3eac49aa59
This "feature" is disabled by default and it should not affect the current performance. In case when the message size is large and segment size is smaller than eager size for particular interface, the leaf nodes in generalized reduce function can overflood parent nodes by sending all segments without any synchronization. This can cause the parent to have HIGH number of unexpected messages (think 16MB message with 1KB segments for example). In case of binomial algorithm root node always has at least one child which is leaf, so this can potentially affect the root's performance significantly [Especially in large communicators where root may have quite a few children (binomial tree for example)]. When the segment size is bigger than the eager size, rendezvous protocol ensures that this does not happen so it is not necessary. Originally, the problem was exposed in "infinite" bucket allocator clean up time for "small" segment sizes (which may explain some "deadlocks" on Thunderbird tests). To prevent this, we allow user to specify mca parameter "--mca coll_tuned_reduce_algorithm_max_requests NUM" this limits number of outstanding messages from a leaf node in generalized reduce to the parent to NUM. Messages are sent as non-blocking synchrnous messages, so syncronization happens at "wait" time. The synchronization actually improved performance of pipeline and binomial algorithm for large message sizes with 1KB segments over MX, but I need to test it some more to make sure it is consistent. Since there is no easy way to find out what is "the eager" size for particular btl, I set the limit to 4000B. If message/individual segment size is greater than 4000B - we will not use this feature. This variable may or may not be exposed as mca parameter later... I did not have any problems running it and both "default" and "synchronous" tests passed Intel Reduce* tests up to 80 processes (over MX). This commit was SVN r14518.
404 строки
17 KiB
C
404 строки
17 KiB
C
/*
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* Copyright (c) 2004-2005 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) 2004-2006 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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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 "ompi_config.h"
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#include "mpi.h"
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#include "ompi/constants.h"
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#include "ompi/datatype/datatype.h"
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#include "ompi/communicator/communicator.h"
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#include "opal/mca/base/mca_base_param.h"
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#include "ompi/mca/coll/base/base.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "coll_tuned.h"
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#include "ompi/mca/pml/pml.h"
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#include "opal/util/bit_ops.h"
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#include "coll_tuned.h"
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/*
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* Notes on evaluation rules and ordering
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*
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* The order is:
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* use file based rules if presented (-coll_tuned_dynamic_rules_filename = rules)
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* Else
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* use forced rules (-coll_tuned_dynamic_ALG_intra_algorithm = algorithm-number)
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* Else
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* use fixed (compiled) rule set (or nested ifs)
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*
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*/
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/*
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* allreduce_intra
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*
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* Function: - allreduce using other MPI collectives
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* Accepts: - same as MPI_Allreduce()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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ompi_coll_tuned_allreduce_intra_dec_dynamic (void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream, "ompi_coll_tuned_allreduce_intra_dec_dynamic"));
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/* check to see if we have some filebased rules */
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if (comm->c_coll_selected_data->com_rules[ALLREDUCE]) {
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/* we do, so calc the message size or what ever we need and use this for the evaluation */
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int alg, faninout, segsize, ignoreme;
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size_t dsize;
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ompi_ddt_type_size (dtype, &dsize);
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dsize *= count;
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alg = ompi_coll_tuned_get_target_method_params (comm->c_coll_selected_data->com_rules[ALLREDUCE],
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dsize, &faninout, &segsize, &ignoreme);
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if (alg) { /* we have found a valid choice from the file based rules for this message size */
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return ompi_coll_tuned_allreduce_intra_do_this (sbuf, rbuf, count, dtype, op, comm,
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alg, faninout, segsize);
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} /* found a method */
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} /*end if any com rules to check */
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if (comm->c_coll_selected_data->user_forced[ALLREDUCE].algorithm) {
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return ompi_coll_tuned_allreduce_intra_do_forced (sbuf, rbuf, count, dtype, op, comm);
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}
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return ompi_coll_tuned_allreduce_intra_dec_fixed (sbuf, rbuf, count, dtype, op, comm);
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}
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/*
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* alltoall_intra_dec
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*
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* Function: - seletects alltoall algorithm to use
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* Accepts: - same arguments as MPI_Alltoall()
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* Returns: - MPI_SUCCESS or error code (passed from the bcast implementation)
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*/
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int ompi_coll_tuned_alltoall_intra_dec_dynamic(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void* rbuf, int rcount,
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struct ompi_datatype_t *rdtype,
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struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream, "ompi_coll_tuned_alltoall_intra_dec_dynamic"));
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/* check to see if we have some filebased rules */
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if (comm->c_coll_selected_data->com_rules[ALLTOALL]) {
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/* we do, so calc the message size or what ever we need and use this for the evaluation */
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int comsize;
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int alg, faninout, segsize, max_requests;
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size_t dsize;
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ompi_ddt_type_size (sdtype, &dsize);
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comsize = ompi_comm_size(comm);
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dsize *= comsize * scount;
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alg = ompi_coll_tuned_get_target_method_params (comm->c_coll_selected_data->com_rules[ALLTOALL],
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dsize, &faninout, &segsize, &max_requests);
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if (alg) { /* we have found a valid choice from the file based rules for this message size */
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return ompi_coll_tuned_alltoall_intra_do_this (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm,
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alg, faninout, segsize, max_requests);
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} /* found a method */
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} /*end if any com rules to check */
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if (comm->c_coll_selected_data->user_forced[ALLTOALL].algorithm) {
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return ompi_coll_tuned_alltoall_intra_do_forced (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
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}
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return ompi_coll_tuned_alltoall_intra_dec_fixed (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
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}
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/*
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* barrier_intra_dec
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*
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* Function: - seletects barrier algorithm to use
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* Accepts: - same arguments as MPI_Barrier()
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* Returns: - MPI_SUCCESS or error code (passed from the barrier implementation)
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*/
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int ompi_coll_tuned_barrier_intra_dec_dynamic(struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream,"ompi_coll_tuned_barrier_intra_dec_dynamic"));
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/* check to see if we have some filebased rules */
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if (comm->c_coll_selected_data->com_rules[BARRIER]) {
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/* we do, so calc the message size or what ever we need and use this for the evaluation */
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int alg, faninout, segsize, ignoreme;
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alg = ompi_coll_tuned_get_target_method_params (comm->c_coll_selected_data->com_rules[BARRIER],
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0, &faninout, &segsize, &ignoreme);
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if (alg) { /* we have found a valid choice from the file based rules for this message size */
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return ompi_coll_tuned_barrier_intra_do_this (comm,
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alg, faninout, segsize);
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} /* found a method */
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} /*end if any com rules to check */
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if (comm->c_coll_selected_data->user_forced[BARRIER].algorithm) {
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return ompi_coll_tuned_barrier_intra_do_forced (comm);
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}
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return ompi_coll_tuned_barrier_intra_dec_fixed (comm);
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}
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/*
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* bcast_intra_dec
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*
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* Function: - seletects broadcast algorithm to use
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* Accepts: - same arguments as MPI_Bcast()
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* Returns: - MPI_SUCCESS or error code (passed from the bcast implementation)
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*/
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int ompi_coll_tuned_bcast_intra_dec_dynamic(void *buff, int count,
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struct ompi_datatype_t *datatype, int root,
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struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream, "coll:tuned:bcast_intra_dec_dynamic"));
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/* check to see if we have some filebased rules */
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if (comm->c_coll_selected_data->com_rules[BCAST]) {
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/* we do, so calc the message size or what ever we need and use this for the evaluation */
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int alg, faninout, segsize, ignoreme;
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size_t dsize;
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ompi_ddt_type_size (datatype, &dsize);
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dsize *= count;
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alg = ompi_coll_tuned_get_target_method_params (comm->c_coll_selected_data->com_rules[BCAST],
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dsize, &faninout, &segsize, &ignoreme);
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if (alg) { /* we have found a valid choice from the file based rules for this message size */
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return ompi_coll_tuned_bcast_intra_do_this (buff, count, datatype, root, comm,
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alg, faninout, segsize);
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} /* found a method */
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} /*end if any com rules to check */
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if (comm->c_coll_selected_data->user_forced[BCAST].algorithm) {
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return ompi_coll_tuned_bcast_intra_do_forced (buff, count, datatype, root, comm);
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}
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return ompi_coll_tuned_bcast_intra_dec_fixed (buff, count, datatype, root, comm);
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}
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/*
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* reduce_intra_dec
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*
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* Function: - seletects reduce algorithm to use
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* Accepts: - same arguments as MPI_reduce()
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* Returns: - MPI_SUCCESS or error code (passed from the reduce implementation)
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*
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*/
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int ompi_coll_tuned_reduce_intra_dec_dynamic( void *sendbuf, void *recvbuf,
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int count, struct ompi_datatype_t* datatype,
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struct ompi_op_t* op, int root,
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struct ompi_communicator_t* comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream, "coll:tuned:reduce_intra_dec_dynamic"));
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/* check to see if we have some filebased rules */
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if (comm->c_coll_selected_data->com_rules[REDUCE]) {
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/* we do, so calc the message size or what ever we need and use this for the evaluation */
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int alg, faninout, segsize, max_requests;
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size_t dsize;
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ompi_ddt_type_size (datatype, &dsize);
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dsize *= count;
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alg = ompi_coll_tuned_get_target_method_params (comm->c_coll_selected_data->com_rules[REDUCE],
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dsize, &faninout, &segsize, &max_requests);
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if (alg) { /* we have found a valid choice from the file based rules for this message size */
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return ompi_coll_tuned_reduce_intra_do_this (sendbuf, recvbuf,
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count, datatype,
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op, root, comm,
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alg, faninout,
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segsize,
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max_requests);
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} /* found a method */
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} /*end if any com rules to check */
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if (comm->c_coll_selected_data->user_forced[REDUCE].algorithm) {
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return ompi_coll_tuned_reduce_intra_do_forced (sendbuf, recvbuf, count, datatype, op, root, comm);
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}
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return ompi_coll_tuned_reduce_intra_dec_fixed (sendbuf, recvbuf, count, datatype, op, root, comm);
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}
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/*
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* reduce_scatter_intra_dec
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*
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* Function: - seletects reduce_scatter algorithm to use
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* Accepts: - same arguments as MPI_Reduce_scatter()
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* Returns: - MPI_SUCCESS or error code (passed from
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* the reduce_scatter implementation)
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*
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*/
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int ompi_coll_tuned_reduce_scatter_intra_dec_dynamic(void *sbuf, void *rbuf,
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int *rcounts,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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struct ompi_communicator_t *comm )
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream, "coll:tuned:reduce_scatter_intra_dec_dynamic"));
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/* check to see if we have some filebased rules */
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if (comm->c_coll_selected_data->com_rules[REDUCESCATTER]) {
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/* we do, so calc the message size or what ever we need and use
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this for the evaluation */
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int alg, faninout, segsize, ignoreme, i, count, size;
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size_t dsize;
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size = ompi_comm_size(comm);
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for (i = 0, count = 0; i < size; i++) { count += rcounts[i];}
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ompi_ddt_type_size (dtype, &dsize);
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dsize *= count;
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alg = ompi_coll_tuned_get_target_method_params (comm->c_coll_selected_data->com_rules[REDUCESCATTER],
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dsize, &faninout,
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&segsize, &ignoreme);
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if (alg) {
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/* we have found a valid choice from the file based rules for
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this message size */
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return ompi_coll_tuned_reduce_scatter_intra_do_this (sbuf, rbuf,
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rcounts, dtype,
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op, comm,
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alg, faninout,
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segsize);
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} /* found a method */
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} /*end if any com rules to check */
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if (comm->c_coll_selected_data->user_forced[REDUCESCATTER].algorithm) {
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return ompi_coll_tuned_reduce_scatter_intra_do_forced (sbuf, rbuf,
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rcounts,
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dtype, op,
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comm);
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}
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return ompi_coll_tuned_reduce_scatter_intra_dec_fixed (sbuf, rbuf,
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rcounts, dtype,
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op, comm);
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}
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/*
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* allgather_intra_dec
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*
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* Function: - seletects allgather algorithm to use
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* Accepts: - same arguments as MPI_Allgather()
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* Returns: - MPI_SUCCESS or error code (passed from the selected
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* allgather function).
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*/
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int ompi_coll_tuned_allgather_intra_dec_dynamic(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void* rbuf, int rcount,
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struct ompi_datatype_t *rdtype,
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struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream,
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"ompi_coll_tuned_allgather_intra_dec_dynamic"));
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if (comm->c_coll_selected_data->com_rules[ALLGATHER]) {
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/* We have file based rules:
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- calculate message size and other necessary information */
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int comsize;
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int alg, faninout, segsize, ignoreme;
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size_t dsize;
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ompi_ddt_type_size (sdtype, &dsize);
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comsize = ompi_comm_size(comm);
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dsize *= comsize * scount;
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alg = ompi_coll_tuned_get_target_method_params (comm->c_coll_selected_data->com_rules[ALLGATHER],
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dsize, &faninout, &segsize, &ignoreme);
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if (alg) {
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/* we have found a valid choice from the file based rules for
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this message size */
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return ompi_coll_tuned_allgather_intra_do_this (sbuf, scount, sdtype,
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rbuf, rcount, rdtype,
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comm, alg, faninout,
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segsize);
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}
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}
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/* We do not have file based rules */
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if (comm->c_coll_selected_data->user_forced[ALLGATHER].algorithm) {
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/* User-forced algorithm */
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return ompi_coll_tuned_allgather_intra_do_forced (sbuf, scount, sdtype,
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rbuf, rcount, rdtype,
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comm);
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}
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/* Use default decision */
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return ompi_coll_tuned_allgather_intra_dec_fixed (sbuf, scount, sdtype,
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rbuf, rcount, rdtype,
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comm);
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}
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int ompi_coll_tuned_gather_intra_dec_dynamic(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void* rbuf, int rcount,
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struct ompi_datatype_t *rdtype,
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int root, struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream,
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"ompi_coll_tuned_gather_intra_dec_dynamic"));
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if (comm->c_coll_selected_data->user_forced[GATHER].algorithm) {
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return ompi_coll_tuned_gather_intra_do_forced (sbuf, scount, sdtype,
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rbuf, rcount, rdtype,
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root, comm);
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}
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return ompi_coll_tuned_gather_intra_dec_fixed (sbuf, scount, sdtype,
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rbuf, rcount, rdtype,
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root, comm);
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}
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int ompi_coll_tuned_scatter_intra_dec_dynamic(void *sbuf, int scount,
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struct ompi_datatype_t *sdtype,
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void* rbuf, int rcount,
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struct ompi_datatype_t *rdtype,
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int root, struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((ompi_coll_tuned_stream,
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"ompi_coll_tuned_scatter_intra_dec_dynamic"));
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if (comm->c_coll_selected_data->user_forced[SCATTER].algorithm) {
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return ompi_coll_tuned_scatter_intra_do_forced (sbuf, scount, sdtype,
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rbuf, rcount, rdtype,
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root, comm);
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}
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return ompi_coll_tuned_scatter_intra_dec_fixed (sbuf, scount, sdtype,
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rbuf, rcount, rdtype,
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root, comm);
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}
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