Checkpoint/Restart for Lagrangian particle mesh with AMR in community code FLASH-X

TL;DR

This paper discusses the implementation of checkpoint-restart capabilities for Lagrangian particle mesh simulations with adaptive mesh refinement in FLASH-X, emphasizing cross-format compatibility and scalable I/O performance on heterogeneous architectures.

Contribution

It introduces design strategies for cross-format checkpointing in FLASH-X and presents scaling studies and new I/O optimization ideas for heterogeneous systems.

Findings

Successful cross-format checkpoint-restart implementation

Demonstrated strong and weak scaling of checkpoint I/O

Proposed new methods for improved I/O performance on heterogeneous architectures

Abstract

In this work we present the design decisions and advantages for accomplishing cross mesh format checkpoint-restart in community code FLASH-X. AMReX and Paramesh are the two AMR mesh formats developed and supported by FLASH-X. We also highlight strong and weak scaling study of existing HDF5 I/O checkpoint writing along with new ideas and results (presented during talk) for utilizing heterogeneous compute architectures for improved I/O performance.