PMIx Tools WG - Meeting 10 - February 2nd 2022

[Isaías Alberto Comprés Ureña]

Hello everyone,

This is a friendly reminder: our 10th meeting will take place today at the usual time (17:00 Berlin time).

[Isaías Alberto Comprés Ureña]

On this occasion, we had a shorter meeting with a single topic.  Please find the minutes below.  Please do not hesitate to add any details.

Participants:

Ralph Castain

Simon Pickartz

Thomas Moschny

Isaias Compres

Josh Hursey

Josef Weidendorfer

Bulk operations and transactions

- Bulk operation: set of operations that are performed as a unit.

  - The effect of all operations are applied simultaneously

   - This is useful when the changes to the state are only consistent when all operations are performed

   - More likely necessary on malleability, and not during process wire-up 

     - During wire-up, usually critical state is set before a process is forked by a process manager

     - In malleable setups, all resource/allocation state need to be updated together to ensure consistency

- It is not clear whether this is needed at the PMIx level or runtime system level 

- It is possible that no PMIx APIs need to be updated

  - Instead, the bulk operations can be implemented by implementations, such as Open PMIx

  - This will be verified via prototyping

- Possible relationship with transactions: 

  - bulk operations could be committed or aborted, based on runtime system and process manager interactions.

Organisational:

- Next meeting: March 2nd 2022