Does SplitRungeKutta3 support checkpointing?

[glwagner]

It would seem not since all we have is:

Oceananigans.jl/src/OutputWriters/checkpointer.jl

Lines 261 to 265 in 0b6e88e

	set_time_stepper!(timestepper::RungeKutta3TimeStepper, file, model_fields) =
	set_time_stepper_tendencies!(timestepper, file, model_fields)
	set_time_stepper!(timestepper::QuasiAdamsBashforth2TimeStepper, file, model_fields) =
	set_time_stepper_tendencies!(timestepper, file, model_fields)

The mystery of how @simone-silvestri does checkpointing thus endures.

[glwagner]

Hmm actually I take that back, I guess RK3 shouldn't require checkpointing. So the real issue is that we save the tendencies for RungeKutta3!

[ali-ramadhan]

Ah so it seems that checkpointing does work for RK3 but it's just a bit inefficient as it saves tendencies to disk when it doesn't need to? Curious if this is also true for hydrostatic.

[glwagner]

ummmmm well with hydrostatic RK3 its called SplitRungeKutta3TimeStepper which doesn't appear to have bespoke methods in checkpointer.jl so not sure what's happening there