May 2019
Intermediate to advanced
698 pages
17h 21m
English
Content preview from The Complete Rust Programming Reference Guide
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Architecture
Rust's BTreeMap chose an interesting approach to maximize performance for search by creating large individual nodes. Recalling the typical sizes of nodes (that is, the number of children they have), they were more than two (root only), or half the tree's level to the tree's level number of children. In a typical B-Tree, the level rarely exceeds 10, meaning that the nodes stay rather small, and the number of comparisons within a node do too.
The implementors of the Rust BTreeMap chose a different strategy in order to improve caching behavior. In order to improve cache-friendliness and reduce the number of heap allocations required, Rusts' BTreeMap stores from level - 1 to 2 * level - 1 number of elements per node, which results ...
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