Struct MemoryManager 

pub struct MemoryManager { /* private fields */ }

A memory tracker for the database instance.

In addition to a flat total_allocated counter, the manager routes every allocation through a MemoryAccountant so the same budget can be broken down by subsystem (buffer pool, indexes, graphs) and used to derive an effective spill threshold for the memory governor.

Implementations

impl MemoryManager

pub fn new(max_memory: u64) -> Self

pub fn max_memory(&self) -> u64

pub fn total_allocated(&self) -> u64

pub fn allocate(&self, amount: u64)

Allocate amount bytes attributed to MemoryAccountingClass::Other.

Kept for callers that do not care about attribution; prefer MemoryManager::allocate_with.

pub fn allocate_with(&self, attr: MemoryAttribution, amount: u64)

Allocate amount bytes attributed to attr (accountable allocation).

pub fn deallocate(&self, amount: u64)

Release amount bytes (unattributed). Prefer MemoryManager::deallocate_with to keep per-class books balanced.

pub fn deallocate_with(&self, attr: MemoryAttribution, amount: u64)

Release amount bytes previously attributed to attr.

pub fn is_under_limit(&self) -> bool

pub fn accountant(&self) -> &MemoryAccountant

The accountant backing this manager (live totals break down by class).

pub fn effective_spill_threshold(&self) -> u64

Headroom left before the configured budget is exhausted.

Intended to be read by the spiller when deciding whether a NodeGroup / frame batch crosses the spill threshold: “how much can I still grow?”.

pub fn memory_pressure(&self) -> f64

Fraction of the configured budget currently allocated, in 0.0..=1.0.

pub fn is_under_memory_pressure(&self, ratio: f64) -> bool

True when allocated memory consumes at least ratio of the budget.

Trait Implementations

impl Debug for MemoryManager

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

Formats the value using the given formatter.

impl Default for MemoryManager

fn default() -> Self

Returns the “default value” for a type.