Regression Test Policy for Weather Model Platforms and Compilers

The compiler and platform support policy for the UFS weather model follows the general principles outlined in the Regression Test Policy for Platforms and Compilers and the specific principles outlined in the Regression Test Policy for Medium-Range Weather App Platforms and Compilers. The details for the UFS weather model are outlined below.

Tier-1 platforms

Tier 1 platforms and compilers have been identified and the policy is partially implemented. Portability for systems marked "in progress" are expected to be completed by the first public release of the UFS medium range weather application. In addition, the NCAR Cheyenne with the GNU compiler currently marked as Tier 2 will migrate to Tier 1 by Dec 2019 for UFS release.

Platform	Responsibility for tests	Test coverage	Status
NOAA WCOSS Dell P3 with default Intel 18 software stack	EMC	EMC-PROD tests (rt.conf)	Implemented
NOAA WCOSS Cray with default Intel 16 software stack	EMC	EMC-PROD tests (rt.conf)	Implemented
NOAA RDHPC Hera with default Intel 18 software stack	EMC	EMC-PROD tests (rt.conf)	Implemented
NOAA RDHPC Gaea with default Intel 16 software stack (bcs of WCOSS Cray Intel 16)	EMC (or GFDL?)	ECM-PROD tests (rt.conf)	In progress
NOAA RDHPC Gaea with default Intel18 software stack	EMC (or GFDL?)	EMC-PROD tests (rt.conf)	In progress
NOAA RDHPC Jet with default Intel 18 software stack	EMC (or DTC?)	EMC-PROD tests (rt.conf)	In progress

Tier-2 platforms

Tier 2 platforms and compilers have been identified but the Tier 2 policy has not been implemented yet.

Platform	Responsibility for tests	Test coverage	Status
NCAR CISL Cheyenne with GNU 8.3.0	DTC	GMTB-DEV tests (rt_gmtb.conf)	Implemented
Orion (Mississippi) with default Intel XYZ software stack	EMC	GMTB-DEV tests (rt_gmtb.conf)	In progress
NCAR CISL Cheyenne with Intel19/SGI MPI software stack	DTC (proposed)	GMTB-DEV tests (rt_gmtb.conf)	In progress
NOAA RDHPCS Hera with GNU 9.1.0 software stack	TBD	GMTB-DEV tests (rt_gmtb.conf)	In progress
Linux platforms with GNU 9.1.0 compiler and MPICH 3.3.1 MPI library (cloud platforms?)	TBD	TBD	In progress
Linux platforms with Intel 19 compiler and MVAPICH2 2.3.2 MPI library (cloud platforms?)	TBD	GMTB-DEV tests (rt_gmtb.conf)	In progress
macOS platforms with LLVM clang 8.0.1 + GNU gfortran 8.3.0 compiler and mpich 3.3.1 MPI library	DTC (proposed)	TBD	In progress
macOS platforms with GNU gcc+gfortran 8.3.0 and mpich 3.3.1 MPI library	DTC (proposed)	TBD	In progress

Tier-3 platforms

Platform
PGI

Note about the PGI compiler: even though a compiler template is provided, the code managers may decide to remove workarounds specifically for the PGI compiler from the codebase; in this case the code compiler may decide to provide notes (e.g. in the form of a README) on the modifications that were removed from the code.

A few other platforms and compilers have been identified for possible addition to Tier 3 in the future

• Linux platforms with other combinations and/or other versions of the Intel or GNU compiler and MPI libraries than listed above.
• NAG compiler.
• clang/flang compiler: currently an open source development, the flang compiler is designed as a Fortran front-end for the LLVM clang compiler and may provide an interesting alternative in the future if/once matured (see this link for more information)