Struct KvTuning 

pub struct KvTuning {
    pub default_capacity: usize,
    pub rehash_load_factor: f32,
    pub rehash_batch_size: usize,
    pub default_inline_threshold: usize,
    pub expiry_reap_budget: usize,
    pub expiry_tick_ms: u64,
}

KV engine tuning (hash table, expiry wheel, slab allocator).

Controls the per-core hash table parameters, incremental rehash behavior, expiry wheel tick rate, and the per-tick reap budget that prevents reactor stalls during mass-expiry events.

Fields

default_capacity: usize

Default initial hash table capacity per collection (number of slots). Should be a power of two. Larger values reduce early rehash churn for collections that will grow quickly. Default: 16384.

rehash_load_factor: f32

Hash table load factor threshold that triggers incremental rehash. When entries / capacity > rehash_load_factor, the table begins doubling. Range: 0.5–0.9. Default: 0.75 (standard Robin Hood threshold).

rehash_batch_size: usize

Number of entries rehashed per PUT during incremental rehash. Higher values complete rehash faster but add per-PUT latency. Default: 8.

default_inline_threshold: usize

Default inline value threshold in bytes. Values at or below this size are stored directly in the hash entry (no pointer chase). Larger values overflow to slab-allocated Binary Tuples. Default: 64.

expiry_reap_budget: usize

Maximum expirations processed per reactor tick (event loop iteration). Prevents mass-expiry events (e.g., 10M keys with identical TTL) from stalling the TPC core. Expired-but-not-yet-reaped keys are invisible to GET (lazy fallback). Default: 1024.

expiry_tick_ms: u64

Expiry wheel tick interval in milliseconds. Determines the granularity of TTL expiration. Lower = more precise but more CPU overhead. Default: 1000 (1 second).

Trait Implementations

impl Clone for KvTuning

fn clone(&self) -> KvTuning

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for KvTuning

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for KvTuning

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for KvTuning

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for KvTuning

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.