Enum MemoryBackend 

pub enum MemoryBackend {
    UnifiedBuffer,
    PoolingMpk {
        max_memories: u32,
        memory_bytes: usize,
    },
}

Selects the linear-memory backing strategy for the engine.

The two modes are mutually exclusive at the Wasmtime level: with_host_memory (used by MemoryBackend::UnifiedBuffer) cannot coexist with the pooling allocator (required by MemoryBackend::PoolingMpk). Operators pick the mode that fits their workload.

Variants

UnifiedBuffer

Host-provided UnifiedBuffer-backed linear memory via with_host_memory. Required for the GPU integration path (kernels read/write the same allocation the Wasm guest sees). DOES NOT support MPK — Wasmtime’s pooling+MPK machinery is mutually exclusive with custom MemoryCreator.

PoolingMpk

Wasmtime’s pooling allocator with MPK (memory protection keys). Trades the GPU integration path for intra-process Wasm isolation via CPU PKU. Suitable for CPU-only or batch-GPU workloads where kernel launches don’t share memory with Wasm at byte level.

Fields

max_memories: u32

Maximum total memories tracked by the pooling allocator.

memory_bytes: usize

Bytes per memory slot.

Trait Implementations

impl Clone for MemoryBackend

fn clone(&self) -> MemoryBackend

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MemoryBackend

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

Formats the value using the given formatter.

impl Default for MemoryBackend

fn default() -> MemoryBackend

Returns the “default value” for a type.