Debug the Mercure.rocks Hub

The hub is shipped with pprof, a profiler that helps you find bottlenecks, memory leaks, and blocked goroutines, among other things.

To enable the profiler, add the debug global directive to your Caddyfile:

{
  debug
}

# ...

If you use the default Caddyfile, you can also set the GLOBAL_OPTIONS environment variable to debug.

The route exposing profiling data is now available at http://localhost:2019/debug/pprof/. You can use the pprof tool to visualize this data.

Examples

View the heap profile:

go tool pprof -http=:8080 http://localhost:2019/debug/pprof/heap

View past memory allocations:

go tool pprof -http=:8080 http://localhost:2019/debug/pprof/allocs

See http://localhost:2019/debug/pprof/ for the full list of available data.