183 строки
5.6 KiB
C
183 строки
5.6 KiB
C
/* -*- Mode: C; c-basic-offset:2 ; indent-tabs-mode:nil -*- */
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/*
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* Copyright (c) 2006 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2006 The Technical University of Chemnitz. All
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* rights reserved.
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*
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* Author(s): Torsten Hoefler <htor@cs.indiana.edu>
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*
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* Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2013-2015 Los Alamos National Security, LLC. All rights
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* reserved.
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* Copyright (c) 2014-2015 Research Organization for Information Science
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* and Technology (RIST). All rights reserved.
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*
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*/
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#include "nbc_internal.h"
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/* an allgatherv schedule can not be cached easily because the contents
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* ot the recvcounts array may change, so a comparison of the address
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* would not be sufficient ... we simply do not cache it */
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/* simple linear MPI_Iallgatherv
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* the algorithm uses p-1 rounds
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* first round:
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* each node sends to it's left node (rank+1)%p sendcount elements
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* each node begins with it's right node (rank-11)%p and receives from it recvcounts[(rank+1)%p] elements
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* second round:
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* each node sends to node (rank+2)%p sendcount elements
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* each node receives from node (rank-2)%p recvcounts[(rank+2)%p] elements */
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int ompi_coll_libnbc_iallgatherv(const void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, const int *recvcounts, const int *displs,
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MPI_Datatype recvtype, struct ompi_communicator_t *comm, ompi_request_t ** request,
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struct mca_coll_base_module_2_1_0_t *module)
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{
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int rank, p, res, speer, rpeer;
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MPI_Aint rcvext;
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NBC_Schedule *schedule;
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char *rbuf, *sbuf, inplace;
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NBC_Handle *handle;
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ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;
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NBC_IN_PLACE(sendbuf, recvbuf, inplace);
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rank = ompi_comm_rank (comm);
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p = ompi_comm_size (comm);
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res = ompi_datatype_type_extent (recvtype, &rcvext);
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if (OPAL_UNLIKELY(MPI_SUCCESS != res)) {
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NBC_Error ("MPI Error in ompi_datatype_type_extent() (%i)", res);
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return res;
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}
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if (inplace) {
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sendtype = recvtype;
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sendcount = recvcounts[rank];
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} else {
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/* copy my data to receive buffer */
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rbuf = (char *) recvbuf + displs[rank] * rcvext;
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res = NBC_Copy (sendbuf, sendcount, sendtype, rbuf, recvcounts[rank], recvtype, comm);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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return res;
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}
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}
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schedule = OBJ_NEW(NBC_Schedule);
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if (NULL == schedule) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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sbuf = (char *) recvbuf + displs[rank] * rcvext;
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/* do p-1 rounds */
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for (int r = 1 ; r < p ; ++r) {
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speer = (rank + r) % p;
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rpeer = (rank - r + p) % p;
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rbuf = (char *)recvbuf + displs[rpeer] * rcvext;
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res = NBC_Sched_recv (rbuf, false, recvcounts[rpeer], recvtype, rpeer, schedule, false);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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res = NBC_Sched_send (sbuf, false, sendcount, sendtype, speer, schedule, false);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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}
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res = NBC_Sched_commit (schedule);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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res = NBC_Init_handle (comm, &handle, libnbc_module);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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res = NBC_Start (handle, schedule);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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NBC_Return_handle (handle);
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return res;
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}
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*request = (ompi_request_t *) handle;
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return OMPI_SUCCESS;
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}
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int ompi_coll_libnbc_iallgatherv_inter(const void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, const int *recvcounts, const int *displs,
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MPI_Datatype recvtype, struct ompi_communicator_t *comm, ompi_request_t ** request,
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struct mca_coll_base_module_2_1_0_t *module)
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{
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int res, rsize;
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MPI_Aint rcvext;
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NBC_Schedule *schedule;
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NBC_Handle *handle;
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ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;
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rsize = ompi_comm_remote_size (comm);
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res = ompi_datatype_type_extent(recvtype, &rcvext);
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if (OPAL_UNLIKELY(MPI_SUCCESS != res)) {
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NBC_Error ("MPI Error in ompi_datatype_type_extent() (%i)", res);
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return res;
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}
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schedule = OBJ_NEW(NBC_Schedule);
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if (NULL == schedule) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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/* do rsize rounds */
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for (int r = 0 ; r < rsize ; ++r) {
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char *rbuf = (char *) recvbuf + displs[r] * rcvext;
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if (recvcounts[r]) {
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res = NBC_Sched_recv (rbuf, false, recvcounts[r], recvtype, r, schedule, false);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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}
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}
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if (sendcount) {
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for (int r = 0 ; r < rsize ; ++r) {
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res = NBC_Sched_send (sendbuf, false, sendcount, sendtype, r, schedule, false);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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}
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}
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res = NBC_Sched_commit (schedule);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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res = NBC_Init_handle (comm, &handle, libnbc_module);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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OBJ_RELEASE(schedule);
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return res;
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}
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res = NBC_Start (handle, schedule);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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NBC_Return_handle (handle);
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return res;
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}
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*request = (ompi_request_t *) handle;
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return OMPI_SUCCESS;
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}
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