Go Performance

Skill: go-performance

Optimización de rendimiento en Go.

Cuándo usar este skill

• Al optimizar hot paths
• Al reducir allocations
• Al mejorar latencia

Principios

1. Medir primero con benchmarks
2. Identificar hot paths
3. Optimizar solo lo necesario

Técnicas de Optimización

Reducir Allocations

// ❌ MAL
var results []Result
for _, item := range items {
    results = append(results, transform(item))
}

// ✅ BIEN: Pre-allocate
results := make([]Result, 0, len(items))

Object Pooling

var bufferPool = sync.Pool{
    New: func() interface{} { return new(bytes.Buffer) },
}

func process() {
    buf := bufferPool.Get().(*bytes.Buffer)
    defer func() { buf.Reset(); bufferPool.Put(buf) }()
    // usar buf...
}

Caching

type ExpressionCache struct {
    mu    sync.RWMutex
    cache map[string]*Expression
}

func (c *ExpressionCache) GetOrCompile(expr string) (*Expression, error) {
    // Fast path: lectura
    c.mu.RLock()
    if e, ok := c.cache[expr]; ok {
        c.mu.RUnlock()
        return e, nil
    }
    c.mu.RUnlock()
    // Slow path: compilar y guardar
}

Benchmarks

go test -bench=. -benchmem ./...
go test -cpuprofile=cpu.prof -bench=BenchmarkX
go tool pprof cpu.prof

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