File: coll_ucc_reduce_scatter.c

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openmpi 5.0.7-1
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/**
 * Copyright (c) 2021 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2022 NVIDIA Corporation. All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 */

#include "coll_ucc_common.h"

static inline
ucc_status_t mca_coll_ucc_reduce_scatter_init(const void *sbuf, void *rbuf, const int *rcounts,
                                              struct ompi_datatype_t *dtype,
                                              struct ompi_op_t *op, mca_coll_ucc_module_t *ucc_module,
                                              ucc_coll_req_h *req,
                                              mca_coll_ucc_req_t *coll_req)
{
    ucc_datatype_t ucc_dt;
    ucc_reduction_op_t ucc_op;
    size_t total_count;
    int i;
    int comm_size = ompi_comm_size(ucc_module->comm);

    if (MPI_IN_PLACE == sbuf) {
        /* TODO: UCC defines inplace differently:
           data in rbuf of rank R is shifted by R * rcount */
        UCC_VERBOSE(5, "inplace reduce_scatter is not supported");
        return UCC_ERR_NOT_SUPPORTED;
    }

    ucc_dt = ompi_dtype_to_ucc_dtype(dtype);
    ucc_op = ompi_op_to_ucc_op(op);
    if (OPAL_UNLIKELY(COLL_UCC_DT_UNSUPPORTED == ucc_dt)) {
        UCC_VERBOSE(5, "ompi_datatype is not supported: dtype = %s",
                    dtype->super.name);
        goto fallback;
    }
    if (OPAL_UNLIKELY(COLL_UCC_OP_UNSUPPORTED == ucc_op)) {
        UCC_VERBOSE(5, "ompi_op is not supported: op = %s",
                    op->o_name);
        goto fallback;
    }
    total_count = 0;
    for (i = 0; i < comm_size; i++) {
        total_count += rcounts[i];
    }

    ucc_coll_args_t coll = {
        .mask      = 0,
        .flags     = 0,
        .coll_type = UCC_COLL_TYPE_REDUCE_SCATTERV,
        .src.info = {
            .buffer   = (void*)sbuf,
            .count    = total_count,
            .datatype = ucc_dt,
            .mem_type = UCC_MEMORY_TYPE_UNKNOWN
        },
        .dst.info_v = {
            .buffer   = rbuf,
            .counts   = (ucc_count_t*)rcounts,
            .datatype = ucc_dt,
            .mem_type = UCC_MEMORY_TYPE_UNKNOWN
        },
        .op = ucc_op,
    };
    COLL_UCC_REQ_INIT(coll_req, req, coll, ucc_module);
    return UCC_OK;
fallback:
    return UCC_ERR_NOT_SUPPORTED;
}

int mca_coll_ucc_reduce_scatter(const void *sbuf, void *rbuf, const int *rcounts,
                                struct ompi_datatype_t *dtype,
                                struct ompi_op_t *op,
                                struct ompi_communicator_t *comm,
                                mca_coll_base_module_t *module)
{
    mca_coll_ucc_module_t *ucc_module = (mca_coll_ucc_module_t*)module;
    ucc_coll_req_h         req;

    UCC_VERBOSE(3, "running ucc reduce_scatter");
    COLL_UCC_CHECK(mca_coll_ucc_reduce_scatter_init(sbuf, rbuf, rcounts, dtype,
                                                    op, ucc_module, &req, NULL));
    COLL_UCC_POST_AND_CHECK(req);
    COLL_UCC_CHECK(coll_ucc_req_wait(req));
    return OMPI_SUCCESS;
fallback:
    UCC_VERBOSE(3, "running fallback reduce_scatter");
    return mca_coll_ucc_call_previous(reduce_scatter, ucc_module,
        sbuf, rbuf, rcounts, dtype, op, comm);
}

int mca_coll_ucc_ireduce_scatter(const void *sbuf, void *rbuf, const int *rcounts,
                                 struct ompi_datatype_t *dtype,
                                 struct ompi_op_t *op,
                                 struct ompi_communicator_t *comm,
                                 ompi_request_t** request,
                                 mca_coll_base_module_t *module)
{
    mca_coll_ucc_module_t *ucc_module = (mca_coll_ucc_module_t*)module;
    ucc_coll_req_h         req;
    mca_coll_ucc_req_t    *coll_req = NULL;

    UCC_VERBOSE(3, "running ucc ireduce_scatter");
    COLL_UCC_GET_REQ(coll_req);
    COLL_UCC_CHECK(mca_coll_ucc_reduce_scatter_init(sbuf, rbuf, rcounts, dtype,
                                                    op, ucc_module, &req, coll_req));
    COLL_UCC_POST_AND_CHECK(req);
    *request = &coll_req->super;
    return OMPI_SUCCESS;
fallback:
    UCC_VERBOSE(3, "running fallback ireduce_scatter");
    if (coll_req) {
        mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
    }
    return mca_coll_ucc_call_previous(ireduce_scatter, ucc_module,
        sbuf, rbuf, rcounts, dtype, op, comm, request);
}