[417] | 1 | /////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File : sort.c |
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| 3 | // Date : November 2013 |
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| 4 | // Author : Cesar Fuguet Tortolero <cesar.fuguet-tortolero@lip6.fr> |
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| 5 | /////////////////////////////////////////////////////////////////////////////// |
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| 6 | // This multi-threaded application implement a multi-stage sort application. |
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| 7 | // The various stages are separated by synchronisation barriers. |
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| 8 | // There is one thread per physical cores. |
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| 9 | // Computation is organised as a binary tree: |
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| 10 | // - All threads execute in parallel a buble sort on a sub-array during the |
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| 11 | // the first stage of parallel sort, |
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| 12 | // - The number of participating threads is divided by 2 at each next stage, |
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| 13 | // to make a merge sort, on two subsets of previous stage. |
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| 14 | // |
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| 15 | // Number_of_stages = number of barriers = log2(Number_of_threads) |
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| 16 | // |
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| 17 | // Constraints : |
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| 18 | // - It supports up to 1024 cores: x_size, y_size, and ncores must be |
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| 19 | // power of 2 (max 16*16 clusters / max 4 cores per cluster) |
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| 20 | // _ The array of values to be sorted (ARRAY_LENGTH) must be power of 2 |
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| 21 | // larger than the number of cores. |
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| 22 | /////////////////////////////////////////////////////////////////////////////// |
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| 23 | |
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| 24 | #include <stdio.h> |
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| 25 | #include <stdlib.h> |
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[596] | 26 | #include <unistd.h> |
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[417] | 27 | #include <pthread.h> |
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[445] | 28 | #include <almosmkh.h> |
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[459] | 29 | #include <hal_macros.h> |
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[417] | 30 | |
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[625] | 31 | #define ARRAY_LENGTH 256 // number of items |
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[588] | 32 | #define MAX_THREADS 1024 // 16 * 16 * 4 |
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[440] | 33 | |
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[623] | 34 | #define USE_DQT_BARRIER 1 // use DQT barrier if non zero |
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| 35 | #define DISPLAY_ARRAY 0 // display items values before and after |
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| 36 | #define VERBOSE 0 // for debug |
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| 37 | #define INTERACTIVE_MODE 0 // for debug |
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| 38 | #define CHECK_RESULT 0 // for debug |
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| 39 | #define INSTRUMENTATION 1 // register computation times on file |
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| 40 | |
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[417] | 41 | ///////////////////////////////////////////////////////////// |
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| 42 | // argument for the sort() function (one thread per core) |
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| 43 | ///////////////////////////////////////////////////////////// |
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| 44 | |
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| 45 | typedef struct |
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| 46 | { |
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[619] | 47 | unsigned int threads; // total number of threads |
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[417] | 48 | unsigned int thread_uid; // thread user index (0 to threads -1) |
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| 49 | unsigned int main_uid; // main thread user index |
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| 50 | } |
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| 51 | args_t; |
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| 52 | |
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| 53 | ////////////////////////////////////////// |
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| 54 | // Global variables |
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| 55 | ////////////////////////////////////////// |
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| 56 | |
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| 57 | int array0[ARRAY_LENGTH]; // values to sort |
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| 58 | int array1[ARRAY_LENGTH]; |
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| 59 | |
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| 60 | pthread_barrier_t barrier; // synchronisation variables |
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| 61 | |
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[440] | 62 | pthread_attr_t attr[MAX_THREADS]; // thread attributes (one per thread) |
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| 63 | args_t arg[MAX_THREADS]; // sort function arguments (one per thread) |
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[417] | 64 | |
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| 65 | //////////////////////////////////// |
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[588] | 66 | static void bubbleSort( int * array, |
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| 67 | unsigned int length, |
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| 68 | unsigned int init_pos ) |
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[417] | 69 | { |
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[473] | 70 | unsigned int i; |
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| 71 | unsigned int j; |
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| 72 | int aux; |
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[417] | 73 | |
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| 74 | for(i = 0; i < length; i++) |
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| 75 | { |
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| 76 | for(j = init_pos; j < (init_pos + length - i - 1); j++) |
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| 77 | { |
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| 78 | if(array[j] > array[j + 1]) |
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| 79 | { |
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| 80 | aux = array[j + 1]; |
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| 81 | array[j + 1] = array[j]; |
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| 82 | array[j] = aux; |
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| 83 | } |
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| 84 | } |
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| 85 | } |
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| 86 | } // end bubbleSort() |
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| 87 | |
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| 88 | |
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[588] | 89 | /////////////////////////////////// |
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[623] | 90 | static void merge( const int * src, // source array |
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| 91 | int * dst, // destination array |
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| 92 | int length, // number of items in a subset |
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| 93 | int init_pos_src_a, // index first item in src subset A |
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| 94 | int init_pos_src_b, // index first item in src subset B |
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| 95 | int init_pos_dst ) // index first item in destination |
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[417] | 96 | { |
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| 97 | int i; |
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| 98 | int j; |
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| 99 | int k; |
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| 100 | |
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| 101 | i = 0; |
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| 102 | j = 0; |
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| 103 | k = init_pos_dst; |
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| 104 | |
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| 105 | while((i < length) || (j < length)) |
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| 106 | { |
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| 107 | if((i < length) && (j < length)) |
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| 108 | { |
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| 109 | if(src[init_pos_src_a + i] < src[init_pos_src_b + j]) |
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| 110 | { |
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| 111 | dst[k++] = src[init_pos_src_a + i]; |
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| 112 | i++; |
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| 113 | } |
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| 114 | else |
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| 115 | { |
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| 116 | dst[k++] = src[init_pos_src_b + j]; |
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| 117 | j++; |
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| 118 | } |
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| 119 | } |
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| 120 | else if(i < length) |
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| 121 | { |
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| 122 | dst[k++] = src[init_pos_src_a + i]; |
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| 123 | i++; |
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| 124 | } |
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| 125 | else |
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| 126 | { |
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| 127 | dst[k++] = src[init_pos_src_b + j]; |
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| 128 | j++; |
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| 129 | } |
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| 130 | } |
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| 131 | } // end merge() |
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| 132 | |
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[588] | 133 | ////////////////////////////////////// |
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[504] | 134 | static void sort( const args_t * ptr ) |
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[417] | 135 | { |
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| 136 | unsigned int i; |
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| 137 | unsigned long long cycle; |
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[440] | 138 | unsigned int cxy; |
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| 139 | unsigned int lid; |
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[417] | 140 | |
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[623] | 141 | int * src_array = NULL; |
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| 142 | int * dst_array = NULL; |
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[417] | 143 | |
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[440] | 144 | // get core coordinates an date |
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| 145 | get_core( &cxy , &lid ); |
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| 146 | get_cycle( &cycle ); |
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| 147 | |
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[417] | 148 | unsigned int thread_uid = ptr->thread_uid; |
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| 149 | unsigned int threads = ptr->threads; |
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| 150 | unsigned int main_uid = ptr->main_uid; |
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| 151 | |
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[623] | 152 | #if DISPLAY_ARRAY |
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| 153 | unsigned int n; |
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| 154 | if( thread_uid == main_uid ) |
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| 155 | { |
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| 156 | printf("\n*** array before sort\n"); |
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| 157 | for( n=0; n<ARRAY_LENGTH; n++) printf("array[%d] = %d\n", n , array0[n] ); |
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| 158 | } |
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| 159 | #endif |
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| 160 | |
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| 161 | ///////////////////////////////// |
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| 162 | pthread_barrier_wait( &barrier ); |
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| 163 | |
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| 164 | #if VERBOSE |
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| 165 | printf("\n[sort] thread[%d] exit barrier 0\n", thread_uid ); |
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| 166 | #endif |
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| 167 | |
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[417] | 168 | unsigned int items = ARRAY_LENGTH / threads; |
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| 169 | unsigned int stages = __builtin_ctz( threads ) + 1; |
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| 170 | |
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[623] | 171 | #if VERBOSE |
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| 172 | printf("\n[sort] thread[%d] : start\n", thread_uid ); |
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| 173 | #endif |
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[442] | 174 | |
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[417] | 175 | bubbleSort( array0, items, items * thread_uid ); |
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| 176 | |
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[623] | 177 | #if VERBOSE |
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| 178 | printf("\n[sort] thread[%d] : stage 0 completed\n", thread_uid ); |
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| 179 | #endif |
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[417] | 180 | |
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| 181 | ///////////////////////////////// |
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| 182 | pthread_barrier_wait( &barrier ); |
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[440] | 183 | |
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[623] | 184 | #if VERBOSE |
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| 185 | printf("\n[sort] thread[%d] exit barrier 0\n", thread_uid ); |
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| 186 | #endif |
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| 187 | |
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| 188 | #if DISPLAY_ARRAY |
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| 189 | if( thread_uid == main_uid ) |
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| 190 | { |
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| 191 | printf("\n*** array after bubble sort\n"); |
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| 192 | for( n=0; n<ARRAY_LENGTH; n++) printf("array[%d] = %d\n", n , array0[n] ); |
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| 193 | } |
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| 194 | #endif |
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| 195 | |
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| 196 | // the number of threads contributing to sort is divided by 2 |
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| 197 | // and the number of items is multiplied by 2 at each next stage |
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[417] | 198 | for ( i = 1 ; i < stages ; i++ ) |
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| 199 | { |
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[623] | 200 | if((i % 2) == 1) // odd stage |
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| 201 | { |
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| 202 | src_array = array0; |
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| 203 | dst_array = array1; |
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| 204 | } |
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| 205 | else // even stage |
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| 206 | { |
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| 207 | src_array = array1; |
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| 208 | dst_array = array0; |
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| 209 | } |
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[417] | 210 | |
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| 211 | if( (thread_uid & ((1<<i)-1)) == 0 ) |
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| 212 | { |
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| 213 | |
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[623] | 214 | #if VERBOSE |
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| 215 | printf("\n[sort] thread[%d] : stage %d start\n", thread_uid , i ); |
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| 216 | #endif |
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[417] | 217 | merge( src_array, |
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| 218 | dst_array, |
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[623] | 219 | items << (i-1), |
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[417] | 220 | items * thread_uid, |
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| 221 | items * (thread_uid + (1 << (i-1))), |
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| 222 | items * thread_uid ); |
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| 223 | |
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[623] | 224 | #if VERBOSE |
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| 225 | printf("\n[sort] thread[%d] : stage %d completed\n", thread_uid , i ); |
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| 226 | #endif |
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[417] | 227 | } |
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| 228 | |
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| 229 | ///////////////////////////////// |
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| 230 | pthread_barrier_wait( &barrier ); |
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| 231 | |
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[623] | 232 | #if VERBOSE |
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| 233 | printf("\n[sort] thread[%d] exit barrier %d\n", thread_uid , i ); |
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| 234 | #endif |
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[417] | 235 | |
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[623] | 236 | #if DISPLAY_ARRAY |
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| 237 | if( thread_uid == main_uid ) |
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| 238 | { |
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| 239 | printf("\n*** array after merge %d\n", i ); |
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| 240 | for( n=0; n<ARRAY_LENGTH; n++) printf("array[%d] = %d\n", n , dst_array[n] ); |
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| 241 | } |
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| 242 | #endif |
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| 243 | |
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| 244 | } // en for stages |
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| 245 | |
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[417] | 246 | // all threads but the main thread exit |
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| 247 | if( thread_uid != main_uid ) pthread_exit( NULL ); |
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| 248 | |
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| 249 | } // end sort() |
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| 250 | |
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| 251 | |
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[574] | 252 | ///////////////// |
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[475] | 253 | void main( void ) |
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[417] | 254 | { |
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[619] | 255 | int error; |
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[417] | 256 | unsigned int x_size; // number of rows |
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| 257 | unsigned int y_size; // number of columns |
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| 258 | unsigned int ncores; // number of cores per cluster |
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[619] | 259 | unsigned int total_threads; // total number of threads |
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[417] | 260 | unsigned int thread_uid; // user defined thread index |
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| 261 | unsigned int main_cxy; // cluster identifier for main |
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| 262 | unsigned int main_x; // X coordinate for main thread |
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| 263 | unsigned int main_y; // Y coordinate for main thread |
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| 264 | unsigned int main_lid; // core local index for main thread |
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| 265 | unsigned int main_uid; // thread user index for main thread |
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| 266 | unsigned int x; // X coordinate for a thread |
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| 267 | unsigned int y; // Y coordinate for a thread |
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| 268 | unsigned int lid; // core local index for a thread |
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| 269 | unsigned int n; // index in array to sort |
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| 270 | pthread_t trdid; // kernel allocated thread index (unused) |
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| 271 | pthread_barrierattr_t barrier_attr; // barrier attributes |
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| 272 | |
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[623] | 273 | unsigned long long start_cycle; |
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| 274 | unsigned long long seq_end_cycle; |
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| 275 | unsigned long long para_end_cycle; |
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| 276 | |
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| 277 | ///////////////////////// |
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| 278 | get_cycle( &start_cycle ); |
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| 279 | |
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[596] | 280 | // compute number of threads (one thread per core) |
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[417] | 281 | get_config( &x_size , &y_size , &ncores ); |
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[619] | 282 | total_threads = x_size * y_size * ncores; |
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[417] | 283 | |
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| 284 | // get core coordinates and user index for the main thread |
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| 285 | get_core( &main_cxy , & main_lid ); |
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[459] | 286 | main_x = HAL_X_FROM_CXY( main_cxy ); |
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| 287 | main_y = HAL_Y_FROM_CXY( main_cxy ); |
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[417] | 288 | main_uid = (((main_x * y_size) + main_y) * ncores) + main_lid; |
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| 289 | |
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| 290 | // checks number of threads |
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[619] | 291 | if ( (total_threads != 1) && (total_threads != 2) && (total_threads != 4) && |
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| 292 | (total_threads != 8) && (total_threads != 16 ) && (total_threads != 32) && |
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| 293 | (total_threads != 64) && (total_threads != 128) && (total_threads != 256) && |
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| 294 | (total_threads != 512) && (total_threads != 1024) ) |
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[417] | 295 | { |
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[623] | 296 | printf("\n[sort error] number of cores must be power of 2\n"); |
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[434] | 297 | exit( 0 ); |
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[417] | 298 | } |
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| 299 | |
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| 300 | // check array size |
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[619] | 301 | if ( ARRAY_LENGTH % total_threads) |
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[417] | 302 | { |
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[623] | 303 | printf("\n[sort error] array size must be multiple of number of threads\n"); |
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[434] | 304 | exit( 0 ); |
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[417] | 305 | } |
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| 306 | |
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[624] | 307 | printf("\n[sort] main starts / %d threads / %d items / pid %x / cycle %d\n", |
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[623] | 308 | total_threads, ARRAY_LENGTH, getpid(), (unsigned int)start_cycle ); |
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[417] | 309 | |
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[619] | 310 | // initialize barrier |
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| 311 | if( USE_DQT_BARRIER ) |
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[417] | 312 | { |
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[619] | 313 | barrier_attr.x_size = x_size; |
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| 314 | barrier_attr.y_size = y_size; |
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| 315 | barrier_attr.nthreads = ncores; |
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| 316 | error = pthread_barrier_init( &barrier, &barrier_attr , total_threads ); |
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| 317 | } |
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| 318 | else // use SIMPLE_BARRIER |
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| 319 | { |
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| 320 | error = pthread_barrier_init( &barrier, NULL , total_threads ); |
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| 321 | } |
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| 322 | |
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| 323 | if( error ) |
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| 324 | { |
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[623] | 325 | printf("\n[sort error] cannot initialise barrier\n" ); |
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[434] | 326 | exit( 0 ); |
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[417] | 327 | } |
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| 328 | |
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[623] | 329 | #if VERBOSE |
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| 330 | printf("\n[sort] main completes barrier init\n"); |
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| 331 | #endif |
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[417] | 332 | |
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| 333 | // Array to sort initialization |
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| 334 | for ( n = 0 ; n < ARRAY_LENGTH ; n++ ) |
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| 335 | { |
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[596] | 336 | array0[n] = ARRAY_LENGTH - n - 1; |
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[417] | 337 | } |
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| 338 | |
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[623] | 339 | #if VERBOSE |
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| 340 | printf("\n[sort] main completes array init\n"); |
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[417] | 341 | #endif |
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| 342 | |
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| 343 | // launch other threads to execute sort() function |
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| 344 | // on cores other than the core running the main thread |
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| 345 | for ( x=0 ; x<x_size ; x++ ) |
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| 346 | { |
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| 347 | for ( y=0 ; y<y_size ; y++ ) |
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| 348 | { |
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| 349 | for ( lid=0 ; lid<ncores ; lid++ ) |
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| 350 | { |
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| 351 | thread_uid = (((x * y_size) + y) * ncores) + lid; |
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| 352 | |
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| 353 | // set sort arguments for all threads |
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[619] | 354 | arg[thread_uid].threads = total_threads; |
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[417] | 355 | arg[thread_uid].thread_uid = thread_uid; |
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| 356 | arg[thread_uid].main_uid = main_uid; |
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| 357 | |
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| 358 | // set thread attributes for all threads |
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[574] | 359 | attr[thread_uid].attributes = PT_ATTR_DETACH | |
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| 360 | PT_ATTR_CLUSTER_DEFINED | |
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| 361 | PT_ATTR_CORE_DEFINED; |
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[459] | 362 | attr[thread_uid].cxy = HAL_CXY_FROM_XY( x , y ); |
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[417] | 363 | attr[thread_uid].lid = lid; |
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| 364 | |
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| 365 | if( thread_uid != main_uid ) |
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| 366 | { |
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| 367 | if ( pthread_create( &trdid, // not used because no join |
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| 368 | &attr[thread_uid], // thread attributes |
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| 369 | &sort, // entry function |
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| 370 | &arg[thread_uid] ) ) // sort arguments |
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| 371 | { |
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[623] | 372 | printf("\n[sort error] main cannot create thread %x \n", thread_uid ); |
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[434] | 373 | exit( 0 ); |
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[417] | 374 | } |
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[442] | 375 | else |
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| 376 | { |
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[623] | 377 | #if VERBOSE |
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| 378 | printf("\n[sort] main created thread %x \n", thread_uid ); |
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| 379 | #endif |
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[442] | 380 | } |
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[440] | 381 | } |
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[417] | 382 | } |
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| 383 | } |
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| 384 | } |
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[442] | 385 | |
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[623] | 386 | /////////////////////////// |
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| 387 | get_cycle( &seq_end_cycle ); |
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[417] | 388 | |
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[623] | 389 | #if VERBOSE |
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| 390 | printf("\n[sort] main completes sequencial init at cycle %d\n", |
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| 391 | (unsigned int)seq_end_cycle ); |
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| 392 | #endif |
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| 393 | |
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[442] | 394 | #if INTERACTIVE_MODE |
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| 395 | idbg(); |
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| 396 | #endif |
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[441] | 397 | |
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[445] | 398 | // the main thread run also the sort() function |
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| 399 | sort( &arg[main_uid] ); |
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| 400 | |
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[623] | 401 | //////////////////////////// |
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| 402 | get_cycle( ¶_end_cycle ); |
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[619] | 403 | |
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[623] | 404 | printf("\n[sort] main completes parallel sort at cycle %d\n", |
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| 405 | (unsigned int)para_end_cycle ); |
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| 406 | |
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[619] | 407 | // destroy barrier |
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| 408 | pthread_barrier_destroy( &barrier ); |
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| 409 | |
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| 410 | #if INTERACTIVE_MODE |
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| 411 | idbg(); |
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| 412 | #endif |
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| 413 | |
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[625] | 414 | #if CHECK_RESULT |
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| 415 | |
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| 416 | int success = 1; |
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| 417 | int * res_array = ( (total_threads == 2) || |
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| 418 | (total_threads == 8) || |
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| 419 | (total_threads == 32) || |
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| 420 | (total_threads == 128) || |
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| 421 | (total_threads == 512) ) ? array1 : array0; |
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[623] | 422 | |
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[625] | 423 | for( n=0 ; n<(ARRAY_LENGTH-2) ; n++ ) |
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[417] | 424 | { |
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[625] | 425 | if ( res_array[n] > res_array[n+1] ) |
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| 426 | { |
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| 427 | printf("\n[sort] array[%d] = %d > array[%d] = %d\n", |
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| 428 | n , res_array[n] , n+1 , res_array[n+1] ); |
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| 429 | success = 0; |
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| 430 | break; |
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| 431 | } |
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[417] | 432 | } |
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| 433 | |
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[625] | 434 | if ( success ) printf("\n[sort] success\n"); |
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| 435 | else printf("\n[sort] failure\n"); |
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| 436 | |
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[417] | 437 | #endif |
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| 438 | |
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[623] | 439 | #if INSTRUMENTATION |
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[417] | 440 | |
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[625] | 441 | char name[64]; |
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| 442 | char path[128]; |
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[417] | 443 | |
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[625] | 444 | // build a file name from n_items / n_clusters / n_cores |
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| 445 | if( USE_DQT_BARRIER ) snprintf( name , 64 , "sort_dqt_%d_%d_%d", |
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| 446 | ARRAY_LENGTH, x_size * y_size, ncores ); |
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| 447 | else snprintf( name , 64 , "sort_smp_%d_%d_%d", |
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| 448 | ARRAY_LENGTH, x_size * y_size, ncores ); |
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[623] | 449 | |
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[625] | 450 | // build file pathname |
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| 451 | snprintf( path , 128 , "home/%s" , name ); |
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[623] | 452 | |
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[625] | 453 | // compute results |
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| 454 | unsigned int sequencial = (unsigned int)(seq_end_cycle - start_cycle); |
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| 455 | unsigned int parallel = (unsigned int)(para_end_cycle - seq_end_cycle); |
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[623] | 456 | |
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[625] | 457 | // display results on process terminal |
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| 458 | printf("\n----- %s -----\n" |
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| 459 | " - sequencial : %d cycles\n" |
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| 460 | " - parallel : %d cycles\n", |
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| 461 | name, sequencial, parallel ); |
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[623] | 462 | |
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[625] | 463 | // open file |
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| 464 | FILE * stream = fopen( path , NULL ); |
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| 465 | if( stream == NULL ) |
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| 466 | { |
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| 467 | printf("\n[sort error] cannot open instrumentation file <%s>\n", name ); |
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| 468 | exit(0); |
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| 469 | } |
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[623] | 470 | |
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[625] | 471 | printf("\n[sort] file %s successfully open\n", path); |
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| 472 | |
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| 473 | // register results to file |
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| 474 | int ret = fprintf( stream , "\n----- %s -----\n" |
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| 475 | " - sequencial : %d cycles\n" |
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| 476 | " - parallel : %d cycles\n", name, sequencial, parallel ); |
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| 477 | if( ret < 0 ) |
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| 478 | { |
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| 479 | printf("\n[sort error] cannot write to instrumentation file <%s>\n", name ); |
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| 480 | exit(0); |
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| 481 | } |
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| 482 | |
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| 483 | printf("\n[sort] file %s successfully written\n", path); |
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| 484 | |
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| 485 | // close instrumentation file |
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| 486 | |
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| 487 | if( fclose( stream ) ) |
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| 488 | { |
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| 489 | printf("\n[sort error] cannot close the file <%s>\n", name ); |
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| 490 | exit(0); |
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| 491 | } |
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| 492 | |
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| 493 | printf("\n[sort] file %s successfully closed\n", path); |
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| 494 | |
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[619] | 495 | #endif |
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| 496 | |
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| 497 | exit( 0 ); |
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| 498 | |
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[417] | 499 | } // end main() |
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| 500 | |
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| 501 | /* |
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| 502 | vim: tabstop=4 : shiftwidth=4 : expandtab |
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| 503 | */ |
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