Struct Cache 

pub struct Cache { /* private fields */ }

Cache, in which blocks or blobs are cached in-memory after being retrieved from disk

This speeds up consecutive queries to nearby data, improving read performance for hot data.

Examples

Sharing cache between multiple trees

// Provide 64 MB of cache capacity
let cache = Arc::new(Cache::with_capacity_bytes(64 * 1_000 * 1_000));

let tree1 = Config::new(folder, Default::default(), Default::default()).use_cache(cache.clone()).open()?;
let tree2 = Config::new(folder, Default::default(), Default::default()).use_cache(cache.clone()).open()?;

Implementations

impl Cache

pub fn with_capacity_bytes(bytes: u64) -> Self

Creates a new block cache with roughly n bytes of capacity.

pub fn size(&self) -> u64

Returns the amount of cached bytes.

pub fn capacity(&self) -> u64

Returns the cache capacity in bytes.