Conference notes for 2025 04 08

Lmod monthly 8 April 2025

loading full spider cache that includes module file contents itself
takes ~2.5 seconds (on Lustre + HHDs)
- based on ~13k modules shared by Bart Oldeman on EUM'25
- going with small + large spider cache
- one with module file contents, one without
- only load large spider cache when needed ("module load" commands)
- Tcl modules will present a challenge here
  - will be ignored initially, will do Lua-only version first
  - write raw Tcl text to /dev/shm and let tcl2lua consume that file instead
  - error reporting will need to be tested accordingly
  - semantics of cached loads option in Lmod will change
  - module file contents will also be provided by spider cache, not just existence of module files
Jens-Henrik @ JSC will test in their Jupyter notebook environment, where loading modules is currently quite slow
weird crash in Lmod when loading modules from EESSI
- see https://nam12.safelinks.protection.outlook.com/url=https%3A%2F%2Fgithub.com%2FEESSI%2Fsoftwarelayer%2Fissues%2F1014&data=05%7C02%7C%7Cbebc40dd0b044689f73e08dd76ae92c4%7C31d7e2a5bdd8414e9e97bea998ebdfe1%7C0%7C0%7C638797214359059419%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=3Bl2vag6nnAgrmJHUsaGVhnChT5gn2LJ99ZDvZd5ttw%3D&reserved=0