like max|residual| and max|variable_dot|, where "max" is over all DOFs.

[lindsayad]

@WilkAndy I don't believe we can do this. For a future implementation of this capability I think leveraging the Times system that @GiudGiud created might be the way to go