Cancel an execution "properly"

[Hyzbade]

If a current execution is computing, we don't necessary want to force it to shut down immediately. By the way, in the case of an evolutionary algorithm, that would be interesting to decrease the number of generations when it is computing.

[samthiriot]

What would be the idea: one can cancel the execution of one individual without cancelling the overvall computation of the generation ?

In this case, it might be coded in the EvaluateOneGenerationExec (or some similar name): when a sub child is switched to state "cancel", then don't cancel the parent one; also in this case we have to deal with the absence of result, but this might be done as for constrained individuals.

[Hyzbade]

I think the main insight twofold here:

• when we want to stop an execution whereas we expect a CSV output (for example) at the end of each iteration, before canceling, write in the CSV file (same thing with a display)
• for an EA, if I change the number of iteration while the optimization is processing, I want to take into account this update (if the algorithm have to stop, before it shuts down, it should check his parameters)