[ET Trac] #2576: `after` statements in scheduler in `IllinoisGRMHD`

[Gabriele Bozzola]

#2576: `after` statements in scheduler in `IllinoisGRMHD`

 Reporter: Gabriele Bozzola
   Status: new
Milestone: 
  Version: development version
     Type: bug
 Priority: major
Component: EinsteinToolkit thorn

In fixing #2497, I found that several `after` statements in the `schedule.ccl` of `IllinoisGRMHD` \(but probably also `GiRaFFE`\) are ill-defined \(or I don't know how the scheduler works\). In particular, according to `grep`, the following groups do not exist in the `Einstein Toolkit`:

* `BSSN_RegisterVars`
* `lapse_RegisterVars` 
* `Lapse_InitSymBound`
* `empostid`
* `lapsepostid`
* `p2c`
* `bssn_rhs`
* `shift_rhs`
* `compute_B_postrestrict`
* `mhd_conserv2prims_postrestrict`
* `outer_boundaries_on_A_mu` \(probably this one should be `IllinoisGRMHD_outer_boundaries_on_A_mu`\)
* `compute_B_and_Bstagger_from_A` \(probably this one should be `IllinoisGRMHD_compute_B_and_Bstagger_from_A`\)

In addition to this:

* `IllinoisGRMHD_compute_B_and_Bstagger_from_A` is scheduled in `HydroBase_Boundaries`, but then `IllinoisGRMHD_conserv_to_prims` to be after `compute_B_and_Bstagger_from_A`, but it is scheduled in another group \(originally `AddToTmunu`, but with my fix it is `SetTmunu`\), so I am not sure what’s the use of that `after`
* `IllinoisGRMHD` does not define `READ/WRITE` statements

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2576/after-statements-in-scheduler-in
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