Go pprof

What Go pprof is

Go pprof is a free, self-hosted profiling package and analysis tool for Go programs. The runtime/pprof package writes runtime data in a format the pprof visualizer understands, while Go benchmarks can produce CPU and memory profiles through go test flags. The net/http/pprof package exposes live profiles under /debug/pprof/ and serves execution traces for go tool trace. Predefined profiles cover goroutines, goroutine leaks, allocations, heap, thread creation, blocking, and mutex contention. CPU profiling uses StartCPUProfile and StopCPUProfile, writing buffered output to an io.Writer. The go tool pprof command can summarize hot spots and open an interactive graph of hot spots and call graphs. Profile.WriteTo supports gzip-compressed protocol buffers or legacy text containing function names and line numbers. Labels can be attached to contexts and goroutines, although only CPU and goroutine profiles currently use them. Custom named profiles can track resources such as files or network connections. The package is licensed under BSD-3-Clause. Profile quality depends on kernel support, and Unix-like c-archive or c-shared builds have a stated CPU-profiling limitation.