Ryan Levick (rylev) (May 11 2023 at 17:06): Ryan Levick (rylev) (May 11 2023 at 17:06):I'm looking to track metrics on memory consumption from the host side. If I have a wasmtime::component::instance::Instance, is there a way to tell how much memory has been allocated in that instance?
Alex Crichton (May 11 2023 at 17:07):This can be tracked at the Store<T> level with a ResourceLimiter, but not on a more granular per-instance basis right now (although you as the embedder can probably correlate per-instance if necessary)
Ryan Levick (rylev) (May 11 2023 at 17:28):We should be fine to get the data from the store I think since we don't _really_ care about it at the instance level - we have only one instance in this case. Thanks! I'll let you know if I run into any issues
Lann Martin (May 11 2023 at 20:12):I remember looking at ResourceLimiter::memory_growing for this and thinking that it wouldn't apply to data segment initialization. Would it make sense to update the docs there?
Alex Crichton (May 11 2023 at 20:18):Indeed! It does take into account the initial growth for a memory, modeled as a growth from 0 to the requested size of the initial memory
Alex Crichton (May 11 2023 at 20:18):which should allow you to either reject it or otherwise account for it
Alex Crichton (May 11 2023 at 20:18):definitely worth updating the docs though as they're somewhat limited right now
Ryan Levick (rylev) (May 11 2023 at 20:33):One other question: is desired always guaranteed to be greater than current in ResourceLimiter::memory_growing?
Alex Crichton (May 11 2023 at 20:38):I'm pretty certain it's never less than
Alex Crichton (May 11 2023 at 20:38):I'm hesitating on saying whether it's equal-to
Alex Crichton (May 11 2023 at 20:38):I'd have to check the code, but I would say it should only ever be called when desired > current
Last updated: Nov 22 2024 at 16:03 UTC