236 строки
7.1 KiB
C
236 строки
7.1 KiB
C
/*
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* Copyright (c) 2007-2008 UT-Battelle, LLC
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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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/** @file */
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#include "ompi_config.h"
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#include "ompi/constants.h"
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#include "coll_sm2.h"
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#include "ompi/op/op.h"
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#include "ompi/datatype/datatype.h"
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#include "ompi/communicator/communicator.h"
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/* debug
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#include "opal/sys/timer.h"
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extern uint64_t timers[7];
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end debug */
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/**
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* Shared memory blocking allreduce.
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*/
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static
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int mca_coll_sm2_fanout(void *buf, int count,
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struct ompi_datatype_t *dtype, int root,
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struct ompi_communicator_t *comm,
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struct mca_coll_base_module_1_1_0_t *module)
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{
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/* local variables */
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int rc=OMPI_SUCCESS,n_dts_per_buffer,n_data_segments,stripe_number;
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int comm_size,process_shift,my_node_index;
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int my_rank;
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int count_processed,count_this_stripe;
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int my_fanout_parent;
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size_t message_extent,dt_extent,ctl_size,len_data_buffer;
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long long tag;
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volatile char * my_data_pointer;
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volatile char * parent_data_pointer;
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mca_coll_sm2_nb_request_process_shared_mem_t *my_ctl_pointer;
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volatile mca_coll_sm2_nb_request_process_shared_mem_t * parent_ctl_pointer;
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mca_coll_sm2_module_t *sm_module;
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tree_node_t *my_fanout_read_tree;
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sm_work_buffer_t *sm_buffer_desc;
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sm_module=(mca_coll_sm2_module_t *) module;
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/* compute process shift */
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my_rank=ompi_comm_rank(comm);
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comm_size=ompi_comm_size(comm);
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process_shift=root;
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my_node_index=my_rank-root;
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/* wrap around */
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if(0 > my_node_index ) {
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my_node_index+=comm_size;
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}
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/* get size of data needed - same layout as user data, so that
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* we can apply the reudction routines directly on these buffers
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*/
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rc=ompi_ddt_type_extent(dtype, &dt_extent);
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if( OMPI_SUCCESS != rc ) {
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goto Error;
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}
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message_extent=dt_extent*count;
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/* lenght of control and data regions */
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ctl_size=sm_module->ctl_memory_per_proc_per_segment;
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len_data_buffer=sm_module->data_memory_per_proc_per_segment;
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/* number of data types copies that the scratch buffer can hold */
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n_dts_per_buffer=((int) len_data_buffer)/dt_extent;
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if ( 0 == n_dts_per_buffer ) {
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rc=OMPI_ERROR;
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goto Error;
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}
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/* compute number of stripes needed to process this collective */
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n_data_segments=(count+n_dts_per_buffer -1 ) / n_dts_per_buffer ;
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/* get my node for the reduction tree */
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my_fanout_read_tree=&(sm_module->fanout_read_tree[my_node_index]);
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my_fanout_parent=my_fanout_read_tree->parent_rank+process_shift;
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if( comm_size <= my_fanout_parent ){
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my_fanout_parent-=comm_size;
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}
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count_processed=0;
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/* get a pointer to the shared-memory working buffer */
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/* NOTE: starting with a rather synchronous approach */
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for( stripe_number=0 ; stripe_number < n_data_segments ; stripe_number++ ) {
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/* get unique tag for this stripe - assume only one collective
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* per communicator at a given time, so no locking needed
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* for atomic update of the tag */
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tag=sm_module->collective_tag;
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sm_module->collective_tag++;
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sm_buffer_desc=alloc_sm2_shared_buffer(sm_module);
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/* get number of elements to process in this stripe */
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count_this_stripe=n_dts_per_buffer;
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if( count_processed + count_this_stripe > count )
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count_this_stripe=count-count_processed;
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/* offset to data segment */
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my_ctl_pointer=sm_buffer_desc->proc_memory[my_rank].control_region;
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my_data_pointer=sm_buffer_desc->proc_memory[my_rank].data_segment;
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/*
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* Fan out from root - let the memory copies at each
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* stage help reduce memory contention.
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*/
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if( ROOT_NODE == my_fanout_read_tree->my_node_type ) {
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/* copy data to user supplied buffer */
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rc=ompi_ddt_copy_content_same_ddt(dtype, count_this_stripe,
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(char *)my_data_pointer,
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(char *)((char *)buf+dt_extent*count_processed));
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if( 0 != rc ) {
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return OMPI_ERROR;
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}
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/* I am the root - so copy signal children, and then
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* start reading
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*/
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MB();
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my_ctl_pointer->flag=tag;
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} else if( LEAF_NODE == my_fanout_read_tree->my_node_type ) {
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parent_data_pointer=
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sm_buffer_desc->proc_memory[my_fanout_parent].data_segment;
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parent_ctl_pointer=
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sm_buffer_desc->proc_memory[my_fanout_parent].control_region;
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/*
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* wait on Parent to signal that data is ready
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*/
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while( parent_ctl_pointer->flag != tag) {
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opal_progress();
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}
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/* copy data to user supplied buffer */
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rc=ompi_ddt_copy_content_same_ddt(dtype, count_this_stripe,
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(char *)buf+dt_extent*count_processed,
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(char *)parent_data_pointer);
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if( 0 != rc ) {
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return OMPI_ERROR;
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}
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} else {
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/* interior nodes */
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parent_data_pointer=
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sm_buffer_desc->proc_memory[my_fanout_parent].data_segment;
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parent_ctl_pointer=
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sm_buffer_desc->proc_memory[my_fanout_parent].control_region;
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/*
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* wait on Parent to signal that data is ready
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*/
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while( parent_ctl_pointer->flag != tag) {
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opal_progress();
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}
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/* copy the data to my shared buffer, for access by children */
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rc=ompi_ddt_copy_content_same_ddt(dtype, count_this_stripe,
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(char *)my_data_pointer,(char *)parent_data_pointer);
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if( 0 != rc ) {
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return OMPI_ERROR;
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}
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/* set memory barriet to make sure data is in main memory before
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* the completion flgas are set.
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*/
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MB();
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/* signal children that they may read the result data */
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my_ctl_pointer->flag=tag;
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/* copy data to user supplied buffer */
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rc=ompi_ddt_copy_content_same_ddt(dtype, count_this_stripe,
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(char *)buf+dt_extent*count_processed,
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(char *)my_data_pointer);
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if( 0 != rc ) {
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return OMPI_ERROR;
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}
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}
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/* "free" the shared-memory working buffer */
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rc=free_sm2_shared_buffer(sm_module);
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if( OMPI_SUCCESS != rc ) {
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goto Error;
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}
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/* update the count of elements processed */
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count_processed+=count_this_stripe;
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}
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/* return */
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return rc;
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Error:
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return rc;
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}
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/**
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* Shared memory blocking broadcast.
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*/
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int mca_coll_sm2_bcast_intra(void *buf, int count,
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struct ompi_datatype_t *dtype, int root,
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struct ompi_communicator_t *comm,
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struct mca_coll_base_module_1_1_0_t *module)
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{
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/* local variables */
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int rc;
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rc= mca_coll_sm2_fanout(buf, count, dtype, root, comm, module);
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if( OMPI_SUCCESS != rc ) {
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goto Error;
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}
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return OMPI_SUCCESS;
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Error:
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return rc;
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}
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