Go语言性能监控和调优的工具和方法

import _ "net/http/pprof"

go tool pprof http://localhost:6060/debug/pprof/profile

import (
    "expvar"
    "net/http"
)
func main() {
    http.HandleFunc("/debug/vars", func(w http.ResponseWriter, r *http.Request) {
        expvar.Do(func(kv expvar.KeyValue) {
            fmt.Fprintf(w, "%s: %s\n", kv.Key, kv.Value.String())
        })
    })
    http.ListenAndServe(":8080", nil)
}

import (
    "log"
    "net/http"
    _ "net/http/pprof"
    "os"
    "runtime/trace"
)
func main() {
    f, err := os.Create("trace.out")
    if err != nil {
        log.Fatalf("failed to create trace file: %v", err)
    }
    defer f.Close()
    err = trace.Start(f)
    if err != nil {
        log.Fatalf("failed to start trace: %v", err)
    }
    defer trace.Stop()
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("hello, world"))
    })
    http.ListenAndServe(":8080", nil)
}

type Object struct {
    // ...
}
var objectPool = sync.Pool{
    New: func() interface{} {
        return &Object{}
    },
}
func GetObject() *Object {
    return objectPool.Get().(*Object)
}
func PutObject(obj *Object) {
    objectPool.Put(obj)
}

type WaitPool struct {
    lock   sync.Mutex
    cond   *sync.Cond
    maxLen int
    curLen int
}
func NewWaitPool(maxLen int) *WaitPool {
    pool := new(WaitPool)
    pool.maxLen = maxLen
    pool.cond = sync.NewCond(&pool.lock)
    return pool
}
func (pool *WaitPool) Wait() {
    pool.lock.Lock()
    defer pool.lock.Unlock()
    for pool.curLen >= pool.maxLen {
        pool.cond.Wait()
    }
    pool.curLen++
}
func (pool *WaitPool) Done() {
    pool.lock.Lock()
    defer pool.lock.Unlock()
    pool.curLen--
    pool.cond.Signal()
}