Struct CopyPool 

pub struct CopyPool {

    pool: Retained<ProtocolObject<dyn MTLBuffer>>,
    _set: Retained<ProtocolObject<dyn MTLResidencySet>>,
    base: usize,
    gpu_base: u64,
    stride: usize,
    slot_stride: usize,
    slot_rec: Vec<u32>,
    slot_used: Vec<u64>,
    rec_slot: Vec<u32>,
    slot_kind: Vec<u8>,
    low_file: Option<File>,
    low_stride: usize,
    default_kind: u8,
    pub budget: usize,
}

Fields

pool: Retained<ProtocolObject<dyn MTLBuffer>>

_set: Retained<ProtocolObject<dyn MTLResidencySet>>

This set keeps the pool resident for the queue. The GPU reaches it through addresses rather than a binding.

base: usize

gpu_base: u64

stride: usize

slot_stride: usize

Bytes per slot (the low-bit stride when every record is low-bit).

slot_rec: Vec<u32>

Record id held by each slot (u32::MAX = empty).

slot_used: Vec<u64>

Step number of each slot’s last use (eviction guard and LRU key).

rec_slot: Vec<u32>

Slot of each record id (u32::MAX = not resident).

slot_kind: Vec<u8>

Store held by each slot: 0 = 4-bit record, 1 = 3-bit, 2 = 2-bit (one low-bit store is attached at a time; low_file/low_stride).

low_file: Option<File>

low_stride: usize

default_kind: u8

Kind a freshly taken slot gets (0 unless every record is low-bit).

budget: usize

Implementations

impl CopyPool

fn new( ctx: &MetalContext, stride: usize, slot_stride: usize, n_records: usize, budget: usize, ) -> Result<Self>

fn acquire(&mut self, rids: &[usize], step: u64) -> Result<Vec<usize>>