I have an existing http server which I would like to profile. I have included _ .net/http/pprof"
to my imports, and I already have http server running:
router := createRouter()
server := &http.Server {
Addr: ":8080",
Handler: router,
ReadTimeout: 15*time.Second,
WriteTimeout: 15*time.Second,
// MaxHeaderBytes: 4096,
}
log.Fatal(server.ListenAndServe())
When I'm trying to access http://localhost:8080/debug/pprof/ I get 404 page not found
.
That's what I get when using go tool pprof
on a local machine:
userver@userver:~/Desktop/gotest$ go tool pprof http://192.168.0.27:8080/
Use of uninitialized value $prefix in concatenation (.) or string at /usr/lib/go/pkg/tool/linux_amd64/pprof line 3019.
Read http://192.168.0.27:8080/pprof/symbol
Failed to get the number of symbols from http://192.168.0.27:8080/pprof/symbol
userver@userver:~/Desktop/gotest$ go tool pprof http://localhost:8080/debug/pprof/profile
Read http://localhost:8080/debug/pprof/symbol
Failed to get the number of symbols from http://localhost:8080/debug/pprof/symbol
Same for a remote client:
MacBookAir:~ apple$ go tool pprof http://192.168.0.27:8080/
Use of uninitialized value $prefix in concatenation (.) or string at /usr/local/Cellar/go/1.3.2/libexec/pkg/tool/darwin_amd64/pprof line 3027.
Read http://192.168.0.27:8080/pprof/symbol
Failed to get the number of symbols from http://192.168.0.27:8080/pprof/symbol
It's not explicitly mentioned in the documentation, but net/http/pprof
only registers its handlers with http.DefaultServeMux
.
From the source :
func init() {
http.Handle("/debug/pprof/", http.HandlerFunc(Index))
http.Handle("/debug/pprof/cmdline", http.HandlerFunc(Cmdline))
http.Handle("/debug/pprof/profile", http.HandlerFunc(Profile))
http.Handle("/debug/pprof/symbol", http.HandlerFunc(Symbol))
http.Handle("/debug/pprof/trace", http.HandlerFunc(Trace))
}
If you're not using the default mux you just have to register any/all of those you want with whatever mux you're using, eg something like mymux.HandleFunc("…", pprof.Index)
, etc.
Alternatively you can listen on a separate port (also possibly bound to only localhost if desired) with the default mux as you've shown .
Looks like the problem was in a *mux.Router
used from github.com/gorilla/mux
which I used as a Handler
in my http.Server
instance.
Solution: just launch one more server just for the pprof
:
server := &http.Server {
Addr: ":8080",
Handler: router,
ReadTimeout: 15*time.Second,
WriteTimeout: 15*time.Second,
}
go func() {
log.Println(http.ListenAndServe(":6060", nil))
}()
log.Fatal(server.ListenAndServe())
If you're using a github.com/gorilla/mux.Router
you can simply hand off any request prefixed with /debug/
to the http.DefaultServeMux
.
import _ "net/http/debug"
router := mux.NewRouter()
router.PathPrefix("/debug/").Handler(http.DefaultServeMux)
Here's how to use pprof in combination with Gorilla mux . To avoid HTTP 404 errors we need to explicitly specify the route for /debug/pprof/{cmd}
because Gorilla doesn't do prefix routing:
router := mux.NewRouter()
router.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
router.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
router.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
router.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
router.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
router.Handle("/debug/pprof/{cmd}", http.HandlerFunc(pprof.Index)) // special handling for Gorilla mux
err := http.ListenAndServe("127.0.0.1:9999", router)
log.Errorf("pprof server listen failed: %v", err) // note: http.ListenAndServe never returns nil
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