Go's Execution Tracer: A Ring Buffer of Events Per Goroutine
Unlike pprof, the execution tracer records every event: goroutine starts, stops, blocks, syscalls and GC phases are batched per M, deduplicated through lock-free hash tries, and …
Profiling
How Go's CPU Profiler Works: SIGPROF, the Signal Stack and 100 Hz Sampling
A 100 Hz setitimer(ITIMER_PROF) raises SIGPROF, the handler runs on the gsignal stack, unwinds the running goroutine, and writes samples into a lock-free profBuf ring that …