GEOS-Chem Support Team Activities Bob Yantosca Senior Software Engineer Harvard School of Engineering and Applied Sciences Cambridge, MA, USA IGC7, 04.

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Presentation transcript:

GEOS-Chem Support Team Activities Bob Yantosca Senior Software Engineer Harvard School of Engineering and Applied Sciences Cambridge, MA, USA IGC7, 04 May 2015

GCST MemberAffiliationProjects Bob YantoscaHarvardSoftware development and validation User support and documentation High-performance computing Project management Melissa SulprizioHarvardSoftware development and validation User support and documentation Research project support Benchmarking new GC versions Matt YannettiHarvardSoftware development and validation User support and documentation High-performance computing Electronic media management Lizzie LundgrenHarvardSoftware development and validation User support and documentation Benchmarking new GC versions Mike Long (off-site)HarvardHigh-performance computing Integrating GC into NASA GEOS-DAS system Junwei XuDalhousieData processing and storage Processing GMAO met fields for input into GC Yanko DavilaColorado Boulder GC Adjoint development and validation GC Adjoint documentation and training GC Adjoint user support Meet the GEOS-Chem Support Team (aka GCST)

GCST supports the GC user community User support Welcoming new users to the GC community Providing technical assistance to GC users Distributing met fields & other data for input into GC Developing supporting software (eg GAMAP) Documentation, communication, & education GC Manual (manual.geos-chem.org) GC Adjoint Manual (wiki.geos-chem.org/GEOS-Chem_Adjoint) GC Wiki (wiki.geos-chem.org) Quarterly e-Newsletters blasts Adding user-submitted code into GC Enforcing version control (with Git) Maintaining public source code repositories Debugging & testing Validating & benchmarking (more in a couple slides)

GCST helps to ensure the integrity of GC Debugging and validation Unit tests: Short runs designed to reveal errors Difference tests: Ensures that purely structural changes do not adversely impact scientific results UT’s & DT’s are done before benchmark simulations 1-year benchmark simulations Full-chemistry + UCX, 4x5, GEOS-FP met for year 2013 Done before each public release of GC (or sooner) Compared to prior 1-year benchmarks plus obs. Approval process same as for 1-month benchmarks 1-month benchmark simulations Full-chemistry + UCX, 4x5 GEOS-FP met, for July 2013 Done after each new feature is added to GC Ratios, concentrations, differences are compared to the previous 1-month benchmark GCSC, developers, and interested users analyze and comment on benchmark results Final approval is by Model Scientist

GCST does fundamental software engineering High-performance computing (HPC) Integrating GC into the NASA GEOS5-DAS (M. Long, GCST) Using Earth System Model Framework / MPI Running very high resolution simulations (7km) Creating GEOS-Chem HP A standalone GC using ESMF/MPI for HPC clusters Cooperative development with GEOS-CTM (A. Molod) HEMCO: Harvard-NASA Emissions Component by Christoph Keller, GCST, and NASA/GMAO Combines emissions inventories in a flexible manner Removes hardwired legacy emissions code Reads data from input files in netCDF format Improving the efficiency of GC simulations KPPA fast chemistry solver (J. Linford, ParaTools) Reducing GC’s memory footprint (M. Yannetti, GCST) Consistent units throughout GC (L. Lundgren, GCST) NetCDF diagnostics (GCST)

For more info Come to the IGC7 Model Clinics (5PM tonight) – GEOS-Chem for Beginners – GEOS-Chem for Intermediate/Advanced users + HEMCO – GEOS-Chem in Massively Parallel and ESM Environments – GEOS-Chem Adjoint Anytime – GEOS-Chem wiki (wiki.geos-chem.org) – GEOS-Chem website ( Contact us – –

Extra slides

Code validation – scanning for bugs! GCST performs a set of unit tests each time a new feature is added. Unit tests are short simulations designed to catch common mistakes in source code. Unit tests are automatic and can run overnight. Results are posted online. See: GCST also performs difference tests to ensure that purely structural updates to GEOS-Chem do not change any scientific results. A difference test compares the current state of the code against a prior state.