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[[tpl-ukaea-slide]]

IMAS UDA Workshop

Introduction

Jonathan Hollocombe, Adam Parker, Stephen Dixon
November 20, 2023 — ITER

Contents

  • Motivation
  • Background
  • Schedule

Motivation

  • This workshop is aiming to give you an insight into what UDA is, how it works and how it can be used in IMAS to map experimental data
  • Experimental data in IMAS format is needed to validate ITER software and can help creating multi-machine databases for AI/ML
  • There will be hands-on session to cover how to set up a UDA server, develop JSON mappings and create a mapping plugin for your device
  • At the end of this workshop you should have the knowledge of the basic building blocks needed to develop mappings for any machine
  • Future training and documentation can build on this knowledge for machine specific cases

Background (UDA)

  • UDA — Universal Data Access (formerly known as IDAM) is a client-server technology originally created for the MAST experiment
  • Designed to separate data access and format from transferring that data across the network to a user
  • Dynamically loaded plugin architecture allows for data access plugins to be written without changing UDA core code
  • Consists C/C++ client library which talks to a C/C++ server running behind xinetd
  • Several higher level language wrappers available, the most popular of which is pyuda — the Python wrapper

Background (IMAS-UDA)

  • UDA has been used for several years to provide mapped data access in IMAS
  • Previous efforts have built upon existing work (EXP2ITM) and relied on somewhat shaky infrastructure stacks to enable this
  • With release of AL5 and introduction of IMAS URIs UDA can now be used to read IMAS data files remotely
  • Building on the improved UDA backend and plugins for AL5 the JSON mapping plugin is designed to provide a better way to write and manage the mappings for multiple machines

Schedule (Day 1)

Name Type Description
UDA Overview Presentation Detailing how UDA works to provide context for it's use in IMAS
IMAS UDA Presentation Detailing how UDA is used in IMAS remote data access and experimental data mapping
UDA Installation Presentation Covering installing and configuring a UDA server, plugin installation, and basic UDA usage

Schedule (Day 2)

Name Type Description
Data Mappings Presentation Overview of data mapping with UDA and the new JSON plugin
Data Mappings Hands-On Developing a new mapping file
MASTU Mapping Presentation Data mapping with UDA for MAST-U
Data Access Plugin Hands-On Developing a new machine specific plugin

Workshop Prerequisites

What we assume from attendees:

  • Basic knowledge on IMAS and particularly its data model
  • Interest in using UDA to map experimental data into IMAS
  • Some basic C/C++ & Python knowledge
  • Familiarity with Linux systems and command line usage

Workshop Information

  • Please ask questions during the presentations — any that can't be answered quickly can be discussed later or noted for expansion upon in future training materials
  • All hands-on work is designed to be done on the provided ITER training VMs
    • The material should work on other machines but may require the installation of some prerequisites and we probably can't support this during the workshop
  • Adam & I will be available for on-site questions and will try and answer on-line questions when we can. Stephen will be provided on-line support to provide additional support.
  • Please use Google docs for all questions and discussions

Logistics & Administration

  • WiFi -> choose "Guest wireless" and then "Login with your ITER account"
  • How-to connect to SDCC: https://confluence.iter.org/display/IMP/ITER+Computing+Cluster
  • Regular ITER bus lines to Aix (A, B, C) are departing at 17:45 from the parking lot in entrance C
  • Work site visit Tuesday afternoon at 15:45
  • Workshop dinner at the restaurant L'Orangerie in Hotel Aquabella (Aix-en-Provence) at 19:30
  • Updated agenda and links to Google docs and more information can be found on the Inidico page https://indico.iter.org/event/81/