Struct DynamicJetArena 

pub struct DynamicJetArena { /* private fields */ }

Reusable storage for runtime-sized packed jets. Scalar primitives write into this bump arena, so arithmetic performs no heap allocation. Callers reserve once per worker/chunk and reset between rows.

Implementations

impl DynamicJetArena

pub fn new() -> Self

Create an arena with the allocator’s default initial chunk.

pub fn with_capacity(bytes: usize) -> Self

Create an arena with a row-program-selected initial byte capacity.

pub fn reset(&mut self)

Reclaim all scalar outputs and compact a fragmented high-water mark into one retained chunk.

bumpalo::Bump::reset keeps only its newest chunk and returns every older chunk to the global allocator. Runtime jet tapes routinely span several geometrically-grown chunks, so a bare reset would allocate those discarded chunks again on every row. When reset exposes that fragmentation, replace the empty arena once with a single chunk large enough for the complete prior tape. Later equal-or-smaller rows reuse that chunk without allocator traffic.

pub fn allocated_bytes(&self) -> usize

Bytes currently reserved from the global allocator. A warm-reset-warm benchmark uses this to prove the second row requires no arena growth.

pub fn alloc_slice_fill_with<T>( &self, len: usize, fill: impl FnMut(usize) -> T, ) -> &mut [T]

Allocate and initialize a runtime-sized slice in the arena. Row programs use this for their primary-scalar arrays so those arrays share the same reusable workspace as derivative channels.

Trait Implementations

impl Debug for DynamicJetArena

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

Formats the value using the given formatter.

impl Default for DynamicJetArena

fn default() -> Self

Returns the “default value” for a type.