Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 Enhancing SegHidro/BRAMS experience through EELA José Flávio M. V. Júnior Paulo Ricardo M. Gomes

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 Introduction to SegHidro Segurança Hídrica Aims at improving water management Brazilian Northeast – Semi-Arid Region Provides a Grid Portal Helps researchers and decision-makers Better management of water resources Coupling of hydro-meteorological models

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 SegHidro Portal Web-based framework to run simulations Coupling of computational models Need for computational power OurGrid middleware –Open, Free-to-Join, Cooperative –Supports Bag-of-Tasks (BoT) applications Easy interface to use the grid

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 SegHidro Interface Products/Applications

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 Introduction to BRAMS Brazilian Regional Atmospheric Modeling System Numerical prediction model Simulates atmospheric circulations on limited areas Based on RAMS Targets PC Clusters under Linux Open-Source

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 BRAMS – Compilation and Setup Based on C and Fortran 90 Compiling tests : Intel and GNU Compilers Best option: Intel Compilers (free for non- commercial use) Alternative: Portland Group Compilers Necessary libraries: HDF and MPI(mpich)

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 BRAMS – Execution Steps: –1. Conversion into a format that BRAMS understands (GRIB2DP) –2. BRAMS MAKEVFILE MODE –3. BRAMS INITIAL MODE MPI mode is evoked –4. Post-Processing (RAMSPOST50) –5. Image generation (GrADS)

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 BRAMS – Execution Execution Diagram

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 SegHidro/BRAMS – Daily Production BRAMS Daily forecasting datasets

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 SegHidro/BRAMS – Daily Production 2 HP Clusters – 10 Nodes Double Intel Xeon 2.4Ghz processors each node 6 Day Forecasting ~ 9 Hours 15 Day Forecasting ~ 23 Hours Output data is published on a server and in a data catalog that are used by the portal

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 SegHidro/BRAMS – Meteorologic Portlet Validation –Parameters –Data Availability Data automatically downloaded, everyday, and stored on a server shared via NFS by special grid nodes Simulation is sent to OurGrid via API Job Description –Selects appropriate machines –Decides which mode will BRAMS run: Parallel(MPI) or Sequential(one processor)

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 SegHidro/EELA Current grid infrastructure: OurGrid –Resource availability –Great for independent tasks No direct support to tightly-coupled applications(MPI) Meteorologic Portlets perfomance will depend on grids cluster availability Grid community formed mainly by desktop computers, clusters generally busy running daily production MPI support from EELA Grid Infrastructure

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 SegHidro/EELA Porting steps: –Get acquainted with EELAs gLite middleware –Explore gLites components, in order to optimize the run and make the new system compatible with the Portal architecture –Finally, make SegHidros and gLites API communicate

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 Expectations Enhance SegHidro Portal performance SegHidro Team will acquire useful Grid knowledge Relationship narrowing between EELA and LSD, UFCG

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 Questions?

Laboratório de Sistemas Distribuídos (LSD) – Universidade Federal de Campina Grande (UFCG)EELA Grid School – December 04, 2006 Thank you! Merci! Danke! Grazie! Gracias! Obrigado!