`resplit` with Custom MPI Datatypes and AlltoAllW

[JuanPedroGHM]

Due Diligence

• General:
  • [ ] title of the PR is suitable to appear in the Release Notes
• Implementation:
  • [ ] unit tests: all split configurations tested
  • [ ] unit tests: multiple dtypes tested
  • [ ] documentation updated where needed

Description

Attempt at rewriting the reshape/resplit function using custom MPI datatypes.

Issue/s resolved: #

Changes proposed:

Type of change

Memory requirements

Performance

Does this change modify the behaviour of other functions? If so, which?

yes / no