# Hash-Based Random-Integer `operator[]` FindTiming Test

## Description

This test inserts a number of values with uniform i.i.d. integer keys into a container, then performs a series of finds using `operator[]`. It measures the average time for `operator[]` as a function of the number of values inserted.

(The test was executed with `hash_random_int_subscript_find_timing_test` 200 200 2100)

## Purpose

The test checks the effect of different underlying hash-tables (see Design::Hash-Based Containers ), range-hashing functions, and trigger policies (see Design::Hash-Based Containers::Hash Policies and Design::Hash-Based Containers::Resize Policies ).

## Results

Figures NCCG, NCCM, and NCCL show the results for the native and collision-chaining types in g++, MSVC++, and local, respectively; Figures NGPG, NGPM, and NGPL show the results for the native and probing types in g++, MSVC++, and local, respectively.

######

NCCG: Native and collision-chaining hash random int find timing test using `operator`[] - g++

In the above figure, the names in the legends have the following meaning:

1. n_hash_map_ncah- `std::tr1::unordered_map` with `cache_hash_code` = `false`
2. cc_hash_mod_prime_nea_lc_1div8_1div1_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mod_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_prime_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/1
3. cc_hash_mod_prime_nea_lc_1div8_1div2_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mod_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_prime_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2
4. cc_hash_mask_exp_nea_lc_1div8_1div1_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mask_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_exponential_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/1
5. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mask_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_exponential_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2

######

NCCM: Native and collision-chaining hash random int find timing test using `operator`[] - msvc++

In the above figure, the names in the legends have the following meaning:

1. cc_hash_mod_prime_nea_lc_1div8_1div1_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mod_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_prime_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/1
2. cc_hash_mod_prime_nea_lc_1div8_1div2_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mod_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_prime_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2
3. n_hash_map_ncah- `stdext::hash_map`
4. cc_hash_mask_exp_nea_lc_1div8_1div1_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mask_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_exponential_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/1
5. cc_hash_mask_exp_nea_lc_1div8_1div2_nsth_map- `cc_hash_table` with `Comb_Hash_Fn` = `direct_mask_range_hashing` , and `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_exponential_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2

######

NCCL: Native and collision-chaining hash random int find timing test using `operator`[] - local

######

NGPG: Native and probing hash random int find timing test using `operator`[] - g++

In the above figure, the names in the legends have the following meaning:

1. n_hash_map_ncah- `std::tr1::unordered_map` with `cache_hash_code` = `false`
2. gp_hash_mod_quadp_prime_nea_lc_1div8_1div2_nsth_map- `gp_hash_table` with `Comb_Hash_Fn` = `direct_mod_range_hashing` , `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_prime_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2, and `Probe_Fn` = `quadratic_probe_fn`
3. gp_hash_mask_linp_exp_nea_lc_1div8_1div2_nsth_map- `gp_hash_table` with `Comb_Hash_Fn` = `direct_mask_range_hashing` , `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_exponential_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2, and `Probe_Fn` = `linear_probe_fn`

######

NGPM: Native and probing hash random int find timing test using `operator`[] - msvc++

In the above figure, the names in the legends have the following meaning:

1. gp_hash_mod_quadp_prime_nea_lc_1div8_1div2_nsth_map- `gp_hash_table` with `Comb_Hash_Fn` = `direct_mod_range_hashing` , `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_prime_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2, and `Probe_Fn` = `quadratic_probe_fn`
2. n_hash_map_ncah- `stdext::hash_map`
3. gp_hash_mask_linp_exp_nea_lc_1div8_1div2_nsth_map- `gp_hash_table` with `Comb_Hash_Fn` = `direct_mask_range_hashing` , `Resize_Policy` = `hash_standard_resize_policy` with `Size_Policy` = `hash_exponential_size_policy` , and `Trigger_Policy` = `hash_load_check_resize_trigger` with αmin = 1/8 and αmax = 1/2, and `Probe_Fn` = `linear_probe_fn`

######

NGPL: Native and probing hash random int find timing test using `operator`[] - local

## Observations

This test shows similar results to Hash-Based Random-Integer `find` Find Timing Test .