1 /** 2 * @file db_stat.c 3 * Statistics routines for libdb 4 * 5 * @remark Copyright 2002 OProfile authors 6 * @remark Read the file COPYING 7 * 8 * @author Philippe Elie 9 */ 10 11 #include <stdlib.h> 12 #include <stdio.h> 13 14 #include "odb.h" 15 #include "op_types.h" 16 17 /// hold various statistics data for a db file 18 struct odb_hash_stat_t { 19 odb_node_nr_t node_nr; /**< allocated node number */ 20 odb_node_nr_t used_node_nr; /**< in use node number */ 21 count_type total_count; /**< cumulated samples count */ 22 odb_index_t hash_table_size; /**< hash table entry number */ 23 odb_node_nr_t max_list_length; /**< worst case */ 24 double average_list_length; /**< average case */ 25 /* do we need variance ? */ 26 }; 27 28 odb_hash_stat_t * odb_hash_stat(odb_t const * odb) 29 { 30 size_t max_length = 0; 31 double total_length = 0.0; 32 size_t nr_non_empty_list = 0; 33 size_t pos; 34 odb_data_t * data = odb->data; 35 36 odb_hash_stat_t * result = calloc(1, sizeof(odb_hash_stat_t)); 37 if (!result) { 38 fprintf(stderr, "not enough memory\n"); 39 exit(EXIT_FAILURE); 40 } 41 42 result->node_nr = data->descr->size; 43 result->used_node_nr = data->descr->current_size; 44 result->hash_table_size = data->descr->size * BUCKET_FACTOR; 45 46 /* FIXME: I'm dubious if this do right statistics for hash table 47 * efficiency check */ 48 49 for (pos = 0 ; pos < result->hash_table_size ; ++pos) { 50 size_t cur_length = 0; 51 size_t index = data->hash_base[pos]; 52 while (index) { 53 result->total_count += data->node_base[index].value; 54 index = data->node_base[index].next; 55 ++cur_length; 56 } 57 58 if (cur_length > max_length) 59 max_length = cur_length; 60 61 if (cur_length) { 62 total_length += cur_length; 63 ++nr_non_empty_list; 64 } 65 } 66 67 result->max_list_length = max_length; 68 result->average_list_length = total_length / nr_non_empty_list; 69 70 return result; 71 } 72 73 74 void odb_hash_display_stat(odb_hash_stat_t const * stat) 75 { 76 printf("total node number: %d\n", stat->node_nr); 77 printf("total used node: %d\n", stat->used_node_nr); 78 printf("total count: %llu\n", stat->total_count); 79 printf("hash table size: %d\n", stat->hash_table_size); 80 printf("greater list length: %d\n", stat->max_list_length); 81 printf("average non empty list length: %2.4f\n", stat->average_list_length); 82 } 83 84 85 void odb_hash_free_stat(odb_hash_stat_t * stat) 86 { 87 free(stat); 88 } 89
