251 строка
8.7 KiB
C
251 строка
8.7 KiB
C
/*
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* Copyright (c) 2013 Mellanox Technologies, Inc.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "oshmem_config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "orte/mca/grpcomm/grpcomm.h"
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#include "opal/util/bit_ops.h"
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#include "oshmem/constants.h"
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#include "oshmem/mca/spml/spml.h"
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#include "oshmem/mca/scoll/scoll.h"
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#include "oshmem/mca/scoll/base/base.h"
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#include "scoll_basic.h"
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static int _algorithm_central_counter(struct oshmem_group_t *group,
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int PE_root,
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void *target,
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const void *source,
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size_t nlong,
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long *pSync);
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static int _algorithm_binomial_tree(struct oshmem_group_t *group,
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int PE_root,
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void *target,
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const void *source,
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size_t nlong,
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long *pSync);
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int mca_scoll_basic_broadcast(struct oshmem_group_t *group,
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int PE_root,
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void *target,
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const void *source,
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size_t nlong,
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long *pSync,
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int alg)
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{
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int rc = OSHMEM_SUCCESS;
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/* Arguments validation */
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if (!group) {
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SCOLL_ERROR("Active set (group) of PE is not defined");
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rc = OSHMEM_ERR_BAD_PARAM;
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}
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/* Check if this PE is part of the group */
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if ((rc == OSHMEM_SUCCESS) && oshmem_proc_group_is_member(group)) {
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int i = 0;
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if (pSync) {
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alg = (alg == SCOLL_DEFAULT_ALG ?
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mca_scoll_basic_param_broadcast_algorithm : alg);
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switch (alg) {
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case SCOLL_ALG_BROADCAST_CENTRAL_COUNTER:
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{
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rc = _algorithm_central_counter(group,
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PE_root,
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target,
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source,
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nlong,
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pSync);
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break;
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}
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case SCOLL_ALG_BROADCAST_BINOMIAL:
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{
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rc = _algorithm_binomial_tree(group,
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PE_root,
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target,
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source,
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nlong,
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pSync);
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break;
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}
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default:
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{
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rc = _algorithm_binomial_tree(group,
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PE_root,
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target,
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source,
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nlong,
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pSync);
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}
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}
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} else {
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SCOLL_ERROR("Incorrect argument pSync");
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rc = OSHMEM_ERR_BAD_PARAM;
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}
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/* Restore initial values */
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SCOLL_VERBOSE(12,
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"[#%d] Restore special synchronization array",
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group->my_pe);
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for (i = 0; pSync && (i < _SHMEM_BCAST_SYNC_SIZE); i++) {
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pSync[i] = _SHMEM_SYNC_VALUE;
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}
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}
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return rc;
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}
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/*
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This algorithm is quite simple and straightforward. But because of it<69>s obvious simplicity and
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the naive prove for correctness it is implemented quite often. The root send data to all.
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Outlay:
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NP-1 competing network transfers are needed to implement the counter
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The memory usage is constant (1 byte) per node.
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*/
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static int _algorithm_central_counter(struct oshmem_group_t *group,
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int PE_root,
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void *target,
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const void *source,
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size_t nlong,
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long *pSync)
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{
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int rc = OSHMEM_SUCCESS;
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int i = 0;
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SCOLL_VERBOSE(12,
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"[#%d] Broadcast algorithm: Central Counter",
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group->my_pe);
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SCOLL_VERBOSE(15,
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"[#%d] pSync[0] = %ld root = #%d",
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group->my_pe, pSync[0], PE_root);
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/* Check if this PE is the root */
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if (PE_root == group->my_pe) {
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int pe_cur = 0;
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SCOLL_VERBOSE(14,
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"[#%d] send data to all PE in the group",
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group->my_pe);
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for (i = 0; (i < group->proc_count) && (rc == OSHMEM_SUCCESS); i++) {
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pe_cur = oshmem_proc_pe(group->proc_array[i]);
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if (pe_cur != PE_root) {
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SCOLL_VERBOSE(15,
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"[#%d] send data to #%d",
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group->my_pe, pe_cur);
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rc = MCA_SPML_CALL(put(target, nlong, (void *)source, pe_cur));
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}
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}
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}
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/* Wait for operation completion to set needed size */
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if (rc == OSHMEM_SUCCESS) {
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SCOLL_VERBOSE(14, "[#%d] Wait for operation completion", group->my_pe);
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rc = BARRIER_FUNC(group,
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(pSync + 1),
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SCOLL_DEFAULT_ALG);
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}
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return rc;
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}
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/*
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The Binomial Spanning Tree algorithm.
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Outlay:
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The game scales with log2(NP) and uses 1 byte of memory.
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*/
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static int _algorithm_binomial_tree(struct oshmem_group_t *group,
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int PE_root,
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void *target,
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const void *source,
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size_t nlong,
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long *pSync)
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{
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int rc = OSHMEM_SUCCESS;
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long value = SHMEM_SYNC_INIT;
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int root_id = oshmem_proc_group_find_id(group, PE_root);
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int my_id = oshmem_proc_group_find_id(group, group->my_pe);
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int peer_id = 0;
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int peer_pe = 0;
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int vrank;
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int dim = opal_cube_dim(group->proc_count);
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int hibit;
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int mask;
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int i = 0;
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SCOLL_VERBOSE(12, "[#%d] Broadcast algorithm: Tree", group->my_pe);
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SCOLL_VERBOSE(15,
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"[#%d] pSync[0] = %ld root = #%d",
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group->my_pe, pSync[0], PE_root);
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vrank = (my_id + group->proc_count - root_id) % group->proc_count;
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hibit = opal_hibit(vrank, dim);
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SCOLL_VERBOSE(15,
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"[#%d] dim = %d vrank = %d hibit = %d",
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group->my_pe, dim, vrank, hibit);
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dim--;
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pSync[0] = SHMEM_SYNC_READY;
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/* Receive data from parent in the tree. */
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if (vrank > 0) {
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value = SHMEM_SYNC_READY;
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SCOLL_VERBOSE(14, "[#%d] wait", group->my_pe);
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rc = MCA_SPML_CALL(wait((void*)pSync, SHMEM_CMP_NE, (void*)&value, SHMEM_LONG));
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while ((value = pSync[0]) < 0) {
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SCOLL_VERBOSE(14,
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"[#%d] Broadcast size is a negative value (%li)\n",
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group->my_pe, pSync[0]);
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MCA_SPML_CALL(wait((void*)pSync, SHMEM_CMP_NE, (void*)&value, SHMEM_LONG));
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}
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if (OSHMEM_SUCCESS != rc) {
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return rc;
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}
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nlong = (size_t) pSync[0];
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}
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/* Send data to the children. */
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for (i = hibit + 1, mask = 1 << i; i <= dim; ++i, mask <<= 1) {
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peer_id = vrank | mask;
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if (peer_id < group->proc_count) {
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/* Wait for the child to be ready to receive (pSync must have the initial value) */
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peer_id = (peer_id + root_id) % group->proc_count;
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peer_pe = oshmem_proc_pe(group->proc_array[peer_id]);
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SCOLL_VERBOSE(14,
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"[#%d] check remote pe is ready to receive #%d",
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group->my_pe, peer_pe);
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do {
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rc = MCA_SPML_CALL(get((void*)pSync, sizeof(long), (void*)pSync, peer_pe));
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} while ((OSHMEM_SUCCESS == rc) && (pSync[0] != SHMEM_SYNC_READY));
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SCOLL_VERBOSE(14, "[#%d] send data to #%d", group->my_pe, peer_pe);
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rc = MCA_SPML_CALL(put(target, nlong, (my_id == root_id ? (void *)source : target), peer_pe));
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MCA_SPML_CALL(fence());
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SCOLL_VERBOSE(14, "[#%d] signals to #%d", group->my_pe, peer_pe);
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value = nlong;
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rc = MCA_SPML_CALL(put((void*)pSync, sizeof(value), (void*)&value, peer_pe));
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if (OSHMEM_SUCCESS != rc) {
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break;
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}
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}
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}
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return rc;
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}
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