Workers profiling

Find expensive functions or memory allocations in deployed code and come up with ways to fix them.

Retrieve the docs

Start with the production profiling guide to understand how Workers and Durable Objects profiling works.

Profiling steps

1. Identify the symptom and affected workload: CPU usage, latency, allocation pressure, or memory growth.
2. Confirm the account, Worker, environment, and deployed version with the user.
3. For a Durable Object, also confirm its owning Worker, namespace, and instance.
4. Choose CPU or heap profiling from the current guide's supported types and meanings.

Where possible, use the cf CLI to capture profiles. If the user requests cf, inspect the installed version's command help and schema where available.

If cf isn't available, consider prompting the user whether they would like to install it.