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/*
* Copyright (c) 2013-2021 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
*
*
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal/mca/base/mca_base_var.h"
#include "ompi/runtime/params.h"
#include "ompi/group/group.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/bml/bml.h"
#include "ompi/mca/bml/base/base.h"
#include "ompi/mca/coll/base/base.h"
#include "ompi/mca/coll/base/coll_tags.h"
static int ompi_comm_rbcast_null(ompi_communicator_t* comm, ompi_comm_rbcast_message_t* msg, size_t size) { return OMPI_SUCCESS; }
static int ompi_comm_rbcast_bmg(ompi_communicator_t* comm, ompi_comm_rbcast_message_t* msg, size_t size);
static int ompi_comm_rbcast_n2(ompi_communicator_t* comm, ompi_comm_rbcast_message_t* msg, size_t size);
int (*ompi_comm_rbcast) (ompi_communicator_t* comm, ompi_comm_rbcast_message_t* msg, size_t size) = ompi_comm_rbcast_null;
static int (*ompi_comm_rbcast_fw) (ompi_communicator_t* comm, ompi_comm_rbcast_message_t* msg, size_t size) = ompi_comm_rbcast_null;
static void ompi_rbcast_bml_send_complete_cb(
struct mca_btl_base_module_t* module,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* descriptor,
int status);
static void ompi_comm_rbcast_bml_recv_cb(
struct mca_btl_base_module_t* btl,
const mca_btl_base_receive_descriptor_t* descriptor);
/* Broadcast a rbcast token to the appropriate neighbors in a BMG */
static int ompi_comm_rbcast_bmg(ompi_communicator_t* comm, ompi_comm_rbcast_message_t* msg, size_t size) {
int me, np, ret = OMPI_SUCCESS;
int i,d;
ompi_group_t* lgrp, * hgrp = NULL;
OPAL_OUTPUT_VERBOSE((5, ompi_ftmpi_output_handle,
"%s %s: rbcast on communicator %3d:%d",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, msg->cid, msg->epoch ));
if( OMPI_COMM_IS_INTER(comm) ) {
int first = ompi_comm_determine_first_auto(comm);
np = ompi_comm_size(comm) + ompi_comm_remote_size(comm);
lgrp = first? comm->c_local_group: comm->c_remote_group;
hgrp = first? comm->c_remote_group: comm->c_local_group;
me = first? ompi_comm_rank(comm): ompi_comm_rank(comm)+ompi_comm_remote_size(comm);
}
else {
np = ompi_comm_size(comm);
lgrp = comm->c_local_group;
me = ompi_comm_rank(comm);
}
/* d is the direction, forward (1*2^i), then backward (-1*2^i) */
for(i = 1; i <= np/2; i *= 2) for(d = 1; d >= -1; d -= 2) {
ompi_proc_t* proc;
int idx = (np+me+d*i)%np;
redo:
if( idx == me ) continue;
if(OPAL_LIKELY( idx < ompi_group_size(lgrp) )) {
proc = ompi_group_peer_lookup(lgrp, idx);
}
else {
assert(NULL != hgrp); assert(OMPI_COMM_IS_INTER(comm));
proc = ompi_group_peer_lookup(hgrp, idx-ompi_group_size(lgrp));
}
if( ompi_proc_is_active(proc) ) {
ret = ompi_comm_rbcast_send_msg(proc, msg, size);
if(OPAL_LIKELY( OMPI_SUCCESS == ret )) {
continue;
}
if(OPAL_UNLIKELY( OMPI_ERR_UNREACH != ret )) {
return ret;
}
}
if( i == 1 ) {
/* The ring is cut, find the closest alive neighbor in that
* direction */
idx = (np+idx+d)%np;
/* TODO: find a way to not send twice the message if idx is one of
* my neighbors for i>1 */
goto redo;
}
}
return OMPI_SUCCESS;
}
/* Broadcast a rbcast token to everybody (n^2 comms) */
static int ompi_comm_rbcast_n2(ompi_communicator_t* comm, ompi_comm_rbcast_message_t* msg, size_t size) {
int i, ret;
ompi_group_t* grp;
OPAL_OUTPUT_VERBOSE((5, ompi_ftmpi_output_handle,
"%s %s: rbcast on communicator %3d:%d",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, msg->cid, msg->epoch ));
/* send a message to all procs in local_group, then all procs in
* remote_group (if distinct) */
for(grp = comm->c_local_group;
grp != NULL;
grp = (grp != comm->c_remote_group)? comm->c_remote_group: NULL)
for(i = 0; i < ompi_group_size(grp); i++) {
ompi_proc_t* proc;
proc = ompi_group_peer_lookup(grp, i);
if( ompi_proc_local_proc == proc ) continue;
ret = ompi_comm_rbcast_send_msg(proc, msg, size);
if(OPAL_UNLIKELY( OMPI_SUCCESS != ret )) {
if(OPAL_UNLIKELY( OMPI_ERR_UNREACH != ret )) {
return ret;
}
}
}
return OMPI_SUCCESS;
}
/*
* registration of callbacks
*/
#define RBCAST_CB_TYPE_MAX 7
static ompi_comm_rbcast_cb_t ompi_comm_rbcast_cb[RBCAST_CB_TYPE_MAX+1];
int ompi_comm_rbcast_register_cb_type(ompi_comm_rbcast_cb_t callback) {
int i;
for(i = 0; i < RBCAST_CB_TYPE_MAX; i++) {
if( NULL == ompi_comm_rbcast_cb[i] ) {
ompi_comm_rbcast_cb[i] = callback;
return i;
}
}
return OMPI_ERR_OUT_OF_RESOURCE;
}
int ompi_comm_rbcast_unregister_cb_type(int type) {
if( RBCAST_CB_TYPE_MAX < type || 0 > type ) {
return OMPI_ERR_BAD_PARAM;
}
ompi_comm_rbcast_cb[type] = NULL;
return OMPI_SUCCESS;
}
/*
* BML HELPERS
*/
static void ompi_comm_rbcast_bml_recv_cb(
struct mca_btl_base_module_t* btl,
const mca_btl_base_receive_descriptor_t* descriptor)
{
ompi_comm_rbcast_message_t* msg;
ompi_communicator_t* comm;
/* Parse the rbcast fragment */
assert( MCA_BTL_TAG_FT_RBCAST == descriptor->tag );
assert( 1 == descriptor->des_segment_count );
assert( sizeof(ompi_comm_rbcast_message_t) <= descriptor->des_segments->seg_len );
msg = (ompi_comm_rbcast_message_t*) descriptor->des_segments->seg_addr.pval;
OPAL_OUTPUT_VERBOSE((10, ompi_ftmpi_output_handle,
"%s %s: Info: Received rbcast tag for communicator with CID %3d:%d",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, msg->cid, msg->epoch));
/* Find the target comm */
comm = (ompi_communicator_t *)ompi_comm_lookup(msg->cid);
if(OPAL_UNLIKELY( NULL == comm )) {
OPAL_OUTPUT_VERBOSE((2, ompi_ftmpi_output_handle,
"%s %s: Info: Could not find the communicator with CID %3d:%d",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, msg->cid, msg->epoch));
return;
}
if(OPAL_UNLIKELY( msg->cid != ompi_comm_get_local_cid(comm))) {
OPAL_OUTPUT_VERBOSE((2, ompi_ftmpi_output_handle,
"%s %s: Info: received a late rbcast message with CID %3d:%d during an MPI_COMM_DUP that is trying to reuse that CID (thus increasing the epoch) - ignoring, nothing to do",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, msg->cid, msg->epoch));
return;
}
/* Check if this is a delayed rbcast for an old communicator whose CID has been reused */
if(OPAL_UNLIKELY( comm->c_epoch != msg->epoch )) {
OPAL_OUTPUT_VERBOSE((2, ompi_ftmpi_output_handle,
"%s %s: Info: Received a late rbcast order for the communicator with CID %3d:%d when it is now at epoch %d - ignoring, nothing to do",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, msg->cid, msg->epoch, comm->c_epoch));
return;
}
/* invoke the local registered callback for the type */
assert( RBCAST_CB_TYPE_MAX >= msg->type );
if( NULL != ompi_comm_rbcast_cb[msg->type] ) {
if( ompi_comm_rbcast_cb[msg->type](comm, msg) ) {
/* forward the rbcast */
ompi_comm_rbcast_fw(comm, msg, descriptor->des_segments->seg_len);
}
}
else {
/* During finalize, we loosely synchronize so it may happen
* that we keep receiving messages after we deregistered the type.
* Any other time, this is indicative of a problem.
*/
assert(ompi_mpi_state >= OMPI_MPI_STATE_FINALIZE_STARTED);
}
}
int ompi_comm_rbcast_send_msg(ompi_proc_t* proc, ompi_comm_rbcast_message_t* msg, size_t size) {
mca_bml_base_endpoint_t* endpoint = mca_bml_base_get_endpoint(proc);
assert( NULL != endpoint );
mca_bml_base_btl_t *bml_btl = mca_bml_base_btl_array_get_index(&endpoint->btl_eager, 0);
assert( NULL != bml_btl );
mca_btl_base_descriptor_t *des;
int ret;
if(!ompi_proc_is_active(proc)) {
opal_output_verbose(5, ompi_ftmpi_output_handle,
"%s %s: %s is dead, dropping rbcast for comm %3d:%d",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, OMPI_NAME_PRINT(&proc->super.proc_name), msg->cid, msg->epoch);
return OMPI_ERR_UNREACH;
}
OPAL_OUTPUT_VERBOSE((5, ompi_ftmpi_output_handle,
"%s %s: preparing a fragment to %s to rbcast %3d:%d",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, OMPI_NAME_PRINT(&proc->super.proc_name), msg->cid, msg->epoch));
mca_bml_base_alloc(bml_btl, &des, MCA_BTL_NO_ORDER,
size,
MCA_BTL_DES_FLAGS_PRIORITY | MCA_BTL_DES_FLAGS_BTL_OWNERSHIP);
if(OPAL_UNLIKELY(NULL == des)) {
opal_output(ompi_ftmpi_output_handle,
"%s %s: Error: bml_base_alloc failed.",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__);
return OMPI_ERR_OUT_OF_RESOURCE;
}
assert( des->des_segments->seg_len == size ) ;
des->des_cbfunc = ompi_rbcast_bml_send_complete_cb;
memcpy(des->des_segments->seg_addr.pval, msg, size);
ret = mca_bml_base_send(bml_btl, des, MCA_BTL_TAG_FT_RBCAST);
if(OPAL_LIKELY( ret >= 0 )) {
if(OPAL_LIKELY( 1 == ret )) {
OPAL_OUTPUT_VERBOSE((5, ompi_ftmpi_output_handle,
"%s %s: fragment to %s to rbcast %3d:%d is on the wire",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, OMPI_NAME_PRINT(&proc->super.proc_name), msg->cid, msg->epoch));
}
}
else {
mca_bml_base_free(bml_btl, des);
OPAL_OUTPUT_VERBOSE((2, ompi_ftmpi_output_handle,
"%s %s: could not send a fragment to %s to rbcast %3d (status %d)",
OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, OMPI_NAME_PRINT(&proc->super.proc_name), msg->cid, ret));
return ret;
}
return OMPI_SUCCESS;
}
static void ompi_rbcast_bml_send_complete_cb(
struct mca_btl_base_module_t* module,
struct mca_btl_base_endpoint_t* endpoint,
struct mca_btl_base_descriptor_t* descriptor,
int status)
{
if(OPAL_UNLIKELY( OMPI_SUCCESS != status )) {
opal_output_verbose(2, ompi_ftmpi_output_handle,
"%s %s: status %d", OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, status);
}
else {
OPAL_OUTPUT_VERBOSE((91, ompi_ftmpi_output_handle,
"%s %s: status %d", OMPI_NAME_PRINT(OMPI_PROC_MY_NAME), __func__, status));
}
return;
}
/*
* Init/Finalize
*/
static bool comm_rbcast_listener_started = false;
static int rbcast = 1;
int ompi_comm_rbcast_register_params(void) {
(void) mca_base_var_register ("ompi", "mpi", "ft", "reliable_bcast",
"Reliable Broadcast algorithm (1: Binomial Graph Diffusion; 2: N^2 full graph diffusion)",
MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
OPAL_INFO_LVL_9, MCA_BASE_VAR_SCOPE_READONLY, &rbcast);
return OMPI_SUCCESS;
}
int ompi_comm_rbcast_init(void) {
int ret;
switch( rbcast ) {
case 0:
return OMPI_SUCCESS;
case 1:
ompi_comm_rbcast = ompi_comm_rbcast_bmg;
ompi_comm_rbcast_fw = ompi_comm_rbcast_bmg;
break;
case 2:
ompi_comm_rbcast = ompi_comm_rbcast_n2;
ompi_comm_rbcast_fw = ompi_comm_rbcast_n2;
break;
default:
return OMPI_ERR_BAD_PARAM;
}
if( comm_rbcast_listener_started ) {
return OMPI_SUCCESS;
}
ret = mca_bml.bml_register(MCA_BTL_TAG_FT_RBCAST, ompi_comm_rbcast_bml_recv_cb, NULL);
if( OMPI_SUCCESS == ret ) {
comm_rbcast_listener_started = true;
}
return ret;
}
int ompi_comm_rbcast_finalize(void) {
return OMPI_SUCCESS;
}
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