80 строки
3.2 KiB
C
80 строки
3.2 KiB
C
/*
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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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*/
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#include "nbc_internal.h"
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/* a scatterv 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_Iscatterv */
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int ompi_coll_libnbc_iscatterv(void* sendbuf, int *sendcounts, int *displs, MPI_Datatype sendtype,
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void* recvbuf, int recvcount, MPI_Datatype recvtype, int root,
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struct ompi_communicator_t *comm, ompi_request_t ** request,
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struct mca_coll_base_module_2_0_0_t *module) {
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int rank, p, res, i;
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MPI_Aint sndext;
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NBC_Schedule *schedule;
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char *sbuf, inplace;
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NBC_Handle *handle;
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ompi_coll_libnbc_request_t **coll_req = (ompi_coll_libnbc_request_t**) request;
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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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res = NBC_Init_handle(comm, coll_req, libnbc_module);
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if(res != NBC_OK) { printf("Error in NBC_Init_handle(%i)\n", res); return res; }
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handle = (*coll_req);
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res = MPI_Comm_rank(comm, &rank);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
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res = MPI_Comm_size(comm, &p);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_size() (%i)\n", res); return res; }
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res = MPI_Type_extent(sendtype, &sndext);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
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schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
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if (NULL == schedule) { printf("Error in malloc()\n"); return res; }
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handle->tmpbuf=NULL;
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res = NBC_Sched_create(schedule);
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if(res != NBC_OK) { printf("Error in NBC_Sched_create (%i)\n", res); return res; }
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/* receive from root */
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if(rank != root) {
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/* recv msg from root */
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res = NBC_Sched_recv(recvbuf, false, recvcount, recvtype, root, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
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} else {
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for(i=0;i<p;i++) {
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sbuf = ((char *)sendbuf) + (displs[i]*sndext);
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if(i == root) {
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if(!inplace) {
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/* if I am the root - just copy the message */
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res = NBC_Copy(sbuf, sendcounts[i], sendtype, recvbuf, recvcount, recvtype, comm);
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if (NBC_OK != res) { printf("Error in NBC_Copy() (%i)\n", res); return res; }
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}
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} else {
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/* root sends the right buffer to the right receiver */
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res = NBC_Sched_send(sbuf, false, sendcounts[i], sendtype, i, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); 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 (NBC_OK != res) { printf("Error in NBC_Sched_commit() (%i)\n", res); return res; }
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res = NBC_Start(handle, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Start() (%i)\n", res); return res; }
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return NBC_OK;
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}
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