[ET Trac] [Einstein Toolkit] #1700: Use 64-bit integers when building PETSc

[Einstein Toolkit]

#1700: Use 64-bit integers when building PETSc
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 Reporter:  eschnett               |       Owner:                     
     Type:  enhancement            |      Status:  new                
 Priority:  major                  |   Milestone:                     
Component:  EinsteinToolkit thorn  |     Version:  development version
 Keywords:                         |  
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 PETSc needs to be able to count up to the total (global) number of points
 it uses, not just process-local points. 32-bit integers are not sufficient
 for large runs. Note that e.g. Carpet already uses 64-bits integers for
 the same reason.

 I suggest to enable the respective option when building PETSc by default.
 TATPETSc supports this, other thorns may need to be updated.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1700>
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