Upgrading from v47 -> v48 results in ~40% memory use increase #295

Hi!

We recently upgraded wasmtime to v48 and noticed a large increase in memory use, roughly 40% as shown in the screenshot above. Reverting wasmtime to 47 reduced memory use to levels previously observed.

I took a look at the changelog here https://github.com/bytecodealliance/wasmtime/releases#release-v48.0.0 and the most obvious candidates (use of process_madvise, sharding added to the pooling allocator) don't seem to apply to us as we haven't enabled the pooling allocator.

Has this behaviour been observed by others? Is it expected to see an increase of this magnitude with the upgrade to v48?

Thanks!