CIME Development Plans

Plans made April-Aug 2017. Progress noted on July 6, 2022.

Near term

Fix bugs and harden for release and improve CIME performance in E3SM and CESM.

Support for configuring system with different couplers (CSEG and E3SM) - DONE
An alternate coupling layer and driver using NUOPC/EMSF (CSEG) (this includes run-time maps and 2nd order conservative maps) - DONE
An alternative coupling layer and driver supporting exascale (E3SM) (MOAB) - not DONE
Support for pause/resume/rewind capability and the addition of a new component that will perform ensemble kalman filter file-based data assimilation. Rewind capability will also be leveraged to incorporate new fault tolerant capabilities (CSEG) - CIME parts DONE
Removal of hard-coding of fields exchanged by components and incorporation of new xml-based namelist generation mechanism to generate the required fields exchanged from the compset specification (CSEG and E3SM) DONE in NUPOC coupler.

Improve performance of CIME: DONE mostly by moving data model buildnmls to python.
Faster configure, test and build systems in a more modern language (E3SM and CSEG): Cmake-based build now supported.
Separation of configure and build systems (E3SM and CSEG): Not Done.
New post-processing diagnostic capability that will accompany an experimental case (CSEG)

(who is planning to work on it)

Faster and more scalable data models ( E3SM and CSEG) (some done for DATM via reading in multiple time samples at once): No longer a CIME issue.
More extensive share namelist generation across data models (CSEG) (DONE)
Addition of 3d spatial and time-interpolation capabilities (CSEG) (partly done by tcraig)
Addition of a data land-ice component (CSEG) (not high priority)

_Extension of code and machine coverage in tests (E3SM and CSEG): Better and continuing
Defining and adding more test types in CIME (E3SM and CSEG). Not much done.
Fewer invocations of build when testing (E3SM). Some capability added.
Better support for C++ compilation (E3SM and CSEG). DONE

PIO2: Support only PIO2 across the system based on improving performance of PIO2 (currently both PIO1 and PIO2 are supported) (E3SM and CSEG), (DONE and no longer a CIME issue)
Update and test load balancing tool (E3SM) (DONE)
E3SM is also doing work in standalone remapping and statistical testing tools but they are not part of or based on CIME’s tools.