CMCC-NEMO - 2016 actions

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members

Name	Institution	%	Position
Dorotea Iovino	CMCC	40	NEMO Officer
Stefania Ciliberti	CMCC	20	Scientist
Tomas Lovato	CMCC	20	Scientist
Silvia Mocavero	CMCC	20	Scientist
Andrea Storto	CMCC	0	Scientist

Summary: List here the actions NOT listed in SHARED ACTIONS

Action

Brief description

Status

Branch name

Trac ticket n°

Wiki page name

Reviewer(s)

Review status

Summary of SHARED ACTIONS (listed here for continuity)

Action	Brief description	Status	Branch name	Trac ticket n°	Wiki page name	Reviewer(s)	Review status	Shared Action Stream
CMCC-1	Scalability with MPI-OPENMP
CMCC-2	Suppress Global Comms (mpp_sum etc)
CMCC-3	BDY for nested limited area models
CMCC-4	BDY tool development and tests							ConfigMan?-2
CMCC-5	Remove key_mpp_rep					Gurvan Madec		SIMPLIF-3
CMCC-6	Remove key_bdy macro					Gurvan Madec		SIMPLIF-4
CMCC-7	Generalize bdy structure					C. Ethé		ROBUST-5

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CMCC-1 - Scalability with MPI-OPENMP

Motivation: Improve 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 : S. Mocavero (silvia.mocavero@…)

CMCC-2 - Suppress global communications

Motivation: Removing global communications could help improve the speed of NEMO
Status : Not started
Main tasks : CMCC will investigate which communications could be safely removed. Met Office will look at a more efficient implementation of functionality in stp_ctl.
Science Reviewer:
System Reviewer:
Deadline:
Priority: HIGH
Depends on:
Principal Investigator : S. Mocavero (silvia.mocavero@…) and Tim Graham

CMCC-3 - BDY for nested limited area models

Motivation: Improving nesting techniques for regional and sub-regional circulation models nested into coarser models
Status :
Main tasks : 1. Implementation of the generalised Flather’s condition for the barotropic component (Oddo & Pinardi, 2008); 2. Interpolation Constraint applied to total velocity field for preserving the transport conservation across open boundaries
Science Reviewer: Prof. N. Pinardi (University of Bologna)
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator : Stefania Ciliberti (stefania.ciliberti@…)

CMCC-4 - BDY tool development and tests

Motivation: Producing an on-the-fly computation of boundary datasets compatible with BDY module for open boundary conditions
Status :
Main tasks : NERC will finish last improvement of the BDY tool and add some documentation, and CMCC will test the BDY tool on regional configurations
Science Reviewer:
System Reviewer:
Deadline:
Priority:
Depends on:
Principal Investigator : Stefania Ciliberti (stefania.ciliberti@…) and James Harle (jdha@…)

CMCC-5 - Remove key_mpp_rep (SIMPLIF-3)

Motivation: Set the use of MPI safe computation as a default
Status :
Main tasks : remove the use of the macro key_mpp_rep and use as a default condition the MPI safe communications
Science Reviewer: Gurvan Madec
System Reviewer: Gurvan Madec
Deadline:
Priority:
Depends on:
Principal Investigator : Dorotea Iovino (diovino@…)

CMCC-6 - Remove key_bdy macro (SIMPLIF-4)

Motivation: reduce the use of macros in NEMO
Status :
Main tasks : Remove the macro activating the code for the open boundary treatment in favour of static code always present in compilation and activated only when bdy are required by the user configuration
Science Reviewer: Gurvan Madec
System Reviewer: Gurvan Madec
Deadline:
Priority:
Depends on:
Principal Investigator : Tomas Lovato (tomas.lovato@…)

CMCC-7 - Revise bdy structure (ROBUST-5)

Motivation: Generalise the structure of BDY schemes used by OPA and TOP
Status :
Main tasks : Revise the code structure of available open boundary conditions in order to have generalised schemes in one place that can be used for either active and passive tracers (like e.g. for the advection)
Science Reviewer: C. Ethé
System Reviewer: C. Ethé
Deadline:
Priority:
Depends on:
Principal Investigator : Tomas Lovato (tomas.lovato@…)