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/*
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* -- High Performance Computing Linpack Benchmark (HPL)
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* HPL - 2.0 - September 10, 2008
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* Antoine P. Petitet
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* University of Tennessee, Knoxville
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* Innovative Computing Laboratory
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* (C) Copyright 2000-2008 All Rights Reserved
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*
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* -- Copyright notice and Licensing terms:
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*
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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
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* are met:
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*
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* 1. 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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*
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* 2. 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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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgement:
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* This product includes software developed at the University of
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* Tennessee, Knoxville, Innovative Computing Laboratory.
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*
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* 4. The name of the University, the name of the Laboratory, or the
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* names of its contributors may not be used to endorse or promote
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* products derived from this software without specific written
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* permission.
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*
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* -- Disclaimer:
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*
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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 UNIVERSITY
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* 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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*/
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/*
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* Include files
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*/
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#include "hpl.h" |
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#ifdef STDC_HEADERS
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void HPL_spreadN
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( |
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HPL_T_panel * PBCST, |
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int * IFLAG,
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HPL_T_panel * PANEL, |
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const enum HPL_SIDE SIDE, |
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const int N, |
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double * U,
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const int LDU, |
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const int SRCDIST, |
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const int * IPLEN, |
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const int * IPMAP, |
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const int * IPMAPM1 |
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) |
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#else
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void HPL_spreadN
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( PBCST, IFLAG, PANEL, SIDE, N, U, LDU, SRCDIST, IPLEN, IPMAP, IPMAPM1 ) |
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HPL_T_panel * PBCST; |
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int * IFLAG;
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HPL_T_panel * PANEL; |
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const enum HPL_SIDE SIDE; |
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const int N; |
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double * U;
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const int LDU; |
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const int SRCDIST; |
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const int * IPLEN; |
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const int * IPMAP; |
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const int * IPMAPM1; |
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#endif
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{
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/*
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* Purpose
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* =======
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*
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* HPL_spreadN spreads the local array containing local pieces of U, so
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* that on exit to this function, a piece of U is contained in every
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* process row. The array IPLEN contains the number of rows of U, that
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* should be spread on any given process row. This function also probes
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* for the presence of the column panel PBCST. In case of success, this
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* panel will be forwarded. If PBCST is NULL on input, this probing
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* mechanism will be disabled.
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*
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* Arguments
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* =========
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*
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* PBCST (local input/output) HPL_T_panel *
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* On entry, PBCST points to the data structure containing the
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* panel (to be broadcast) information.
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*
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* IFLAG (local input/output) int *
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* On entry, IFLAG indicates whether or not the broadcast has
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* already been completed. If not, probing will occur, and the
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* outcome will be contained in IFLAG on exit.
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*
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* PANEL (local input/output) HPL_T_panel *
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* On entry, PANEL points to the data structure containing the
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* panel (to be spread) information.
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*
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* SIDE (global input) const enum HPL_SIDE
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* On entry, SIDE specifies whether the local piece of U located
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* in process IPMAP[SRCDIST] should be spread to the right or to
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* the left. This feature is used by the equilibration process.
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*
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* N (global input) const int
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* On entry, N specifies the local number of columns of U. N
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* must be at least zero.
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*
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* U (local input/output) double *
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* On entry, U is an array of dimension (LDU,*) containing the
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* local pieces of U.
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*
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* LDU (local input) const int
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* On entry, LDU specifies the local leading dimension of U. LDU
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* should be at least MAX(1,IPLEN[nprow]).
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*
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* SRCDIST (local input) const int
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* On entry, SRCDIST specifies the source process that spreads
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* its piece of U.
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*
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* IPLEN (global input) const int *
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* On entry, IPLEN is an array of dimension NPROW+1. This array
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* is such that IPLEN[i+1] - IPLEN[i] is the number of rows of U
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* in each process before process IPMAP[i], with the convention
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* that IPLEN[nprow] is the total number of rows. In other words
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* IPLEN[i+1] - IPLEN[i] is the local number of rows of U that
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* should be moved to process IPMAP[i].
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*
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* IPMAP (global input) const int *
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* On entry, IPMAP is an array of dimension NPROW. This array
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* contains the logarithmic mapping of the processes. In other
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* words, IPMAP[myrow] is the absolute coordinate of the sorted
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* process.
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*
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* IPMAPM1 (global input) const int *
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* On entry, IPMAPM1 is an array of dimension NPROW. This array
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* contains the inverse of the logarithmic mapping contained in
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* IPMAP: For i in [0.. NPROW) IPMAPM1[IPMAP[i]] = i.
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*
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* ---------------------------------------------------------------------
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*/
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/*
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* .. Local Variables ..
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*/
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MPI_Datatype type; |
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MPI_Status status; |
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MPI_Comm comm; |
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unsigned int ip2=1, mask=1, mydist, mydist2; |
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int Cmsgid=MSGID_BEGIN_PFACT, ibuf,
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ierr=MPI_SUCCESS, il, k, lbuf, lgth, myrow, |
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npm1, nprow, partner; |
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/* ..
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* .. Executable Statements ..
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*/
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myrow = PANEL->grid->myrow; nprow = PANEL->grid->nprow; |
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comm = PANEL->grid->col_comm; |
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/*
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* Spread U to the left
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*/
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if( SIDE == HplLeft )
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{
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nprow = ( npm1 = SRCDIST ) + 1;
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if( ( ( mydist = (unsigned int)(IPMAPM1[myrow]) ) > |
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(unsigned int)(SRCDIST) ) || ( npm1 == 0 ) ) return; |
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k = npm1; while( k > 1 ) { k >>= 1; ip2 <<= 1; mask <<= 1; mask++; } |
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mydist2 = ( mydist = npm1 - mydist ); il = npm1 - ip2; |
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lgth = IPLEN[nprow]; |
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do
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{
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mask ^= ip2; |
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if( ( mydist & mask ) == 0 ) |
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{
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lbuf = IPLEN[il+1] - ( ibuf = IPLEN[il-Mmin(il, (int)(ip2))] ); |
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if( lbuf > 0 ) |
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{
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partner = mydist ^ ip2; |
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if( mydist & ip2 )
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{
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_vector( N, lbuf, LDU, MPI_DOUBLE, |
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&type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_commit( &type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Recv( Mptr( U, ibuf, 0, LDU ), 1, type, |
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IPMAP[npm1-partner], Cmsgid, comm, |
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&status ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_free( &type ); |
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} |
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else if( partner < nprow ) |
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{
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_vector( N, lbuf, LDU, MPI_DOUBLE, |
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&type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_commit( &type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Send( Mptr( U, ibuf, 0, LDU ), 1, type, |
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IPMAP[npm1-partner], Cmsgid, comm ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_free( &type ); |
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} |
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} |
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} |
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if( mydist2 < ip2 ) { ip2 >>= 1; il += ip2; } |
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else { mydist2 -= ip2; ip2 >>= 1; il -= ip2; } |
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/*
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* Probe for column panel - forward it when available
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*/
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if( *IFLAG == HPL_KEEP_TESTING ) (void) HPL_bcast( PBCST, IFLAG ); |
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} while( ip2 > 0 ); |
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} |
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else
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{
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npm1 = ( nprow -= SRCDIST ) - 1;
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if( ( ( mydist = (unsigned int)(IPMAPM1[myrow]) ) < |
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(unsigned int)(SRCDIST) ) || ( npm1 == 0 ) ) return; |
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k = npm1; while( k > 1 ) { k >>= 1; ip2 <<= 1; mask <<= 1; mask++; } |
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mydist2 = ( mydist -= SRCDIST ); il = ip2; |
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lgth = IPLEN[SRCDIST+nprow]; |
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/*
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* Spread U to the right - offset the IPLEN, and IPMAP arrays
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*/
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do
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{
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mask ^= ip2; |
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if( ( mydist & mask ) == 0 ) |
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{
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k = il + ip2; ibuf = IPLEN[SRCDIST+il]; |
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lbuf = ( k >= nprow ? lgth : IPLEN[SRCDIST+k] ) - ibuf; |
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if( lbuf > 0 ) |
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{
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partner = mydist ^ ip2; |
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if( mydist & ip2 )
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{
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_vector( N, lbuf, LDU, MPI_DOUBLE, |
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&type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_commit( &type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Recv( Mptr( U, ibuf, 0, LDU ), 1, type, |
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IPMAP[SRCDIST+partner], Cmsgid, |
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comm, &status ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_free( &type ); |
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} |
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else if( partner < nprow ) |
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{
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_vector( N, lbuf, LDU, MPI_DOUBLE, |
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&type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_commit( &type ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Send( Mptr( U, ibuf, 0, LDU ), 1, type, |
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IPMAP[SRCDIST+partner], Cmsgid, |
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comm ); |
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if( ierr == MPI_SUCCESS )
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ierr = MPI_Type_free( &type ); |
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} |
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} |
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} |
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if( mydist2 < ip2 ) { ip2 >>= 1; il -= ip2; } |
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else { mydist2 -= ip2; ip2 >>= 1; il += ip2; } |
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/*
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* Probe for column panel - forward it when available
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*/
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if( *IFLAG == HPL_KEEP_TESTING ) (void) HPL_bcast( PBCST, IFLAG ); |
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} while( ip2 > 0 ); |
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} |
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if( ierr != MPI_SUCCESS )
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{ HPL_pabort( __LINE__, "HPL_spreadN", "MPI call failed" ); }
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/*
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* End of HPL_spreadN
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*/
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} |