Fine grain control over fuel consumption based on wasm opera · wasmtime

Stream: wasmtime

Topic: Fine grain control over fuel consumption based on wasm opera

Demilade Sonuga (Feb 06 2026 at 11:32):

Hi,

I need to be able to specify different custom fuel costs for wasm operators.
I see that there is already an issue for this here but it seems like there has been no progress on it since last year August.

I don't know if maybe for some reason it's been decided that perhaps it's not a good idea, or something that should be done, but if that's not the case, I'd like to take a try at it to open a PR.

Would like to hear any thoughts, maybe there's some bigger picture I'm missing out on here, or maybe this use-case is already possible through some other means.

Fine grain control over fuel consumption based on wasm operator · Issue #11572 · bytecodealliance/wasmtime

We're hoping to migrate from wasmer to wasmtime but we need fine grained control over fuel consumption based on a per wasm operator usage pattern. In wasmer we can set a tunable cost function and t...

Alex Crichton (Feb 06 2026 at 15:45):

My impression is that the work just hasn't been done yet, but the feature itself is still reasonable to add.

Last updated: Feb 24 2026 at 04:36 UTC