root / src / grid / HPL_broadcast.c @ 9
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| 1 | 1 | equemene | /*
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| 2 | 1 | equemene | * -- High Performance Computing Linpack Benchmark (HPL)
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| 3 | 1 | equemene | * HPL - 2.0 - September 10, 2008
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| 4 | 1 | equemene | * Antoine P. Petitet
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| 5 | 1 | equemene | * University of Tennessee, Knoxville
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| 6 | 1 | equemene | * Innovative Computing Laboratory
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| 7 | 1 | equemene | * (C) Copyright 2000-2008 All Rights Reserved
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| 8 | 1 | equemene | *
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| 9 | 1 | equemene | * -- Copyright notice and Licensing terms:
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| 10 | 1 | equemene | *
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| 11 | 1 | equemene | * Redistribution and use in source and binary forms, with or without
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| 12 | 1 | equemene | * modification, are permitted provided that the following conditions
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| 13 | 1 | equemene | * are met:
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| 14 | 1 | equemene | *
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| 15 | 1 | equemene | * 1. Redistributions of source code must retain the above copyright
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| 16 | 1 | equemene | * notice, this list of conditions and the following disclaimer.
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| 17 | 1 | equemene | *
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| 18 | 1 | equemene | * 2. Redistributions in binary form must reproduce the above copyright
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| 19 | 1 | equemene | * notice, this list of conditions, and the following disclaimer in the
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| 20 | 1 | equemene | * documentation and/or other materials provided with the distribution.
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| 21 | 1 | equemene | *
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| 22 | 1 | equemene | * 3. All advertising materials mentioning features or use of this
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| 23 | 1 | equemene | * software must display the following acknowledgement:
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| 24 | 1 | equemene | * This product includes software developed at the University of
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| 25 | 1 | equemene | * Tennessee, Knoxville, Innovative Computing Laboratory.
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| 26 | 1 | equemene | *
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| 27 | 1 | equemene | * 4. The name of the University, the name of the Laboratory, or the
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| 28 | 1 | equemene | * names of its contributors may not be used to endorse or promote
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| 29 | 1 | equemene | * products derived from this software without specific written
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| 30 | 1 | equemene | * permission.
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| 31 | 1 | equemene | *
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| 32 | 1 | equemene | * -- Disclaimer:
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| 33 | 1 | equemene | *
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| 34 | 1 | equemene | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 35 | 1 | equemene | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 36 | 1 | equemene | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 37 | 1 | equemene | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY
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| 38 | 1 | equemene | * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 39 | 1 | equemene | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 40 | 1 | equemene | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 41 | 1 | equemene | * DATA OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 42 | 1 | equemene | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 43 | 1 | equemene | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 44 | 1 | equemene | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 45 | 1 | equemene | * ---------------------------------------------------------------------
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| 46 | 1 | equemene | */
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| 47 | 1 | equemene | /*
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| 48 | 1 | equemene | * Include files
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| 49 | 1 | equemene | */
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| 50 | 1 | equemene | #include "hpl.h" |
| 51 | 1 | equemene | |
| 52 | 1 | equemene | #ifdef STDC_HEADERS
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| 53 | 1 | equemene | int HPL_broadcast
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| 54 | 1 | equemene | ( |
| 55 | 1 | equemene | void * BUFFER,
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| 56 | 1 | equemene | const int COUNT, |
| 57 | 1 | equemene | const HPL_T_TYPE DTYPE,
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| 58 | 1 | equemene | const int ROOT, |
| 59 | 1 | equemene | MPI_Comm COMM |
| 60 | 1 | equemene | ) |
| 61 | 1 | equemene | #else
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| 62 | 1 | equemene | int HPL_broadcast
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| 63 | 1 | equemene | ( BUFFER, COUNT, DTYPE, ROOT, COMM ) |
| 64 | 1 | equemene | void * BUFFER;
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| 65 | 1 | equemene | const int COUNT; |
| 66 | 1 | equemene | const HPL_T_TYPE DTYPE;
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| 67 | 1 | equemene | const int ROOT; |
| 68 | 1 | equemene | MPI_Comm COMM; |
| 69 | 1 | equemene | #endif
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| 70 | 1 | equemene | {
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| 71 | 1 | equemene | /*
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| 72 | 1 | equemene | * Purpose
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| 73 | 1 | equemene | * =======
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| 74 | 1 | equemene | *
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| 75 | 1 | equemene | * HPL_broadcast broadcasts a message from the process with rank ROOT to
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| 76 | 1 | equemene | * all processes in the group.
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| 77 | 1 | equemene | *
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| 78 | 1 | equemene | * Arguments
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| 79 | 1 | equemene | * =========
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| 80 | 1 | equemene | *
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| 81 | 1 | equemene | * BUFFER (local input/output) void *
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| 82 | 1 | equemene | * On entry, BUFFER points to the buffer to be broadcast. On
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| 83 | 1 | equemene | * exit, this array contains the broadcast data and is identical
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| 84 | 1 | equemene | * on all processes in the group.
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| 85 | 1 | equemene | *
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| 86 | 1 | equemene | * COUNT (global input) const int
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| 87 | 1 | equemene | * On entry, COUNT indicates the number of entries in BUFFER.
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| 88 | 1 | equemene | * COUNT must be at least zero.
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| 89 | 1 | equemene | *
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| 90 | 1 | equemene | * DTYPE (global input) const HPL_T_TYPE
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| 91 | 1 | equemene | * On entry, DTYPE specifies the type of the buffers operands.
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| 92 | 1 | equemene | *
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| 93 | 1 | equemene | * ROOT (global input) const int
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| 94 | 1 | equemene | * On entry, ROOT is the coordinate of the source process.
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| 95 | 1 | equemene | *
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| 96 | 1 | equemene | * COMM (global/local input) MPI_Comm
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| 97 | 1 | equemene | * The MPI communicator identifying the process collection.
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| 98 | 1 | equemene | *
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| 99 | 1 | equemene | * ---------------------------------------------------------------------
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| 100 | 1 | equemene | */
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| 101 | 1 | equemene | /*
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| 102 | 1 | equemene | * .. Local Variables ..
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| 103 | 1 | equemene | */
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| 104 | 1 | equemene | int hplerr=MPI_SUCCESS, ip2=1, kk, mask=1, |
| 105 | 1 | equemene | mpierr, mydist, partner, rank, size, |
| 106 | 1 | equemene | tag = MSGID_BEGIN_COLL; |
| 107 | 1 | equemene | MPI_Status status; |
| 108 | 1 | equemene | /* ..
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| 109 | 1 | equemene | * .. Executable Statements ..
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| 110 | 1 | equemene | */
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| 111 | 1 | equemene | if( COUNT <= 0 ) return( MPI_SUCCESS ); |
| 112 | 1 | equemene | mpierr = MPI_Comm_size( COMM, &size ); if( size <= 1 ) return( mpierr ); |
| 113 | 1 | equemene | mpierr = MPI_Comm_rank( COMM, &rank ); |
| 114 | 1 | equemene | |
| 115 | 1 | equemene | kk = size - 1;
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| 116 | 1 | equemene | while( kk > 1 ) { kk >>= 1; ip2 <<= 1; mask <<= 1; mask++; } |
| 117 | 1 | equemene | mydist = MModSub( rank, ROOT, size ); |
| 118 | 1 | equemene | |
| 119 | 1 | equemene | do
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| 120 | 1 | equemene | {
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| 121 | 1 | equemene | mask ^= ip2; |
| 122 | 1 | equemene | if( ( mydist & mask ) == 0 ) |
| 123 | 1 | equemene | {
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| 124 | 1 | equemene | partner = mydist ^ ip2; |
| 125 | 1 | equemene | |
| 126 | 1 | equemene | if( mydist & ip2 )
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| 127 | 1 | equemene | {
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| 128 | 1 | equemene | partner = MModAdd( ROOT, partner, size ); |
| 129 | 1 | equemene | mpierr = MPI_Recv( BUFFER, COUNT, HPL_2_MPI_TYPE( DTYPE ), |
| 130 | 1 | equemene | partner, tag, COMM, &status ); |
| 131 | 1 | equemene | } |
| 132 | 1 | equemene | else if( partner < size ) |
| 133 | 1 | equemene | {
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| 134 | 1 | equemene | partner = MModAdd( ROOT, partner, size ); |
| 135 | 1 | equemene | mpierr = MPI_Send( BUFFER, COUNT, HPL_2_MPI_TYPE( DTYPE ), |
| 136 | 1 | equemene | partner, tag, COMM ); |
| 137 | 1 | equemene | } |
| 138 | 1 | equemene | if( mpierr != MPI_SUCCESS ) hplerr = mpierr;
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| 139 | 1 | equemene | } |
| 140 | 1 | equemene | ip2 >>= 1;
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| 141 | 1 | equemene | } while( ip2 );
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| 142 | 1 | equemene | |
| 143 | 1 | equemene | return( hplerr );
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| 144 | 1 | equemene | /*
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| 145 | 1 | equemene | * End of HPL_broadcast
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| 146 | 1 | equemene | */
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| 147 | 1 | equemene | } |