MareNostrum 5

MareNostrum 5 Lustre MDT Contention & Astral uv Benchmark

Eliminating the Conda Bottleneck on HPC: Fast Python & Climate Workflows with uv on Lustre

We’ve all watched a 64-node Slurm job stall for three minutes just importing xarray. Here is why standard Conda environments choke parallel filesystems like Lustre, and how pairing Astral uv with system LMOD modules eliminates job startup lag on MareNostrum 5.

MareNostrum 5 Autosubmit Ensemble DAG Architecture

Running Decadal Climate Ensembles on Tier-0 HPC: Autosubmit DAGs, Lustre Striping, and Cluster Telemetry

Engineering lessons from managing multi-member Earth system model ensembles on MareNostrum 5: orchestrating DAGs with Autosubmit, tuning Lustre striping for NetCDF outputs, and NUMA-aware MPI rank placement.