[ET Trac] [Einstein Toolkit] #487: SimFactory should allow steering of parameters between restarts

[Einstein Toolkit]

#487: SimFactory should allow steering of parameters between restarts
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  Reporter:  hinder       |       Owner:  eschnett
      Type:  enhancement  |      Status:  new     
  Priority:  major        |   Milestone:          
 Component:  SimFactory   |     Version:          
Resolution:               |    Keywords:          
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Comment (by hinder):

 I agree - I like this abstraction and it would be good to keep it.  Maybe
 a good interface would be a new option "--continue" to the create command:

   sim create --continue [--parfile <parfile>] [--config <config>]
 <simname>

 The high-level view would be that there is an existing simulation which
 needs to be "continued" in a new simulation.  The implementation would be
 that the checkpoint files of the old simulation are hard-linked into the
 new simulation.  At the same time, a new parameter file can be provided to
 do parameter steering.

 One issue with this is that users will want to treat the resulting
 "combination" of simulations as a single physics run.  Does this mean that
 analysis tools must now handle not only the case of data chunked into
 restarts, but also of collections of simulations corresponding to
 different parameter choices?  When steering can be done within a
 simulation, this extra level of complication in analysis tools is not
 needed.

 If the new simulation contains a pointer to the simulation it was
 continued from, analysis tools can be given the last simulation in the
 sequence and work their way back to get the entire physics run.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/487#comment:2>
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