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NEMO 2016 workplan - Shared actions

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lime

Inputs from working groups:

Summary of Shared Actions:

Action Brief description Status end 2016 Institution PI
AGRIF
AGRIF-1 Continue vertical grid refinement from 2015 Met Office Tim Graham
AGRIF-2 AGRIF + LIM3 CNRS Clément Rousset
AGRIF-3 AGRIF + VVL (2 way nesting) Mercator Océan Jérôme Chanut
HPC
HPC-1 Suppress Global Comms (mpp_sum etc)* CMCC/Met Office Silvia Mocavero/Tim? Graham
HPC-2 Gather communications* Barcelona Miguel Castrillo
HPC-3 Suppress useless comms* Met Office Tim Graham
HPC-4 Scalability with MPI-OPENMP CMCC Silvia Mocavero
Config. Manager
CONFIGMAN-1 SIREN improvement and robustness MERCATOR julien PAUL
CONFIGMAN-2 BDY tool developpement and tests NERC/CMCC james HARLE, stefania CILIBERTI
System simplification
SIMPLIF-1 Simplification of vertical diffusion CNRS Gurvan Madec
Wave coupling
WAVE-1 Improvements in wave-current interaction processes implementation INGV Emanuela Clementi
WAVE-2 Definition of wave-current interaction processes at small (coastal) scale INGV Emanuela Clementi
NEMO robustness
ROBUST-1 Integration of the seabass configuration as a test case CNRS Pierre-Antoine Bouttier
ROBUST-2 Improving EEN scheme for partial steps
ROBUST-3 Academic test case in the system CNRS Simona Flavoni
ROBUST-4 Passive tracers run offline with variable volume CNRS Christian Ethé
ROBUST-5 Revisiting TOP interface CNRS Christian Ethé
ROBUST-6 Continuous integration tool ('Trusting') CNRS Nicolas Martin
ROBUST-7 BDY for nested limited area models CMCC Stefania Ciliberti
ROBUST-8 Improve split-explicit free surface Mercator Océan Jérôme Chanut
GMD Special Issue

AGRIF

AGRIF-1 / Met Office - Increased vertical resolution with AGRIF

Motivation: Vertical grid refinement in NEMO would be a useful tool in simulating some aspects of the ocean (e.g. overflows)
Status: Started in 2015 but much more work to do
Main Tasks:
Science Reviewer:
System Reviewer:
Deadline:
Priority: Medium
Tim Graham Depends on:
Principal Investigator :

AGRIF-3 / Mercator Océan - Agrif + vvl (two way nesting)

Motivation: Enable the use of agrif with temporally varying vertical grid (e.g. with zstar or ztilde coordinates)
Status: Started in 2015. One way nesting is ok, two way nesting needs to be finalized.
Main Tasks:
Science Reviewer:
System Reviewer:
Deadline:
Priority: High
Depends on:
Principal Investigator : Jérôme Chanut

HPC

HPC-1 / CMCC/Met Office - Suppress global communications

Motivation: Removing global communications could help improve the speed of NEMO
Status: Not started
Main Tasks: Silvia Mocavero to investigate which communications could be safely removed. Tim Graham to look at a more efficient implementation of functionality in stp_ctl.
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator : Silvia Mocavero/Tim? Graham

HPC-2 / Barcelona - Gather communications

Motivation: Grouping communications (lbc_lnk) together is more efficient than several separate lbc_lnk calls.

Status: lbc_lnk_multi in 3.6
Main Tasks: Extend functionality of lbc_lnk_multi to 3D (or 4D variables). Find calls to lbc_lnk that can be replaced with lbc_lnk_multi.
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator : Miguel Castrillo

HPC-3 / Barcelona - Suppress useless communications

Motivation: Suppress unnecessary calls to lbc_lnk.


Status:
Main Tasks: Use a script to search for and test impact of removing lbc_lnk calls from the model code. Determine whether communications used for diagnostic purposes can be suppressed.
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator : Tim Graham

HPC-4 / CMCC - Scalability with MPI-OPENMP

Motivation: Improving NEMO scalability.


Status: continuation of 2015 dev CMCC-1
Main Tasks: 1. the activity started at the end of 2013 with the analysis of three OpenMP approaches (implemented using “mini-apps”) on several multicore architectures; the second step was the implementation of the hybrid version of the GYRE configuration using the best OpenMP approach. Results in terms of scalability were not so good. Thus, the porting and the analysis of the hybrid version (using “mini-apps”) on many core architectures (e.g. Xeon Phi) is needed, before extending the hybrid OpenMP/MPI approach to the entire code, in order to justify the effort of the development. This analysis is carrying out in 2015. The extension of the hybrid implementation on the entire code will depend on the results of this analysis. 2. analysis of scalability improvement using MPI3 new communications (e.g. collective neighbours communications), instead of point to point communications
Science Reviewer:
System Reviewer:
Deadline:
Priority: HIGH
Depends on: results of the same action in 2015
Principal Investigator : Silvia Mocavero

Configuration Manager

ConfigMan-1 / MERCATOR - SIREN improvement and robustness

Motivation:

  • test SIREN code (working group members and maybe some external users)
  • extract from NEMO the meshmask creation (Mercator-Océan)
  • main program (python) to manage all SIREN codes (Mercator-Océan)
  • improve documentation readibility, and add tutorial (Mercator-Océan)


Status:
Main Tasks:
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator : julien PAUL

ConfigMan-2 / NERC/CMCC - BDY tool developpement and tests

Motivation:

  • finish last improvement of the BDY tool and add some documentation (NERC)
  • test BDY tool (CMCC)


Status:
Main Tasks:
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator : james HARLE, stefania CILIBERTI

SIMPLIFICATION

SIMPLIF-1 / institution - title

Motivation:
Status:
Main Tasks:
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator :

Wave Coupling

WAVE-1 / INGV - Improvements in wave-current interaction processes implementation

Motivation: INGV is responsible for the WAVE-WG and will continue improving the wave-current interaction processes implementation according to the WG needs.
Status : Implementation of some of the identified processes has been started in 2014 and 2015. To be continued in 2016
Main tasks : Continue the implementation of already defined wave-current processes, if not completed in previous year. Meeting organization with the WAVE-WG to discuss further issues to be investigated and implemented:

  • Vertical mixing enhancement due to wave breaking;
  • Contribute to the discussion on implementation of Langmuir circulation;
  • Contribute to the discussion on wave-sea ice coupling; ;
  • others if agreed by the WAVE-WG.

Science Reviewer:
System Reviewer:
Deadline:
Priority: high
Depends on:
Principal Investigator: Emanuela Clementi (emanuela.clementi@…)

WAVE-2 / INGV - Definition of wave-current interaction processes at small (coastal) scale

Motivation: According to the WAVE-WG, in order to achieve a full wave-current coupling, the small (coastal) scale processes need to be investigated.
Status : To be continued in 2016
Main tasks : Contribute, within the WAVE-WG, in the analysis of this issue in order to finalize the discussion started in 2014 before proceeding with any new implementation
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator: Emanuela Clementi (emanuela.clementi@…)

ROBUSTNESS

ROBUSTNESS-1 / CNRS - INTEGRATION OF THE SEABASS CONFIGURATION AS A TEST CASE

Motivation: SEABASS is the reference configuration for Data Assimilation, included in the NEMO v3.4_STABLE version. Various data assimilation experiments have been done with this configuration, with various data assimilation systems (e.g. Cosme et al, 2011, Bouttier et al. 2014, Yin et al., 2014). In this context, this configuration appears to be useful for data assimilation users, to couple their own DA system on NEMO and compare their results with thgose obtained on this configuration. SEABASS is also easy to take in hand. Also, it allows to update the configuration status to the future version of NEMO. For these reasons, this configuration is a relevant test case for Data Assimilation.
Status:
Main Tasks:
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator: Pierre-Antoine Bouttier

ROBUSTNESS-8 / Mercator Océan - Improve split-explicit free surface

Motivation: There are several aspects that need to be investigated concerning the robustness of current split-explicit algorithm:

  • Tracer conservation issues (all time splitting options do not ensure global and local tracer conservation).
  • Missing correction terms in the barotropic equations relative to internal pressure gradients. This would reduce mode splitting error, hence improve stability.
  • Work on the stability of barotropic time stepping (based on INRIA's work) to possibly remove time filtering of barotropic variables. This would limit the temporal dissipation and greatly ease online coupling of nested domains at barotropic level (with AGRIF).

Status:
Main Tasks:
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator: Jérôme Chanut