cranelift/docs/examples-profiling-guest.md

Using Wasmtime's cross-platform profiler

The guest profiling strategy enables in-process sampling and will write the captured profile to a file which can be viewed at https://profiler.firefox.com/.

To use this profiler with the Wasmtime CLI, pass the --profile=guest[,path[,interval]] flag.

• path is where to write the profile, wasmtime-guest-profile.json by default
• interval is the duration between samples, 10ms by default

When used with -W timeout=N, the timeout will be rounded up to the nearest multiple of the profiling interval.