214 строки
7.4 KiB
C
214 строки
7.4 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; 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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* 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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* 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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#ifdef NBC_CACHE_SCHEDULE
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/* tree comparison function for schedule cache */
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int NBC_Scan_args_compare(NBC_Scan_args *a, NBC_Scan_args *b, void *param) {
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if ((a->sendbuf == b->sendbuf) &&
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(a->recvbuf == b->recvbuf) &&
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(a->count == b->count) &&
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(a->datatype == b->datatype) &&
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(a->op == b->op) ) {
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return 0;
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}
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if( a->sendbuf < b->sendbuf ) {
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return -1;
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}
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return 1;
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}
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#endif
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/* linear iexscan
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* working principle:
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* 1. each node (but node 0) receives from left neigbor
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* 2. performs op
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* 3. all but rank p-1 do sends to it's right neigbor and exits
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*
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*/
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int ompi_coll_libnbc_iexscan(const void* sendbuf, void* recvbuf, int count, MPI_Datatype datatype, MPI_Op op,
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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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int rank, p, res;
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MPI_Aint ext;
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NBC_Schedule *schedule;
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#ifdef NBC_CACHE_SCHEDULE
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NBC_Scan_args *args, *found, search;
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#endif
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char 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(datatype, &ext);
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if (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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res = NBC_Init_handle(comm, &handle, libnbc_module);
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if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
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return res;
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}
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if (inplace && rank < p - 1) {
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/* need more buffer space for the inplace case */
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handle->tmpbuf = malloc(ext * count * 2);
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} else {
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handle->tmpbuf = malloc(ext * count);
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}
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if (handle->tmpbuf == NULL) {
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NBC_Return_handle (handle);
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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#ifdef NBC_CACHE_SCHEDULE
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/* search schedule in communicator specific tree */
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search.sendbuf = sendbuf;
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search.recvbuf = recvbuf;
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search.count = count;
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search.datatype = datatype;
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search.op = op;
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found = (NBC_Scan_args *) hb_tree_search ((hb_tree *) libnbc_module->NBC_Dict[NBC_EXSCAN], &search);
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if (NULL == found) {
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#endif
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schedule = OBJ_NEW(NBC_Schedule);
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if (OPAL_UNLIKELY(NULL == schedule)) {
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NBC_Return_handle (handle);
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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/* make sure the schedule is released with the handle on error */
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handle->schedule = schedule;
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if (rank != 0) {
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if (inplace && rank < p - 1) {
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/* if sendbuf == recvbuf do not clobber the send buffer until it has been combined
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* with the incoming data. */
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res = NBC_Sched_recv ((void *) (ext * count), true, count, datatype, rank-1, schedule, false);
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} else {
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res = NBC_Sched_recv (recvbuf, false, count, datatype, rank-1, schedule, false);
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}
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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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if (rank < p - 1) {
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/* we have to wait until we have the data */
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res = NBC_Sched_barrier(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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/* perform the reduce in my temporary buffer */
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/* this cannot be done until handle->tmpbuf is unused :-( so barrier after */
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if (inplace) {
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res = NBC_Sched_op (0, true, sendbuf, false, (void *)(ext * count), true, count,
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datatype, op, schedule, true);
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} else {
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res = NBC_Sched_op (0, true, sendbuf, false, recvbuf, false, count, datatype, op,
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schedule, true);
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}
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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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/* send reduced data onward */
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res = NBC_Sched_send (0, true, count, datatype, rank + 1, schedule, false);
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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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if (inplace) {
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/* copy the received data into the receive buffer */
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res = NBC_Sched_copy ((void *)(ext * count), true, count, datatype, recvbuf,
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false, count, datatype, schedule, false);
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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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}
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}
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} else if (p > 1) {
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res = NBC_Sched_send (sendbuf, false, count, datatype, 1, schedule, false);
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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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}
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res = NBC_Sched_commit(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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#ifdef NBC_CACHE_SCHEDULE
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/* save schedule to tree */
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args = (NBC_Scan_args *) malloc (sizeof (args));
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if (NULL != args) {
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args->sendbuf = sendbuf;
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args->recvbuf = recvbuf;
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args->count = count;
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args->datatype = datatype;
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args->op = op;
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args->schedule = schedule;
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res = hb_tree_insert ((hb_tree *) libnbc_module->NBC_Dict[NBC_EXSCAN], args, args, 0);
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if (0 == res) {
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OBJ_RETAIN(schedule);
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/* increase number of elements for A2A */
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if (++libnbc_module->NBC_Dict_size[NBC_EXSCAN] > NBC_SCHED_DICT_UPPER) {
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NBC_SchedCache_dictwipe ((hb_tree *) libnbc_module->NBC_Dict[NBC_EXSCAN],
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&libnbc_module->NBC_Dict_size[NBC_EXSCAN]);
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}
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} else {
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NBC_Error("error in dict_insert() (%i)", res);
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free (args);
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}
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}
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} else {
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/* found schedule */
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schedule = found->schedule;
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OBJ_RETAIN(schedule);
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}
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#endif
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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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/* tmpbuf is freed with the handle */
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return OMPI_SUCCESS;
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}
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