Cross Profiler __exclusive__ — Offline

type RingRecorder struct buffer []Event head atomic.Uint64 fd *os.File compressor *snappy.Writer

func (r *RingRecorder) Record(domain string, key string, value uint64) idx := r.head.Add(1) % uint64(len(r.buffer)) e := &r.buffer[idx] e.Ts = uint64(time.Now().UnixNano()) e.Domain = domain e.Key = key e.Value = value // Capture stack (omit for brevity) offline cross profiler

func (r *RingRecorder) flush() // Snappy compress and write to offline file // No analysis happens here. type RingRecorder struct buffer []Event head atomic

"CPU usage is 50%. I don't see the problem." "io" Key string // "cycles"

type Event struct Ts uint64 PID uint32 Domain string // "cpu", "mem", "io" Key string // "cycles", "page_fault", "write_bytes" Value uint64 Stack []uintptr