Memory Profiling & High-Throughput HTTP

Diagnosing Garbage Collection Pauses

In latency-critical services, small short-lived allocations create severe GC CPU overhead.

Essential Commands

# Capture 30s CPU profile
go tool pprof http://localhost:6060/debug/pprof/profile?seconds=30

# Inspect heap allocations
go tool pprof -alloc_space http://localhost:6060/debug/pprof/heap

Zero-Allocation Techniques

• Use sync.Pool for heavy temporary buffers.
• Preallocate slice capacity when length is known: make([]byte, 0, expectedLen).
• Pass pointers only when escaping to heap is intentional.