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06 10 2020

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Manjunath Gorentla Venkata edited this page Jul 30, 2020 · 1 revision

Participants

  • Manjunath Gorentla Venkata
  • Sergey Lebedev
  • Valentin Petrov
  • Alex Margolin
  • Gil Bloch
  • Pavel Shamis
  • Naveen Ravi

Discussion on the UCC interface details

https://github.com/manjugv/ucc_wg_public/blob/master/docs/UCC_V1.0_API_Draft_gorentla.pdf

###Specific topics discussed

  • UCC thread model discussion
    • Should UCC support all four models - SINGLE, MULTIPLE, SERIALIZED, FUNNELED
    • Inclination towards supporting SINGLE, SERIALIZED, and MULTIPLE
  • BFloat16 vs FP16 datatype for reduction ?
    • What should UCC support ? BFloat16 or FP16 or both?
    • Need more input
  • Support for MPI_Comm_split with colors or the current UCC interface [2]
    • Research the current literature and state of art
  • When does buffer ownership transfer from user to library ?
    • Two models (1) Transfer after ucc_collective_init() (2) Transfer after ucc_collective_finalized()
    • Model 1 : Supports persistent collectives
    • Model 2 : Supports RDMA based implementation
  • Signature for OOB collective team creation
typedef struct ucc_team_oob_coll_t {
  int             (*allgather)(void *src_buf, void *recv_buf, size_t size,
                        void *allgather_info,  void **request);
  ucc_status_t    (*req_test)(void *request);
  ucc_status_t    (*req_free)(void *request);
  uint32_t 	  participants;
  void            *coll_info;
} ucc_team_oob_coll_t

Next Meeting

  • June 17th, 2020
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