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/*
* Copyright (c) 2018-2020 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2020 Bull S.A.S. All rights reserved.
*
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/**
* @file
*
* Warning: this is not for the faint of heart -- don't even bother
* reading this source code if you don't have a strong understanding
* of nested data structures and pointer math (remember that
* associativity and order of C operations is *critical* in terms of
* pointer math!).
*/
#include "ompi_config.h"
#include "mpi.h"
#include "coll_han.h"
#include "coll_han_dynamic.h"
#define HAN_SUBCOM_SAVE_COLLECTIVE(FALLBACKS, COMM, HANM, COLL) \
do { \
(FALLBACKS).COLL.module_fn.COLL = (COMM)->c_coll->coll_ ## COLL; \
(FALLBACKS).COLL.module = (COMM)->c_coll->coll_ ## COLL ## _module; \
(COMM)->c_coll->coll_ ## COLL = (HANM)->fallback.COLL.module_fn.COLL; \
(COMM)->c_coll->coll_ ## COLL ## _module = (HANM)->fallback.COLL.module; \
} while(0)
#define HAN_SUBCOM_LOAD_COLLECTIVE(FALLBACKS, COMM, HANM, COLL) \
do { \
(COMM)->c_coll->coll_ ## COLL = (FALLBACKS).COLL.module_fn.COLL; \
(COMM)->c_coll->coll_ ## COLL ## _module = (FALLBACKS).COLL.module; \
} while(0)
/*
* Routine that creates the local hierarchical sub-communicators
* Called each time a collective is called.
* comm: input communicator of the collective
*/
int mca_coll_han_comm_create_new(struct ompi_communicator_t *comm,
mca_coll_han_module_t *han_module)
{
int low_rank, low_size, up_rank, w_rank, w_size;
ompi_communicator_t **low_comm = &(han_module->sub_comm[INTRA_NODE]);
ompi_communicator_t **up_comm = &(han_module->sub_comm[INTER_NODE]);
mca_coll_han_collectives_fallback_t fallbacks;
int rc = OMPI_SUCCESS, vrank, *vranks;
opal_info_t comm_info;
/* The sub communicators have already been created */
if (han_module->enabled && NULL != han_module->sub_comm[INTRA_NODE]
&& NULL != han_module->sub_comm[INTER_NODE]
&& NULL != han_module->cached_vranks) {
return OMPI_SUCCESS;
}
/*
* We cannot use han allreduce and allgather without sub-communicators,
* but we are in the creation of the data structures for the HAN, and
* temporarily need to save back the old collective.
*
* Allgather is used to compute vranks
* Allreduce is used by ompi_comm_split_type in create_intranode_comm_new
* Reduce + Bcast may be called by the allreduce implementation
* Gather + Bcast may be called by the allgather implementation
*/
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, allgatherv);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, allgather);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, allreduce);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, bcast);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, reduce);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, gather);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, scatter);
/**
* HAN is not yet optimized for a single process per node case, we should
* avoid selecting it for collective communication support in such cases.
* However, in order to decide if this is true, we need to know how many
* local processes are on each node, a condition that cannot be verified
* outside the MPI support (with PRRTE the info will be eventually available,
* but we don't want to delay anything until then). We can achieve the same
* goal by using a reduction over the maximum number of peers per node among
* all participants.
*/
int local_procs = ompi_group_count_local_peers(comm->c_local_group);
rc = comm->c_coll->coll_allreduce(MPI_IN_PLACE, &local_procs, 1, MPI_INT,
MPI_MAX, comm,
comm->c_coll->coll_allreduce_module);
if( OMPI_SUCCESS != rc ) {
goto return_with_error;
}
if( local_procs == 1 ) {
/* restore saved collectives */
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgatherv);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allreduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, bcast);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, reduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, gather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, scatter);
han_module->enabled = false; /* entire module set to pass-through from now on */
return OMPI_ERR_NOT_SUPPORTED;
}
OBJ_CONSTRUCT(&comm_info, opal_info_t);
/* Create topological sub-communicators */
w_rank = ompi_comm_rank(comm);
w_size = ompi_comm_size(comm);
/*
* This sub-communicator contains the ranks that share my node.
*/
opal_info_set(&comm_info, "ompi_comm_coll_preference", "han");
opal_info_set(&comm_info, "ompi_comm_coll_han_topo_level", "INTRA_NODE");
rc = ompi_comm_split_type(comm, MPI_COMM_TYPE_SHARED, 0,
&comm_info, low_comm);
if( OMPI_SUCCESS != rc ) {
/* cannot create subcommunicators. Return the error upstream */
goto return_with_error;
}
/*
* Get my local rank and the local size
*/
low_size = ompi_comm_size(*low_comm);
low_rank = ompi_comm_rank(*low_comm);
/*
* This sub-communicator contains one process per node: processes with the
* same intra-node rank id share such a sub-communicator
*/
opal_info_set(&comm_info, "ompi_comm_coll_han_topo_level", "INTER_NODE");
rc = ompi_comm_split_with_info(comm, low_rank, w_rank, &comm_info, up_comm, false);
if( OMPI_SUCCESS != rc ) {
/* cannot create subcommunicators. Return the error upstream */
goto return_with_error;
}
up_rank = ompi_comm_rank(*up_comm);
/*
* Set my virtual rank number.
* my rank # = <intra-node comm size> * <inter-node rank number>
* + <intra-node rank number>
* WARNING: this formula works only if the ranks are perfectly spread over
* the nodes
* TODO: find a better way of doing
*/
vrank = low_size * up_rank + low_rank;
vranks = (int *)malloc(sizeof(int) * w_size);
/*
* gather vrank from each process so every process will know other processes
* vrank
*/
rc = comm->c_coll->coll_allgather(&vrank, 1, MPI_INT,
vranks, 1, MPI_INT,
comm, comm->c_coll->coll_allgather_module);
if( OMPI_SUCCESS != rc ) {
/* cannot create subcommunicators. Return the error upstream */
goto return_with_error;
}
/*
* Set the cached info
*/
han_module->cached_vranks = vranks;
/* Reset the saved collectives to point back to HAN */
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgatherv);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allreduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, bcast);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, reduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, gather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, scatter);
OBJ_DESTRUCT(&comm_info);
return OMPI_SUCCESS;
return_with_error:
if( NULL != *low_comm ) {
ompi_comm_free(low_comm);
*low_comm = NULL; /* don't leave the MPI_COMM_NULL set by ompi_comm_free */
}
if( NULL != *up_comm ) {
ompi_comm_free(up_comm);
*up_comm = NULL; /* don't leave the MPI_COMM_NULL set by ompi_comm_free */
}
return rc;
}
/*
* Routine that creates the local hierarchical sub-communicators
* Called each time a collective is called.
* comm: input communicator of the collective
*/
int mca_coll_han_comm_create(struct ompi_communicator_t *comm,
mca_coll_han_module_t *han_module)
{
int low_rank, low_size, up_rank, w_rank, w_size;
mca_coll_han_collectives_fallback_t fallbacks;
ompi_communicator_t **low_comms;
ompi_communicator_t **up_comms;
int vrank, *vranks;
opal_info_t comm_info;
/* use cached communicators if possible */
if (han_module->enabled && han_module->cached_low_comms != NULL &&
han_module->cached_up_comms != NULL &&
han_module->cached_vranks != NULL) {
return OMPI_SUCCESS;
}
/*
* We cannot use han allreduce and allgather without sub-communicators,
* but we are in the creation of the data structures for the HAN, and
* temporarily need to save back the old collective.
*
* Allgather is used to compute vranks
* Allreduce is used by ompi_comm_split_type in create_intranode_comm_new
* Reduce + Bcast may be called by the allreduce implementation
* Gather + Bcast may be called by the allgather implementation
*/
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, allgatherv);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, allgather);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, allreduce);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, bcast);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, reduce);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, gather);
HAN_SUBCOM_SAVE_COLLECTIVE(fallbacks, comm, han_module, scatter);
/**
* HAN is not yet optimized for a single process per node case, we should
* avoid selecting it for collective communication support in such cases.
* However, in order to decide if this is tru, we need to know how many
* local processes are on each node, a condition that cannot be verified
* outside the MPI support (with PRRTE the info will be eventually available,
* but we don't want to delay anything until then). We can achieve the same
* goal by using a reduction over the maximum number of peers per node among
* all participants.
*/
int local_procs = ompi_group_count_local_peers(comm->c_local_group);
comm->c_coll->coll_allreduce(MPI_IN_PLACE, &local_procs, 1, MPI_INT,
MPI_MAX, comm,
comm->c_coll->coll_allreduce_module);
if( local_procs == 1 ) {
/* restore saved collectives */
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgatherv);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allreduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, bcast);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, reduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, gather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, scatter);
han_module->enabled = false; /* entire module set to pass-through from now on */
return OMPI_ERR_NOT_SUPPORTED;
}
/* create communicators if there is no cached communicator */
w_rank = ompi_comm_rank(comm);
w_size = ompi_comm_size(comm);
low_comms = (struct ompi_communicator_t **)malloc(COLL_HAN_LOW_MODULES *
sizeof(struct ompi_communicator_t *));
up_comms = (struct ompi_communicator_t **)malloc(COLL_HAN_UP_MODULES *
sizeof(struct ompi_communicator_t *));
OBJ_CONSTRUCT(&comm_info, opal_info_t);
/*
* Upgrade sm module priority to set up low_comms[0] with sm module
* This sub-communicator contains the ranks that share my node.
*/
opal_info_set(&comm_info, "ompi_comm_coll_preference", "tuned,^han");
ompi_comm_split_type(comm, MPI_COMM_TYPE_SHARED, 0,
&comm_info, &(low_comms[0]));
/*
* Get my local rank and the local size
*/
low_size = ompi_comm_size(low_comms[0]);
low_rank = ompi_comm_rank(low_comms[0]);
/*
* Upgrade shared module priority to set up low_comms[1] with shared module
* This sub-communicator contains the ranks that share my node.
*/
opal_info_set(&comm_info, "ompi_comm_coll_preference", "sm,^han");
ompi_comm_split_type(comm, MPI_COMM_TYPE_SHARED, 0,
&comm_info, &(low_comms[1]));
/*
* Upgrade libnbc module priority to set up up_comms[0] with libnbc module
* This sub-communicator contains one process per node: processes with the
* same intra-node rank id share such a sub-communicator
*/
opal_info_set(&comm_info, "ompi_comm_coll_preference", "libnbc,^han");
ompi_comm_split_with_info(comm, low_rank, w_rank, &comm_info, &(up_comms[0]), false);
up_rank = ompi_comm_rank(up_comms[0]);
/*
* Upgrade adapt module priority to set up up_comms[0] with adapt module
* This sub-communicator contains one process per node.
*/
opal_info_set(&comm_info, "ompi_comm_coll_preference", "adapt,^han");
ompi_comm_split_with_info(comm, low_rank, w_rank, &comm_info, &(up_comms[1]), false);
/*
* Set my virtual rank number.
* my rank # = <intra-node comm size> * <inter-node rank number>
* + <intra-node rank number>
* WARNING: this formula works only if the ranks are perfectly spread over
* the nodes
* TODO: find a better way of doing
*/
vrank = low_size * up_rank + low_rank;
vranks = (int *)malloc(sizeof(int) * w_size);
/*
* gather vrank from each process so every process will know other processes
* vrank
*/
comm->c_coll->coll_allgather(&vrank, 1, MPI_INT, vranks, 1, MPI_INT, comm,
comm->c_coll->coll_allgather_module);
/*
* Set the cached info
*/
han_module->cached_low_comms = low_comms;
han_module->cached_up_comms = up_comms;
han_module->cached_vranks = vranks;
/* Reset the saved collectives to point back to HAN */
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgatherv);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allgather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, allreduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, bcast);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, reduce);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, gather);
HAN_SUBCOM_LOAD_COLLECTIVE(fallbacks, comm, han_module, scatter);
OBJ_DESTRUCT(&comm_info);
return OMPI_SUCCESS;
}
|
