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This policy attempts to reuse the same instance slot for subsequent instantiations of the same module. This is particularly useful when using a pooling backend such as memfd that benefits from this reuse: for example, in the memfd case, instantiating the same module into the same slot allows us to avoid several calls to mmap() because the same mappings can be reused. The policy tracks a freelist per "compiled module ID", and when allocating a slot for an instance, tries these three options in order: 1. A slot from the freelist for this module (i.e., last used for another instantiation of this particular module), or 3. A slot that was last used by some other module or never before. The "victim" slot for choice 2 is randomly chosen. The data structures are carefully designed so that all updates are O(1), and there is no retry-loop in any of the random selection. This policy is now the default when the memfd backend is selected via the `memfd-allocator` feature flag.
Wasmtime Embedding API
The wasmtime crate is an embedding API of the wasmtime WebAssembly runtime.
This is intended to be used in Rust projects and provides a high-level API of
working with WebAssembly modules.
If you're interested in embedding wasmtime in other languages, you may wish to
take a look a the C embedding API instead!