[ET Trac] [Einstein Toolkit] #1441: Mode timer tree no longer supports multipatch

[Einstein Toolkit]

#1441: Mode timer tree no longer supports multipatch
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 Reporter:  hinder  |       Owner:  eschnett           
     Type:  defect  |      Status:  new                
 Priority:  minor   |   Milestone:                     
Component:  Carpet  |     Version:  development version
 Keywords:          |  
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 The parameter setting

 Carpet::include_maps_in_mode_timer_tree = yes

 does not work with the new timer tree code which includes a reduction
 across processes.  This code expects all timers to exist on all processes,
 but with multipatch, and the above setting, local mode is not entered for
 all refinement levels on all processes (because not all processes have all
 maps), and the timer code aborts with the error "Timers are inconsistent
 across processes: root process expects timer [done], this process has
 timer enter_local_mode instead".

 One solution would be for the timers to be created and not started on the
 other processes.  Another would be to modify the reduction code to allow
 missing timers on some processes.

 As a general goal, we are trying to move away from global knowledge and
 synchronisation across all processes. Such a goal favours making the
 reduction code more tolerant to each process having a different state.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1441>
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