Profiling

[Sachinxmpl]

Summary by CodeRabbit

• New Features

  • Added an optional debug server for runtime profiling and diagnostics.
  • Added configurable profiling support for CPU, memory, and goroutine activity.

• Documentation

  • Added profiling instructions, benchmark findings, and sample profiling reports.
  • Updated the example configuration with health checks, rate limits, timeouts, routing, and weighted backends.

• Chores

  • Added profiling files to version control and included a script for generating profiling data.

[coderabbitai]

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Free

Run ID: 260e37c3-5366-46d6-95aa-bc43859fbf2f

📥 Commits

Reviewing files that changed from the base of the PR and between 8de9cae and ba2284d.

📒 Files selected for processing (13)

• .gitignore
• cmd/gobalancer/serve.go
• configl7.example.yaml
• docs/benchmark.md
• docs/profiles/cpu-top.txt
• docs/profiles/cpu.prof
• docs/profiles/goroutine-top.txt
• docs/profiles/goroutine.prof
• docs/profiles/heap-top.txt
• docs/profiles/heap.prof
• docs/profiling.md
• internal/debug/server.go
• test/bench/profile.sh

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📝 Walkthrough

Walkthrough

The change adds an optional pprof debug server, a profiling script, profiling reports, profiling documentation, and an expanded example L7 configuration.

Changes

Profiling support

Layer / File(s)	Summary
Debug server lifecycle cmd/gobalancer/serve.go, internal/debug/server.go	GoBalancer accepts --debug-addr, starts the pprof server when configured, reports startup errors, and shuts it down with the shared context.
Profiling workload and capture harness test/bench/profile.sh, configl7.example.yaml, .gitignore	The script builds and starts the profiling workload, generates sustained traffic, captures CPU, heap, and goroutine profiles, and writes summaries under docs/profiles/. The example configuration defines the listener, balancing, health checks, rate limits, timeouts, and two weighted backends.
Profiling results and documentation docs/profiling.md, docs/benchmark.md, docs/profiles/*	Documentation describes the profiling procedure, workload, results, and limitations. CPU, heap, and goroutine profile reports are included.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to ba228

This profiling-focused change has no actionable merge-blocking risk identified at the current head; it is merge-ready after normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant ProfileScript
  participant FastBackends
  participant GoBalancer
  participant LoadGenerator
  participant Pprof
  ProfileScript->>FastBackends: Start two test backends
  ProfileScript->>GoBalancer: Start with pprof enabled
  LoadGenerator->>GoBalancer: Generate sustained HTTP load
  ProfileScript->>Pprof: Request CPU, heap, and goroutine profiles
  Pprof-->>ProfileScript: Return profile data
  ProfileScript->>ProfileScript: Write pprof summaries

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