How to call functions concurrently

[sagacity]

Hello, is there any reasonable way to call an exported TypedFunction across multiple threads (or Tokio tasks)? I have some stateless functions in WASM that I'd like to call simultaneously to serve requests.

Concurrent invocations of any TypedFunction currently does not seem possible since the first argument for TypedFunction::call is a mutable Store, and we can't have multiple mutable references to that store at the same time. I saw that Instance is cheap to clone, but it refers to an underlying Store which cannot be cloned.

As a workaround I can also create a pool of Wasmer Instances and use those, but then I'm limiting the amount of concurrency I have.

I appreciate this behaviour must be by design to prevent incorrect multithreaded usage, but I'm not sure really sure what my options are right now.

Any ideas?

[sagacity]

Answered on Slack by @Michael-F-Bryan: It's fine to create a new Instance and Store per request. If you keep the Module around across calls (which contains the compiled WASM), it should be very cheap to do so.