Who’s Who#

Every member of the community acts in one or more roles, depending on the work at hand. These roles often align to different teams for practical purposes.

User#

Users, in general, are anticipated to:

  • Edit and manage rose suites via the roses repositories

  • Edit suite tasks to manage code version (including use of upgrade macros), branches, science configuration and other settings to their needs

  • Manage their usage of compute resource in-line with relevant guidance

  • Ensure the scientific integrity of their use case

Notably, users in this context do not edit source code.

Developer#

Developers, in general, build on the User role:

  • Write and edit source code

  • Follow the Working Practices, even if their work is not intended for the trunk.

  • Manage their work to allow reasonable time for approvals and reviews.

Notably, the Working Practices encourage and require engagement with other roles. This helps promote cohesion and consistency, ultimately underpinning confidence in the models as a whole.

Code Owner#

Code Owners and their deputies take responsibility for defined parts of the codebase:

  • Working knowledge of the code, and any supporting items such as metadata

  • Generally, focus will be on the scientific/functional aspects of the code, but also includes consideration of technical aspects with support from the Simulation Systems and Deployment Team

  • Oversee the general arc of development of their sections

  • Review and sign-off all changes to the code they own on an acceptable timescale

  • In some cases they may make suggestions regarding changes outside of their section

  • Often act as the Sci/Tech reviewer if their section is the primary focus of a change

Configuration Owner#

Configuration owners are people that have chosen to protect a model configuration (a specific arrangement on input settings and options) using the rose-stem test harness.

  • Working knowledge of the configuration

  • Generally, focus will be on the scientific/functional aspect of the configuration, but also includes consideration of technical aspects with support

  • Maintain, update and retire configurations to ensure they are relevant and useful

  • Will often be the owner or a experienced user of standalone science evaluation suites that may be used to understand the magnitude of changes in model evolution

  • Review and sign-off all changes to model output on an acceptable timescale

Importantly, rose-stem are the single source of truth for pass/fail protection of model evolution.

Sci/Tech Reviewer#

A Sci/Tech reviewer is assigned for every ticket and comprises the first stage of review that considers the change as a whole. Further details are linked from the Working Practices page. In some cases, the reviewer can delegate parts of the work to another person.

Reviews should be turned around on a reasonable timescale and follow the SciTech review guidance.

It is the responsibility of the developer to identify and arrange the Sci/Tech reviewer. Often they will be someone in the same team as the developer or the most relevant code owner.

Code Reviewer#

The Code Reviewer performs the 2nd stage of review for every ticket. Further details are described Working Practices page.

Reviews should be turned around on a reasonable timescale and follow the Code Review guidance.

It is the responsibility of the developer to arrange the code reviewer.

UM, LFRic Apps, JULES, UKCA and Shumlib reviews are arranged by contacting the Simulation Systems and Deployment Team.

LFRic Core reviews are arranged by contacting the Capability Development Team, or moving the ticket into “ready_for_code_review” state. Tickets in this state are allocated reviewers at the weekly team meeting.

Simulation Systems and Deployment Team#

The Simulation Systems and Deployment Team are responsible for the various codebases that comprise the Simulation Systems.

  • 4th line operational support to Met Office operational NWP system (excludes seasonal forecasting)

  • Support for the last 12 months worth of UM, JULES, UKCA and shumlib releases to Met Office and partners

  • Delivering releases and maintaining supporting infrastructure

  • Overseeing the Working Practices and supporting documentation and mandating their use

  • Curation of the trunks and supporting systems

  • Coordination and collaboration with other system owners to provide overall seamless support

  • Support for UM Climate Configurations

  • Support and releases for the Met Office Coupling Infrastructure (MOCI)

All efforts are delivered on a best-endeavors basis, with all requests being triaged. Team members contribute to work outside of this project.

The team can be contacted at umsysteam@metoffice.gov.uk.

Core Capability Development Team#

The Core Capability Development Team are responsible for the LFRic Infrastructure to support the Next Generation Modelling Systems.

The team can be contacted at corecapabilitydevelopmentteam@metoffice.gov.uk.

LFRic questions can also be directed to meto-lfric@metoffice.gov.uk. .. todo: flesh out the description here

HPC Optimisation Team#

The HPC optimistation team take a general lead in matters relating to compute performance of the UM, LFRic and other systems.

  • Examine and improve the performance and scalability of the UM and coupled models.

  • Develop and maintain GCOM, the communications layer used by the UM and other systems in the Met Office.

  • Development and support of the UM Packing/Unpacking?, Dump and I/O routines.

  • Benchmarking UM software for HPC evaluations/procurement.

  • Act as ‘code’ owners for performance-related aspects of the UM, notably OpenMP and compiler directives

The team can be contacted at Sci_Weath_hpc_opt@metoffice.gov.uk.

Partnerships Team#

The partnerships team are responsible for engagement and support with users and developers outside the Met Office.