E3SM-Project / E3SM-Project/scorpio
Make sure we have all the necessary hints for PnetCDF
Open
enhancement
High Priority
Next Release
Perf
- Dominant language
- C++
- Stars
- 22
- Forks
- 20
- Avg merge
- 12d 19m
- Merged PRs (30d)
- 1
Description
PIO2 no longer sets some hints for PnetCDF + Lustre that were
used in PIO1. For example PIO2 no longer disables romio
optimizations (due to high file locking costs in Lustre) using
the following MPI hints on Lustre,
```
'romio_ds_read','disable'
'romio_ds_write','disable'
'striping_factor", '32'
"striping_unit", '1024'
```
Investigate if these hints are required (and if needed, reintroduce
them)
Also see - https://trac.mcs.anl.gov/projects/parallel-netcdf/wiki/HintsForPnetcdf
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