Tree Text Locality of Reference Find Timing Test

# Tree-Based Locality-of-Reference Text `find` Find Timing Test

## Description

This test inserts a number of values with keys from an arbitrary text ([ wickland96thirty ]) into a container, then performs a series of finds using `find` . It is different than Tree-Based and Trie-Based Text `find` Find Timing Test in the sequence of finds it performs: this test performs multiple `find` s on the same key before moving on to the next key. It measures the average time for `find` as a function of the number of values inserted.

(The test was executed with `tree_text_lor_find_timing_test` thirty_years_among_the_dead_preproc.txt 200 200 2100)

## Purpose

The test checks the effect of different underlying data structures in a locality-of-reference setting.

## Results

Figures NTG, NTM, and NTL show the results for the native and `pb_ds` tree-based types in g++, msvc++ and local, respectively.

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NTG: Native and tree-based locality-of-reference text find timing test using `find` - g++

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

1. ov_tree_map- `tree` with `Tag` = `ov_tree_tag` , and `Node_Update` = `null_tree_node_update`
2. rb_tree_map- `tree` with `Tag` = `rb_tree_tag` , and `Node_Update` = `null_tree_node_update`
3. n_map- `std::map`
4. splay_tree_map- `tree` with `Tag` = `splay_tree_tag` , and `Node_Update` = `null_tree_node_update`

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NTM: Native and tree-based locality-of-reference text find timing test using `find` - msvc++

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

1. ov_tree_map- `tree` with `Tag` = `ov_tree_tag` , and `Node_Update` = `null_tree_node_update`
2. rb_tree_map- `tree` with `Tag` = `rb_tree_tag` , and `Node_Update` = `null_tree_node_update`
3. n_map- `std::map`
4. splay_tree_map- `tree` with `Tag` = `splay_tree_tag` , and `Node_Update` = `null_tree_node_update`

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NTL: Native and tree-based locality-of-reference text find timing test using `find` - local

## Observations

For this setting, an ordered-vector tree ( `tree` with `Tag =` `ov_tree_tag` ), a red-black tree ( `tree` with `Tag =` `rb_tree_tag` ), and the native red-black tree all share approximately the same performance.

A splay tree ( `tree` with `Tag =` `splay_tree_tag` ) does much better, since each (successful) find "bubbles" the corresponding node to the root of the tree.

Observations::Tree-Like-Based Container Types summarizes some observations on tree-based and trie-based containers.