Struct CMSketchAtomicU8 

pub struct CMSketchAtomicU8 { /* private fields */ }

Count-Min Sketch that stores u8 counters using atomics for concurrent updates.

Each bucket is backed by AtomicU8, allowing lock-free increments and decrements.

Implementations

impl CMSketchAtomicU8

pub fn new(eps: f64, confidence: f64) -> Self

Creates a new atomic sketch sized by error eps and confidence.

See CMSketchU32::new for the mapping between confidence and depth.

Panics

Panics if eps <= 0.0 or confidence <= 0.0.

pub fn inc(&self, hash: u64)

Atomically increments the count associated with hash by 1.

pub fn inc_by(&self, hash: u64, count: u8)

Atomically increments the count associated with hash by count.

Saturates at the maximum value representable by the counter type and leaves the bucket unchanged if the update would overflow.

pub fn dec(&self, hash: u64)

Atomically decrements the count associated with hash by 1.

pub fn dec_by(&self, hash: u64, count: u8)

Atomically decrements the count associated with hash by count.

Leaves the counter unchanged if it would underflow.

pub fn estimate(&self, hash: u64) -> u8

Returns the minimum counter across all rows for hash.

pub fn clear(&self)

Resets all counters to zero.

pub fn halve(&self)

Divides every counter by two using an atomic fetch-update.

pub fn decay(&self, decay: f64)

Applies a floating-point decay factor to every counter.

pub fn width(&self) -> usize

Returns the configured table width (number of columns).

pub fn depth(&self) -> usize

Returns the number of hash rows.

pub fn capacity(&self) -> u8

Returns the maximum representable counter for this sketch.

pub fn memory(&self) -> usize

Returns the amount of memory used by the sketch in bytes.

Trait Implementations

impl Debug for CMSketchAtomicU8

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

Formats the value using the given formatter.