= Name and subject of the action

Last edition: '''[[Wikinfo(changed_ts)]]''' by '''[[Wikinfo(changed_by)]]'''

The PI is responsible to closely follow the progress of the action, 
and especially to contact NEMO project manager if 
the delay on preview (or review) are longer than the 2 weeks expected.

[[PageOutline(2, , inline)]]

== Summary

||=Action       || Halo Management tool                      ||
||=PI(S)        || Italo Epicoco, Francesca Mele                                                 ||
||=Digest       || This task concerns the development of an Halo Management tool to provide the use of different halo sizes (>2) for some NEMO Kernel that can benefit of it    ||
||=Dependencies || Communications cleanup                                                ||
||=Branch       || source:/NEMO/branches/{YEAR}/dev_r{REV}_{ACTION_NAME} ||
||=Previewer(s) || TBD                                                 ||
||=Reviewer(s)  || TBD                                                 ||
||=Ticket       || #2610                                                 ||

=== Description

The halo management tool aims to provide the possibility to use different halo sizes for different NEMO Kernels that can benefit of it, i.e. in the dynspg_ts routine it could be convenient to enlarge the halo region (from 3 up to 5 lines or more) to reduce the communication steps in the time sub-stepping loop.[[BR]]
In a wider halo region the overall communication costs reduce but the computation costs grow. However, the use of an extended halo is required to efficiently use the tiling approach.[[BR]]
The activities carried out this year have been manly linked to the analysis and evaluation of the cost/benefit ratio and bug-fixes. 

=== Implementation

{{{#!box width=35em help
Describe flow chart of the changes in the code. \\
List the Fortran modules and subroutines to be created/edited/deleted. \\
Detailed list of new variables to be defined (including namelists), \\
give for each the chosen name and description wrt coding rules.
}}}

''...''

=== Documentation updates

{{{#!box width=55em help
Using previous parts, define the main changes to be done in the NEMO literature 
(manuals, guide, web pages, …).
}}}

''...''

== Preview 

{{{#!box width=50em info
[[Include(wiki:Developers/DevProcess#preview_)]]
}}}

''...''

== Tests

{{{#!box width=50em info
[[Include(wiki:Developers/DevProcess#tests)]]
}}}

''...''

== Review

{{{#!box width=50em info
[[Include(wiki:Developers/DevProcess#review)]]
}}}

''...''