# Description of Changes
With this PR, all `VmMetrics` for all the reducers and views of a module
are made in `InstanceCommon::new`
so that they are never made in `call_{reducer/view}_with_tx`.
Here's a flamegraph before this PR, zooming in on the smaller
`call_reducer_with_tx`
<img width="1877" height="617" alt="image"
src="https://github.com/user-attachments/assets/9751c066-2bf0-4ded-a091-afa7d3b5dd75"
/>
And after, for the same `call_reducer_with_tx`:
<img width="1883" height="610" alt="image"
src="https://github.com/user-attachments/assets/27083acd-d4c9-4b69-94c7-c26c7f1e7cef"
/>
Here are the performance numbers:
```
wasm, index=hash, branch=master, commit = af4d3f39e4
ran for 10.097515999 seconds
completed 1310720
throughput was 129806.18204812016 TPS
wasm, index=hash, branch=master, commit = bac3d2a5a928af896d315fcfdf709d42e3577b66
ran for 10.842949063 seconds
completed 1474560
throughput was 135992.52301495385 TPS
```
As you can see, this is a gain of about 6k TPS on the phoenix_nap
machine.
The second commit also adds the `d3-flamegraph-base.html` and stuff to
`.gitignore` to facilitate taking flamegraphs.
# API and ABI breaking changes
None
# Expected complexity level and risk
1, trivial changes that are not load bearing.
Mazdak Farrokhzad