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b5c66a9d8c
BLIS-specific setting of threading takes precedence over OpenMP
thread count ICV values, and if the BLIS-specific threading APIs
are used, there was no way for the program to revert to OpenMP
settings. This patch implements a function bli_thread_reset() to
do this. This is similar to that implemented in upstream BLIS in
commit 6dcf7666ef
More specifically, it reverts the internal threading data to that
which existed when the program was launched, subject where appropriate
to any changes in the OpenMP ICVs. In other words:
- It will undo changes to threading set by previous calls to
bli_thread_set_num_threads or bli_thread_set_ways.
- If the environment variable BLIS_NUM_THREADS was used, this will
NOT be cleared, as the initial state of the program is restored.
- Changes to OpenMP ICVs from previous calls to omp_set_num_threads()
will still be in effect, but can be overridden by further calls to
omp_set_num_threads().
Note: the internal BLIS data structure updated by the threading APIs,
including bli_thread_reset(), is thread-local to each user
(e.g. application) thread.
Example usage:
omp_set_num_threads(4);
bli_thread_set_num_threads(7);
dgemm(...); // 7 threads will be used
bli_thread_reset();
dgemm(...); // 4 threads will be used
343 lines
9.2 KiB
C
343 lines
9.2 KiB
C
/*
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BLIS
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An object-based framework for developing high-performance BLAS-like
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libraries.
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Copyright (C) 2014, The University of Texas at Austin
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Copyright (C) 2016, Hewlett Packard Enterprise Development LP
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Copyright (C) 2018 - 2024, Advanced Micro Devices, Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name(s) of the copyright holder(s) nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BLIS_THREAD_H
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#define BLIS_THREAD_H
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// Include thread communicator (thrcomm_t) object definitions and prototypes.
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#include "bli_thrcomm.h"
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// Include thread info (thrinfo_t) object definitions and prototypes.
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#include "bli_thrinfo.h"
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#include "bli_thrinfo_sup.h"
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// Include some operation-specific thrinfo_t prototypes.
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// Note that the bli_packm_thrinfo.h must be included before the others!
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#include "bli_packm_thrinfo.h"
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#include "bli_l3_thrinfo.h"
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// Include the level-3 thread decorator and related definitions and prototypes
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// for the conventional code path.
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#include "bli_l3_decor.h"
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// Include the level-3 thread decorator and related definitions and prototypes
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// for the sup code path.
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#include "bli_l3_sup_decor.h"
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// Include the pack full thread decorator and related definitions and prototypes
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// for the pack code path.
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#include "bli_pack_full_decor.h"
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// Include the level-3 thread decorator and related definitions and prototypes
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// for the compute code path.
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#include "bli_l3_compute_decor.h"
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// Initialization-related prototypes.
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void bli_thread_init( void );
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void bli_thread_init_tl( void );
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void bli_thread_finalize( void );
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void bli_thread_finalize_tl( void );
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// Thread range-related prototypes.
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BLIS_EXPORT_BLIS
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void bli_thread_range_sub
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(
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thrinfo_t* thread,
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dim_t n,
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dim_t bf,
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bool handle_edge_low,
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dim_t* start,
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dim_t* end
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);
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#undef GENPROT
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#define GENPROT( opname ) \
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\
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siz_t PASTEMAC0( opname ) \
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( \
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dir_t direct, \
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thrinfo_t* thr, \
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obj_t* a, \
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obj_t* b, \
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obj_t* c, \
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cntl_t* cntl, \
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cntx_t* cntx, \
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dim_t* start, \
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dim_t* end \
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);
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GENPROT( thread_range_mdim )
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GENPROT( thread_range_ndim )
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#undef GENPROT
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#define GENPROT( opname ) \
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\
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siz_t PASTEMAC0( opname ) \
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( \
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thrinfo_t* thr, \
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obj_t* a, \
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blksz_t* bmult, \
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dim_t* start, \
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dim_t* end \
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);
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GENPROT( thread_range_l2r )
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GENPROT( thread_range_r2l )
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GENPROT( thread_range_t2b )
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GENPROT( thread_range_b2t )
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GENPROT( thread_range_weighted_l2r )
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GENPROT( thread_range_weighted_r2l )
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GENPROT( thread_range_weighted_t2b )
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GENPROT( thread_range_weighted_b2t )
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dim_t bli_thread_range_width_l
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(
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doff_t diagoff_j,
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dim_t m,
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dim_t n_j,
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dim_t j,
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dim_t n_way,
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dim_t bf,
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dim_t bf_left,
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double area_per_thr,
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bool handle_edge_low
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);
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siz_t bli_find_area_trap_l
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(
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dim_t m,
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dim_t n,
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doff_t diagoff
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);
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siz_t bli_thread_range_weighted_sub
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(
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thrinfo_t* restrict thread,
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doff_t diagoff,
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uplo_t uplo,
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dim_t m,
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dim_t n,
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dim_t bf,
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bool handle_edge_low,
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dim_t* restrict j_start_thr,
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dim_t* restrict j_end_thr
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);
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// -----------------------------------------------------------------------------
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// Factorization and partitioning prototypes
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typedef struct
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{
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dim_t n;
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dim_t sqrt_n;
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dim_t f;
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} bli_prime_factors_t;
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void bli_prime_factorization(dim_t n, bli_prime_factors_t* factors);
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dim_t bli_next_prime_factor(bli_prime_factors_t* factors);
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bool bli_is_prime( dim_t n );
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void bli_thread_partition_2x2
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(
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dim_t n_thread,
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dim_t work1,
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dim_t work2,
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dim_t* restrict nt1,
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dim_t* restrict nt2
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);
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void bli_thread_partition_2x2_slow
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(
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dim_t n_thread,
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dim_t work1,
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dim_t work2,
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dim_t* restrict nt1,
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dim_t* restrict nt2
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);
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void bli_thread_partition_2x2_fast
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(
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dim_t n_thread,
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dim_t work1,
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dim_t work2,
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dim_t* restrict nt1,
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dim_t* restrict nt2
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);
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void bli_thread_vector_partition
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(
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dim_t n_elem,
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dim_t t_count,
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dim_t* start,
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dim_t* compute_len,
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dim_t thread_id
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);
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void bli_normfv_thread_partition
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(
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dim_t n_elem,
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dim_t t_count,
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dim_t* start,
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dim_t* compute_len,
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dim_t block_size,
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dim_t incx,
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dim_t thread_id
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);
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// -----------------------------------------------------------------------------
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dim_t bli_gcd( dim_t x, dim_t y );
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dim_t bli_lcm( dim_t x, dim_t y );
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dim_t bli_ipow( dim_t base, dim_t power );
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// -----------------------------------------------------------------------------
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BLIS_EXPORT_BLIS dim_t bli_thread_get_jc_nt( void );
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BLIS_EXPORT_BLIS dim_t bli_thread_get_pc_nt( void );
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BLIS_EXPORT_BLIS dim_t bli_thread_get_ic_nt( void );
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BLIS_EXPORT_BLIS dim_t bli_thread_get_jr_nt( void );
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BLIS_EXPORT_BLIS dim_t bli_thread_get_ir_nt( void );
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BLIS_EXPORT_BLIS dim_t bli_thread_get_num_threads( void );
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BLIS_EXPORT_BLIS bool bli_thread_get_is_parallel( void );
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BLIS_EXPORT_BLIS void bli_thread_set_ways( dim_t jc, dim_t pc, dim_t ic, dim_t jr, dim_t ir );
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BLIS_EXPORT_BLIS void bli_thread_set_num_threads( dim_t value );
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BLIS_EXPORT_BLIS void bli_thread_init_rntm_from_env( rntm_t* rntm );
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BLIS_EXPORT_BLIS void bli_thread_init_rntm_from_global_rntm( rntm_t* rntm );
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BLIS_EXPORT_BLIS void bli_thread_update_rntm_from_env( rntm_t* rntm );
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BLIS_EXPORT_BLIS void bli_thread_reset();
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// -----------------------------------------------------------------------------
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BLIS_INLINE void bli_thread_range_jrir_rr
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(
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thrinfo_t* thread,
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dim_t n,
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dim_t bf,
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bool handle_edge_low,
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dim_t* start,
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dim_t* end,
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dim_t* inc
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)
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{
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// Use interleaved partitioning of jr/ir loops.
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*start = bli_thread_work_id( thread );
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*inc = bli_thread_n_way( thread );
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*end = n;
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}
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BLIS_INLINE void bli_thread_range_jrir_sl
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(
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thrinfo_t* thread,
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dim_t n,
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dim_t bf,
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bool handle_edge_low,
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dim_t* start,
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dim_t* end,
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dim_t* inc
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)
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{
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// Use contiguous slab partitioning of jr/ir loops.
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bli_thread_range_sub( thread, n, bf, handle_edge_low, start, end );
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*inc = 1;
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}
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BLIS_INLINE void bli_thread_range_jrir
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(
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thrinfo_t* thread,
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dim_t n,
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dim_t bf,
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bool handle_edge_low,
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dim_t* start,
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dim_t* end,
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dim_t* inc
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)
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{
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// Define a general-purpose version of bli_thread_range_jrir() whose
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// definition depends on whether slab or round-robin partitioning was
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// requested at configure-time.
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#ifdef BLIS_ENABLE_JRIR_SLAB
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bli_thread_range_jrir_sl( thread, n, bf, handle_edge_low, start, end, inc );
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#else
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bli_thread_range_jrir_rr( thread, n, bf, handle_edge_low, start, end, inc );
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#endif
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}
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#if 0
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BLIS_INLINE void bli_thread_range_weighted_jrir
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(
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thrinfo_t* thread,
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doff_t diagoff,
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uplo_t uplo,
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dim_t m,
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dim_t n,
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dim_t bf,
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bool handle_edge_low,
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dim_t* start,
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dim_t* end,
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dim_t* inc
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)
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{
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#ifdef BLIS_ENABLE_JRIR_SLAB
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// Use contiguous slab partitioning for jr/ir loops.
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bli_thread_range_weighted_sub( thread, diagoff, uplo, m, n, bf,
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handle_edge_low, start, end );
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*start = *start / bf; *inc = 1;
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if ( *end % bf ) *end = *end / bf + 1;
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else *end = *end / bf;
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#else
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// Use interleaved partitioning of jr/ir loops.
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*start = bli_thread_work_id( thread );
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*inc = bli_thread_n_way( thread );
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*end = n;
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#endif
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}
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#endif
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#endif
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