[ET Trac] [Einstein Toolkit] #1664: CarpetIOHDF5 should not try to search for grid scalar s and DSITRIB=CONSTANT arrays in all hdf5 files

[Einstein Toolkit]

#1664: CarpetIOHDF5 should not try to search for grid scalar s and
DSITRIB=CONSTANT arrays in all hdf5 files
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 Reporter:  rhaas         |       Owner:  eschnett           
     Type:  enhancement   |      Status:  new                
 Priority:  minor         |   Milestone:                     
Component:  Carpet        |     Version:  development version
 Keywords:  CarpetIOHDF5  |  
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 Currently, if during a checkpoint recovery a grid scalar or
 DISTRIB=CONSTANT grid array is not found in the first file, then
 CarpetIOHDF5 will eventually open and parse all file looking for this
 dataset. This happens eg when one activates a new thorn with a
 checkpointed scalar or also when a new code version of a thorn that
 declares new checkpointed variables is used.

 Also, the current behaviour is that grid variables that are not found at
 all (as compared to grid variables for which only some but not all
 components are found) are silently ignored.

 Finally, the current checkpointing code will write a copy of grid scalars
 and DISTRIB=CONSTANT grid arrays in every single checkpoint file, which
 means that, for a valid set of checkpoint files, if the grid variable is
 not found in the first file it will also never be found in any of the
 other files.

 The ticket is thus an enhancement request to have CarpetIOHDF5 stop
 searching for the grid variable after the first file. This will not change
 the behaviour of any current checkpoint files but will speed up the case
 where a grid variable is missing. This will either speed up a final error
 report (if eg a thorn was using the missing data and reports poisoned
 data) or the restart with extra thorns significantly.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1664>
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