Parallel gridded simulation framework for DSSAT-CSM (version 4.7.5.21) using MPI and NetCDF

Abstract. The Decision Support System for Agrotechnology Transfer Cropping Systems Model (DSSAT-CSM) is a widely used crop modeling system that has been integrated into large-scale frameworks. Existing frameworks generate spatially explicit simulated outputs at grid points through an inefficient process of translation from binary referenced inputs to point-specific text input files, followed by and aggregation back output files outputs. main objective this paper was document the design implementation parallel gridded simulation framework DSSAT-CSM. A secondary provide preliminary analysis execution time scaling new framework. includes improved code model-internal data transfer, input–output with Network Common Data Form (NetCDF) library, parallelization simulations using Message Passing Interface (MPI). Validation DSSAT-CSM-CROPSIM-CERES-Wheat model revealed subtle discrepancies in yield due rounding soil parameters routines standard Utilizing NetCDF direct produced 3.7- 4-fold reduction compared R- text-based input–output. Parallelization both versions between 12.2- (standard version) 13.4-fold (parallel speed-up when comparing 1 16 compute cores. Estimates computation ranged 99.2 % 97.3 version), indicating potential higher numbers