Struct datafusion::execution::memory_pool::FairSpillPool

pub struct FairSpillPool { /* private fields */ }

A MemoryPool that prevents spillable reservations from using more than an even fraction of the available memory sans any unspillable reservations (i.e. (pool_size - unspillable_memory) / num_spillable_reservations)

┌───────────────────────z──────────────────────z───────────────┐ │ z z │ │ z z │ │ Spillable z Unspillable z Free │ │ Memory z Memory z Memory │ │ z z │ │ z z │ └───────────────────────z──────────────────────z───────────────┘

Unspillable memory is allocated in a first-come, first-serve fashion

Implementations

impl FairSpillPool

pub fn new(pool_size: usize) -> Self

Allocate up to limit bytes

Trait Implementations

impl Debug for FairSpillPool

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

Formats the value using the given formatter.

impl MemoryPool for FairSpillPool

fn register(&self, consumer: &MemoryConsumer)

Registers a new MemoryConsumer

fn unregister(&self, consumer: &MemoryConsumer)

Records the destruction of a MemoryReservation with MemoryConsumer

fn grow(&self, reservation: &MemoryReservation, additional: usize)

Infallibly grow the provided reservation by additional bytes

fn shrink(&self, reservation: &MemoryReservation, shrink: usize)

Infallibly shrink the provided reservation by shrink bytes

fn try_grow( &self, reservation: &MemoryReservation, additional: usize ) -> Result<()>

Attempt to grow the provided reservation by additional bytes

fn reserved(&self) -> usize

Return the total amount of memory reserved