​​2020/03/20 Parallel Model Plan

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​​Stage Fusion

  • ​​check for no dependency (ij)
  • ​​check for same computational extents
​​WIP by ​@Eddie D​ —issue https://github.com/MeteoSwiss-APN/dawn/issues/881
​​Merged into parallel model
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​​Simple lowering

  • ​​each VR -> 1 MS with user specified loop order
  • ​​each Statement -> 1 Stage
​​Done by ​@Tobias W​ — issue https://github.com/MeteoSwiss-APN/dawn/issues/837
​​Merged into parallel model
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​​MultiStage fusion

  • ​​check for compatible loop order
  • ​​check for vertical dependencies, then cannot merge (read in 2nd MS with vertical offset after write in first MS)
  • ​​do not merge if halo too large
​​Done by ​@Eddie D​ — issue https://github.com/MeteoSwiss-APN/dawn/issues/841
​​Merged into parallel model
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​​Make Loop order parallel

  • ​​check for vertical dependencies
  • ​​make parallel if not found
​​Done by ​@Tobias W​ — issue https://github.com/MeteoSwiss-APN/dawn/issues/840
​​Merged into parallel model
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​​Multistage Check for Solver Patterns

  • ​​Done by Tobias
​​Merged into parallel model
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​​MultiStage Check

  • ​​asserts if halo size too large
​​WIP by ​@Eddie D​ —issue  https://github.com/MeteoSwiss-APN/dawn/issues/839
​​(not critical)

​​Stage reordering

  • ​​improve data locality within MS
  • ​​ take statements from the bottom, move them up as far as possible without violating read after write in the same multistage
​​Done by ​@Eddie D​ — issue https://github.com/MeteoSwiss-APN/dawn/issues/879
​​Merged into parallel model
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​​Stage Split

  • ​​no longer needed, needs to be removed
​​WIP by Matthias — issue https://github.com/MeteoSwiss-APN/dawn/issues/838
​​Merged into parallel model
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