Skill: go-performance

Name: go-performance
Rating: 87
Author: gofhir

Optimización de rendimiento en Go.

Cuándo usar este skill

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

Principios

•Medir primero con benchmarks
•Identificar hot paths
•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

bash

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