Threads WG Meeting 01 19 2023

Meeting Agenda:

1. Discuss active topics and plans for reading
2. Discuss priority items for next discussion

Attendance:

Ravi, Naveen; Ozog, David M; Stewart, Lawrence; Sikich, Danielle; Jim Dinan; Barmawer, Syed Ismail Faizan; Okuno, William; Eberius, David; Manjunath Gorentla Venkata; Holland, Kieran; Rahman, Md; Potter, Brandon

Active discussion items

PRs available - waiting for official reading/vote:

• Signals
  • PR #489
  • Danielle is planning to take this up for reading
• PE-fence
  • PR #315
  • Change in use-case and less perf benefits
  • Not part of OSM-1.6 milestone
  • Planning to move into backlog
• Block interleaved communication
  • PR #448
  • Convert strided to support block strided
  • Jim still planning for OSM-1.6
• Noncontiguous communication
  • Issue #365
  • Owner - Jim
  • After discussion with spec committee
    • On-hold due to lack for applications
    • Need input from committee
  • Currently not part of OSM-1.6 milestone
• Sessions
  • Owner - Dave
  • PR #493
  • Planning to read during next meeting
  • Plans to improve wording before the official read
• Non-blocking Collectives
  • PR #456
  • Manju plans to read for OSM-1.6
  • Need reviews

Active topics needs write-up

• Local complete
  • Owner - Naveen
  • Potential to be part of OSM-1.6
• Performance variables
  • Owner - Wasi/David E
  • Plans for OSM-1.6

Errata

• Missing allreduce datatypes - No active issue created - general question on team allreduce datatype support - Some datatypes were missing
  • Need a note/errata againt the changelog
  • Jim clarified the reason for removing it from spec
    • Looks like short, unsigned char, char were removed for AND,OR,XOR based on language requirements
• PR #466
  • Missing changelog entry
  • Davi planning to fix the change log entry

Long-term active proposals:

• Memory Spaces
  • Active
  • Delayed and waiting for doc to be public
  • Jim, Dave, Wasi interested in the proposal
• Message aggregation
  • Important topic - but not sure about OSM-1.6
  • Looks like we will have multiple proposals
  • Need to discuss and evaluate all proposals
  • SHMEM Queues
    • Manju plans to setup a session
    • Need more discussion
  • HPE prposal - needs presentation
• GPU extensions
  • No official proposals yet
  • Only documentation on ROC_SHMEM and NVSHMEM
  • AMD interested in standardization
  • Portability seems questionable - need more discussion

Future topics for discussion and todo items:

• Asymmetric allocations, Wasi
• SHMEM Queues presentation, Manju
• Priority to cover GPU extensions, Brandon and Jim
• To send updated spaces proposal, Naveen