/***** includes *****/ #include "libbenchmark_benchmarks_btree_au_internal.h" /***** structs *****/ struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element { lfds710_pal_uint_t datum; struct lfds710_btree_au_element be; }; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_thread_benchmark_state { lfds710_pal_uint_t operation_count, per_thread_prng_seed; }; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_numa_benchmark_state { lfds710_pal_uint_t *element_key_array, number_element_keys; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element *bme; struct lfds710_btree_au_state *bs; }; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_overall_benchmark_state { enum libbenchmark_topology_numa_mode numa_mode; lfds710_pal_uint_t *element_key_array, number_element_keys; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element *bme; struct lfds710_btree_au_state *bs; }; /***** private prototypes *****/ static int key_compare_function( void const *new_key, void const *existing_key ); /****************************************************************************/ void libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_init( struct libbenchmark_topology_state *ts, struct lfds710_list_aso_state *logical_processor_set, struct libshared_memory_state *ms, enum libbenchmark_topology_numa_mode numa_mode, struct libbenchmark_threadset_state *tsets ) { enum lfds710_btree_au_insert_result ir; lfds710_pal_uint_t index = 0, loop, number_logical_processors, number_benchmark_elements, number_logical_processors_in_numa_node, largest_number_logical_processors_in_numa_node = 0, total_number_benchmark_elements; struct lfds710_list_asu_element *lasue = NULL, *lasue_lp; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_overall_benchmark_state *obs; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_numa_benchmark_state *ptns; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_thread_benchmark_state *ptbs; struct lfds710_btree_au_state *bs = NULL; struct libbenchmark_prng_state ps; struct libbenchmark_threadset_per_numa_state *pns, *largest_pns = NULL; struct libbenchmark_threadset_per_thread_state *pts; struct libbenchmark_topology_node_state *numa_node_for_lp; LFDS710_PAL_ASSERT( ts != NULL ); LFDS710_PAL_ASSERT( logical_processor_set != NULL ); LFDS710_PAL_ASSERT( ms != NULL ); // TRD : numa_mode can be any value in its range LFDS710_PAL_ASSERT( tsets != NULL ); lfds710_list_aso_query( logical_processor_set, LFDS710_LIST_ASO_QUERY_GET_POTENTIALLY_INACCURATE_COUNT, NULL, (void *) &number_logical_processors ); libbenchmark_threadset_init( tsets, ts, logical_processor_set, ms, libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_thread, NULL ); total_number_benchmark_elements = number_logical_processors * 1024; obs = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_overall_benchmark_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); LIBBENCHMARK_PRNG_INIT( ps, LFDS710_PRNG_SEED ); switch( numa_mode ) { case LIBBENCHMARK_TOPOLOGY_NUMA_MODE_SMP: bs = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(struct lfds710_btree_au_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); lfds710_btree_au_init_valid_on_current_logical_core( bs, key_compare_function, LIBBENCHMARK_DATASTRUCTURE_BTREE_AU_GCC_SPINLOCK_ATOMIC_EXISTING_KEY_FAIL, NULL ); obs->bme = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element) * total_number_benchmark_elements, LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); obs->element_key_array = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(lfds710_pal_uint_t) * total_number_benchmark_elements, sizeof(lfds710_pal_uint_t) ); for( loop = 0 ; loop < total_number_benchmark_elements ; loop++ ) do { LIBBENCHMARK_PRNG_GENERATE( ps, obs->bme[loop].datum ); obs->element_key_array[loop] = obs->bme[loop].datum; LFDS710_BTREE_AU_SET_KEY_IN_ELEMENT( obs->bme[loop].be, &obs->bme[loop] ); LFDS710_BTREE_AU_SET_VALUE_IN_ELEMENT( obs->bme[loop].be, &obs->bme[loop] ); ir = lfds710_btree_au_insert( bs, &obs->bme[loop].be, NULL ); } while( ir == LFDS710_BTREE_AU_INSERT_RESULT_FAILURE_EXISTING_KEY ); lasue = NULL; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); ptbs = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_thread_benchmark_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); LIBBENCHMARK_PRNG_GENERATE( ps, ptbs->per_thread_prng_seed ); pts->users_per_thread_state = ptbs; } break; case LIBBENCHMARK_TOPOLOGY_NUMA_MODE_NUMA: while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_numa_states,lasue) ) { pns = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); lasue_lp = NULL; number_logical_processors_in_numa_node = 0; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue_lp) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue_lp ); libbenchmark_topology_query( ts, LIBBENCHMARK_TOPOLOGY_QUERY_GET_NUMA_NODE_FOR_LOGICAL_PROCESSOR, pts->tns_lp, &numa_node_for_lp ); if( LIBBENCHMARK_TOPOLOGY_NODE_GET_NUMA_ID(*numa_node_for_lp) == pns->numa_node_id ) number_logical_processors_in_numa_node++; } if( number_logical_processors_in_numa_node > largest_number_logical_processors_in_numa_node ) largest_pns = pns; } bs = libshared_memory_alloc_from_specific_node( ms, largest_pns->numa_node_id, sizeof(struct lfds710_btree_au_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); lfds710_btree_au_init_valid_on_current_logical_core( bs, key_compare_function, LFDS710_BTREE_AU_EXISTING_KEY_FAIL, NULL ); obs->element_key_array = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(lfds710_pal_uint_t) * total_number_benchmark_elements, sizeof(lfds710_pal_uint_t) ); lasue = NULL; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_numa_states,lasue) ) { pns = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); /* TRD : for each NUMA node, figure out how many LPs in the current set are in that NUMA node and allocate then the correct number of elements from this NUMA node (1024 per LP) */ lasue_lp = NULL; number_logical_processors_in_numa_node = 0; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue_lp) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue_lp ); libbenchmark_topology_query( ts, LIBBENCHMARK_TOPOLOGY_QUERY_GET_NUMA_NODE_FOR_LOGICAL_PROCESSOR, pts->tns_lp, &numa_node_for_lp ); if( LIBBENCHMARK_TOPOLOGY_NODE_GET_NUMA_ID(*numa_node_for_lp) == pns->numa_node_id ) number_logical_processors_in_numa_node++; } number_benchmark_elements = number_logical_processors_in_numa_node * 1024; ptns = libshared_memory_alloc_from_specific_node( ms, pns->numa_node_id, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_numa_benchmark_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); ptns->element_key_array = libshared_memory_alloc_from_specific_node( ms, pns->numa_node_id, sizeof(lfds710_pal_uint_t) * total_number_benchmark_elements, sizeof(lfds710_pal_uint_t) ); ptns->number_element_keys = total_number_benchmark_elements; ptns->bme = libshared_memory_alloc_from_specific_node( ms, pns->numa_node_id, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element) * number_benchmark_elements, LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); for( loop = 0 ; loop < number_benchmark_elements ; loop++, index++ ) do { LIBBENCHMARK_PRNG_GENERATE( ps, ptns->bme[loop].datum ); obs->element_key_array[index] = ptns->bme[loop].datum; LFDS710_BTREE_AU_SET_KEY_IN_ELEMENT( ptns->bme[loop].be, &ptns->bme[loop] ); LFDS710_BTREE_AU_SET_VALUE_IN_ELEMENT( ptns->bme[loop].be, &ptns->bme[loop] ); ir = lfds710_btree_au_insert( bs, &ptns->bme[loop].be, NULL ); } while( ir == LFDS710_BTREE_AU_INSERT_RESULT_FAILURE_EXISTING_KEY ); pns->users_per_numa_state = ptns; } // TRD : now copy over into each NUMA node state the element_key_array lasue = NULL; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_numa_states,lasue) ) { pns = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); ptns = pns->users_per_numa_state; for( loop = 0 ; loop < total_number_benchmark_elements ; loop++ ) ptns->element_key_array[loop] = obs->element_key_array[loop]; } lasue = NULL; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); ptbs = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_thread_benchmark_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); LIBBENCHMARK_PRNG_GENERATE( ps, ptbs->per_thread_prng_seed ); LIBBENCHMARK_PRNG_MURMURHASH3_MIXING_FUNCTION( ptbs->per_thread_prng_seed ); pts->users_per_thread_state = ptbs; } break; case LIBBENCHMARK_TOPOLOGY_NUMA_MODE_NUMA_BUT_NOT_USED: while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_numa_states,lasue) ) { pns = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); lasue_lp = NULL; number_logical_processors_in_numa_node = 0; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue_lp) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue_lp ); libbenchmark_topology_query( ts, LIBBENCHMARK_TOPOLOGY_QUERY_GET_NUMA_NODE_FOR_LOGICAL_PROCESSOR, pts->tns_lp, &numa_node_for_lp ); if( LIBBENCHMARK_TOPOLOGY_NODE_GET_NUMA_ID(*numa_node_for_lp) == pns->numa_node_id ) number_logical_processors_in_numa_node++; } if( number_logical_processors_in_numa_node > largest_number_logical_processors_in_numa_node ) largest_pns = pns; } bs = libshared_memory_alloc_from_specific_node( ms, largest_pns->numa_node_id, sizeof(struct lfds710_btree_au_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); lfds710_btree_au_init_valid_on_current_logical_core( bs, key_compare_function, LFDS710_BTREE_AU_EXISTING_KEY_FAIL, NULL ); obs->element_key_array = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(lfds710_pal_uint_t) * total_number_benchmark_elements, sizeof(lfds710_pal_uint_t) ); lasue = NULL; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_numa_states,lasue) ) { pns = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); /* TRD : for each NUMA node, figure out how many LPs in the current set are in that NUMA node and allocate then the correct number of elements from this NUMA node (1024 per LP) */ lasue_lp = NULL; number_logical_processors_in_numa_node = 0; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue_lp) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue_lp ); libbenchmark_topology_query( ts, LIBBENCHMARK_TOPOLOGY_QUERY_GET_NUMA_NODE_FOR_LOGICAL_PROCESSOR, pts->tns_lp, &numa_node_for_lp ); if( LIBBENCHMARK_TOPOLOGY_NODE_GET_NUMA_ID(*numa_node_for_lp) == pns->numa_node_id ) number_logical_processors_in_numa_node++; } number_benchmark_elements = number_logical_processors_in_numa_node * 1024; ptns = libshared_memory_alloc_from_specific_node( ms, pns->numa_node_id, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_numa_benchmark_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); ptns->element_key_array = libshared_memory_alloc_from_specific_node( ms, pns->numa_node_id, sizeof(lfds710_pal_uint_t) * total_number_benchmark_elements, sizeof(lfds710_pal_uint_t) ); ptns->number_element_keys = total_number_benchmark_elements; // TRD : everyone stores their elements in the same NUMA node ptns->bme = libshared_memory_alloc_from_specific_node( ms, largest_pns->numa_node_id, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element) * number_benchmark_elements, LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); for( loop = 0 ; loop < number_benchmark_elements ; loop++, index++ ) do { LIBBENCHMARK_PRNG_GENERATE( ps, ptns->bme[loop].datum ); obs->element_key_array[index] = ptns->bme[loop].datum; LFDS710_BTREE_AU_SET_KEY_IN_ELEMENT( ptns->bme[loop].be, &ptns->bme[loop] ); LFDS710_BTREE_AU_SET_VALUE_IN_ELEMENT( ptns->bme[loop].be, &ptns->bme[loop] ); ir = lfds710_btree_au_insert( bs, &ptns->bme[loop].be, NULL ); } while( ir == LFDS710_BTREE_AU_INSERT_RESULT_FAILURE_EXISTING_KEY ); pns->users_per_numa_state = ptns; } // TRD : now copy over into each NUMA node state the element_key_array lasue = NULL; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_numa_states,lasue) ) { pns = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); ptns = pns->users_per_numa_state; for( loop = 0 ; loop < total_number_benchmark_elements ; loop++ ) ptns->element_key_array[loop] = obs->element_key_array[loop]; } lasue = NULL; while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); ptbs = libshared_memory_alloc_from_most_free_space_node( ms, sizeof(struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_thread_benchmark_state), LFDS710_PAL_ATOMIC_ISOLATION_IN_BYTES ); LIBBENCHMARK_PRNG_GENERATE( ps, ptbs->per_thread_prng_seed ); LIBBENCHMARK_PRNG_MURMURHASH3_MIXING_FUNCTION( ptbs->per_thread_prng_seed ); pts->users_per_thread_state = ptbs; } break; } obs->number_element_keys = total_number_benchmark_elements; obs->bs = bs; obs->numa_mode = numa_mode; tsets->users_threadset_state = obs; return; } /****************************************************************************/ libshared_pal_thread_return_t LIBSHARED_PAL_THREAD_CALLING_CONVENTION libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_thread( void *libbenchmark_threadset_per_thread_state ) { int long long unsigned current_time = 0, end_time, time_units_per_second; lfds710_pal_uint_t *element_key_array = NULL, index, number_element_keys = 0, operation_count = 0, random_value, time_loop = 0; struct libbenchmark_prng_state ps; struct lfds710_btree_au_element *existing_be; struct lfds710_btree_au_state *bs; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_thread_benchmark_state *ptbs; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_numa_benchmark_state *pnbs = NULL; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_overall_benchmark_state *obs; struct libbenchmark_threadset_per_thread_state *pts; LFDS710_MISC_BARRIER_LOAD; LFDS710_PAL_ASSERT( libbenchmark_threadset_per_thread_state != NULL ); pts = (struct libbenchmark_threadset_per_thread_state *) libbenchmark_threadset_per_thread_state; ptbs = LIBBENCHMARK_THREADSET_PER_THREAD_STATE_GET_USERS_PER_THREAD_STATE( *pts ); obs = LIBBENCHMARK_THREADSET_PER_THREAD_STATE_GET_USERS_OVERALL_STATE( *pts ); if( obs->numa_mode == LIBBENCHMARK_TOPOLOGY_NUMA_MODE_NUMA or obs->numa_mode == LIBBENCHMARK_TOPOLOGY_NUMA_MODE_NUMA_BUT_NOT_USED ) pnbs = LIBBENCHMARK_THREADSET_PER_THREAD_STATE_GET_USERS_PER_NUMA_STATE( *pts ); bs = obs->bs; LIBBENCHMARK_PRNG_INIT( ps, ptbs->per_thread_prng_seed ); LIBBENCHMARK_PAL_TIME_UNITS_PER_SECOND( &time_units_per_second ); switch( obs->numa_mode ) { case LIBBENCHMARK_TOPOLOGY_NUMA_MODE_SMP: element_key_array = obs->element_key_array; number_element_keys = obs->number_element_keys; break; case LIBBENCHMARK_TOPOLOGY_NUMA_MODE_NUMA: element_key_array = pnbs->element_key_array; number_element_keys = pnbs->number_element_keys; break; case LIBBENCHMARK_TOPOLOGY_NUMA_MODE_NUMA_BUT_NOT_USED: element_key_array = pnbs->element_key_array; number_element_keys = pnbs->number_element_keys; break; } libbenchmark_threadset_thread_ready_and_wait( pts ); LIBBENCHMARK_PAL_GET_HIGHRES_TIME( ¤t_time ); end_time = current_time + time_units_per_second * libbenchmark_globals_benchmark_duration_in_seconds; while( current_time < end_time ) { LIBBENCHMARK_PRNG_GENERATE( ps, random_value ); index = random_value % number_element_keys; // TRD : read lfds710_btree_au_get_by_key( bs, NULL, &element_key_array[index], &existing_be ); // LFDS710_BTREE_AU_GET_VALUE_FROM_ELEMENT( benchmark_state->bs, *existing_be, datum ); LIBBENCHMARK_PRNG_GENERATE( ps, random_value ); index = random_value % number_element_keys; // TRD : write lfds710_btree_au_get_by_key( bs, NULL, &element_key_array[index], &existing_be ); // LFDS710_BTREE_AU_SET_VALUE_IN_ELEMENT( benchmark_state->bs, *existing_be, benchmark_state->benchmark_element_array[index].datum ); operation_count++; if( time_loop++ == TIME_LOOP_COUNT ) { time_loop = 0; LIBBENCHMARK_PAL_GET_HIGHRES_TIME( ¤t_time ); } } ptbs->operation_count = operation_count; LFDS710_MISC_BARRIER_STORE; lfds710_misc_force_store(); return LIBSHARED_PAL_THREAD_RETURN_CAST(RETURN_SUCCESS); } /****************************************************************************/ void libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_cleanup( struct lfds710_list_aso_state *logical_processor_set, enum libbenchmark_topology_numa_mode numa_mode, struct libbenchmark_results_state *rs, struct libbenchmark_threadset_state *tsets ) { struct lfds710_list_asu_element *lasue = NULL; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_overall_benchmark_state *obs; struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_per_thread_benchmark_state *ptbs; struct libbenchmark_threadset_per_thread_state *pts; LFDS710_PAL_ASSERT( logical_processor_set != NULL ); // TRD : numa_mode can be any value in its range LFDS710_PAL_ASSERT( rs != NULL ); LFDS710_PAL_ASSERT( tsets != NULL ); while( LFDS710_LIST_ASU_GET_START_AND_THEN_NEXT(tsets->list_of_per_thread_states,lasue) ) { pts = LFDS710_LIST_ASU_GET_VALUE_FROM_ELEMENT( *lasue ); ptbs = LIBBENCHMARK_THREADSET_PER_THREAD_STATE_GET_USERS_PER_THREAD_STATE( *pts ); libbenchmark_results_put_result( rs, LIBBENCHMARK_DATASTRUCTURE_ID_BTREE_AU, LIBBENCHMARK_BENCHMARK_ID_READN_THEN_WRITEN, LIBBENCHMARK_LOCK_ID_LIBLFDS710_LOCKFREE, numa_mode, logical_processor_set, LIBBENCHMARK_TOPOLOGY_NODE_GET_LOGICAL_PROCESSOR_NUMBER( *pts->tns_lp ), LIBBENCHMARK_TOPOLOGY_NODE_GET_WINDOWS_GROUP_NUMBER( *pts->tns_lp ), ptbs->operation_count ); } obs = tsets->users_threadset_state;; lfds710_btree_au_cleanup( obs->bs, NULL ); return; } /****************************************************************************/ static int key_compare_function( void const *new_key, void const *existing_key ) { struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element *new_benchmark_element, *existing_benchmark_element; LFDS710_PAL_ASSERT( new_key != NULL ); LFDS710_PAL_ASSERT( existing_key != NULL ); new_benchmark_element = (struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element *) new_key; existing_benchmark_element = (struct libbenchmark_benchmark_btree_au_liblfds710_lockfree_readn_writen_benchmark_element *) existing_key; if( new_benchmark_element->datum < existing_benchmark_element->datum ) return -1; if( new_benchmark_element->datum > existing_benchmark_element->datum ) return 1; return 0; }