<https://lh3.googleusercontent.com/-vELZJKELDUs/WiJ_1zDqGUI/AAAAAAAABMo/U-3xe5_KqqwMwTRmYzBCjE7Nkr9Dfwk3wCLcBGAs/s1600/profile001.png>
I finally found the problem!!!
Since I am using a custom mux, I needed to register the pprof handler funcs
to my custom router
router.HandlerFunc(http.MethodGet, "/debug/pprof/", pprof.Index)
router.HandlerFunc(http.MethodGet, "/debug/pprof/cmdline", pprof.Cmdline)
router.HandlerFunc(http.MethodGet, "/debug/pprof/profile", pprof.Profile)
router.HandlerFunc(http.MethodGet, "/debug/pprof/symbol", pprof.Symbol)
router.HandlerFunc(http.MethodGet, "/debug/pprof/trace", pprof.Trace)
router.Handler(http.MethodGet, "/debug/pprof/goroutine",
pprof.Handler("goroutine"))
router.Handler(http.MethodGet, "/debug/pprof/heap", pprof.Handler("heap"))
router.Handler(http.MethodGet,"/debug/pprof/threadcreate",
pprof.Handler("threadcreate"))
router.Handler(http.MethodGet,"/debug/pprof/block", pprof.Handler("block"))
Then, I started my benchmark (go-wrk) and then I started the pprof tool (go
tool pprof http://localhost:4000/debug/pprof/heap)
<https://lh3.googleusercontent.com/-vELZJKELDUs/WiJ_1zDqGUI/AAAAAAAABMo/U-3xe5_KqqwMwTRmYzBCjE7Nkr9Dfwk3wCLcBGAs/s1600/profile001.png>
After hitting "web", I was granted this wonderful graph:
Am Freitag, 1. Dezember 2017 18:52:21 UTC+1 schrieb basti skalendudler:
>
> Specifically, I wanted to see heap allocations generated by incoming
> requests, so I can optimize my handler functions
>
> I will write a more basic webserver example to see if I can produce the
> result I am expecting
>
> Am Donnerstag, 30. November 2017 14:39:56 UTC+1 schrieb Karan Chaudhary:
>>
>> Attaching png:
>>
>>
>> <https://lh3.googleusercontent.com/-3pu5f0Zvebw/WiAKKFjnVnI/AAAAAAAAKG4/hnPspzQzf7ASbvqtTU64rEMPSsZ3G1bzgCLcBGAs/s1600/profile003.png>
>>
>>
>> On Thursday, 30 November 2017 19:09:04 UTC+5:30, Karan Chaudhary wrote:
>>>
>>> Are you just trying to see how heap allocation can be seen using
>>> debug/pprof?
>>>
>>> Maybe you're allocating too less. Try to allocate exponentialy.
>>>
>>> package main
>>>
>>> import (
>>> "log"
>>> "net/http"
>>> "time"
>>>
>>> _ "net/http/pprof"
>>> )
>>>
>>> func expalloc() {
>>> x := make([]int, 0)
>>> for i := 0; i < 10; i++ {
>>> x = append(x, i)
>>> x = append(x, x...)
>>> }
>>>
>>> time.Sleep(10 * time.Second)
>>> }
>>>
>>> func main() {
>>> go func() {
>>> log.Println(http.ListenAndServe("localhost:6060", nil))
>>> }()
>>>
>>> expalloc()
>>>
>>> }
>>>
>>> Allocations on my machine (reduce 50 to smaller number as the program
>>> might go out of memory):
>>>
>>>
>>> <https://lh3.googleusercontent.com/-FqrfDyq6nRI/WiAJLLceTbI/AAAAAAAAKGw/AhU2-Tb-3dkJ9Wihr4iS7xynMq0r6sQCQCLcBGAs/s1600/profile003.png>
>>>
>>>
>>>
>>>
>>> On Wednesday, 29 November 2017 19:47:11 UTC+5:30, basti skalendudler
>>> wrote:
>>>>
>>>> Does noone have an idea? :(
>>>>
>>>> Am Montag, 27. November 2017 13:37:43 UTC+1 schrieb basti skalendudler:
>>>>>
>>>>> The go tool pprof command is interactive, so I thought it is enough
>>>>> type 'png' to get the image after the benchmark is run
>>>>>
>>>>> I tested to start go tool pprof now as well during and after the
>>>>> benchmark -> nothing changes
>>>>>
>>>>> Am Montag, 27. November 2017 04:37:48 UTC+1 schrieb Karan Chaudhary:
>>>>>>
>>>>>> From the top of my head, shouldn't the benchmark be done when
>>>>>> traffic is being sent to the server and not before it is sent?
>>>>>>
>>>>>> On Sunday, 26 November 2017 00:11:40 UTC+5:30, basti skalendudler
>>>>>> wrote:
>>>>>>>
>>>>>>> Hey guiys, I posted a StackOF question two days ago, but so far
>>>>>>> nobody was able to help me!
>>>>>>>
>>>>>>> I am trying to profile my web server I wrote, but my pprof does not
>>>>>>> contain any data about the handler func.
>>>>>>> I am using the httprouter package
>>>>>>> <https://github.com/julienschmidt/httprouter> by julienschmidt, and
>>>>>>> want to simply benchmark one of my handlers and see the pprof profile
>>>>>>> for
>>>>>>> that. For the benchmarking, I am using go-wrk
>>>>>>> <https://github.com/tsliwowicz/go-wrk>
>>>>>>>
>>>>>>> I set up my web server and pprof like this:
>>>>>>>
>>>>>>>
>>>>>>> // Configure the server
>>>>>>> server := &http.Server{
>>>>>>> Addr: ":4000",
>>>>>>> Handler: router,
>>>>>>> }
>>>>>>>
>>>>>>>
>>>>>>> go func() {
>>>>>>> log.Println(http.ListenAndServe(":6060", nil))
>>>>>>> }()
>>>>>>>
>>>>>>>
>>>>>>> // Start the server
>>>>>>> err = server.ListenAndServe()
>>>>>>> if err != nil {
>>>>>>> panic(err)
>>>>>>> }
>>>>>>>
>>>>>>>
>>>>>>> The router is initialized like this:
>>>>>>>
>>>>>>>
>>>>>>> // Create the httprouter
>>>>>>> router := httprouter.New()
>>>>>>> // Register all handlers
>>>>>>> router.GET("/entities/:type/map", h.UseHandler(&h.
>>>>>>> ApiGetEntitiesMapRequest{}, p))
>>>>>>>
>>>>>>>
>>>>>>> And my handler looks like this:
>>>>>>>
>>>>>>>
>>>>>>> func (req ApiGetEntitiesMapRequest) Handle(r *http.Request, hrp
>>>>>>> httprouter.Params, p Params) (interface{}, error) {
>>>>>>> test := make([]string, 0)
>>>>>>> for i := 0; i < 1000; i++ {
>>>>>>> test = append(test, "1")
>>>>>>> test = append(test, "2")
>>>>>>> // Ensure pprof has some time to collect its data
>>>>>>> time.Sleep(10)
>>>>>>> }
>>>>>>> return test, nil
>>>>>>> }
>>>>>>>
>>>>>>> This handler is just a test, where I dynamically append a lot of
>>>>>>> elements to a slice. The reason for that is, I wanted to test whether
>>>>>>> these
>>>>>>> dynamic allocations are represented in the heap profile of pprof.
>>>>>>>
>>>>>>> Now, what I did was:
>>>>>>>
>>>>>>> - Start my server
>>>>>>> - execute **go tool pprof http://localhost:6060/debug/pprof/heap**
>>>>>>> in my terminal
>>>>>>> - then benchmark my handler by executing **go-wrk -no-c -d 5
>>>>>>> http://localhost:4000/entities/object/map**
>>>>>>>
>>>>>>> The request works and my benchmark also reports everything
>>>>>>> correctly. However, when I type **png** in the pprof terminal, I get
>>>>>>> this
>>>>>>> graph:
>>>>>>>
>>>>>>>
>>>>>>> <https://lh3.googleusercontent.com/-H5BlDsvkGc8/WhkpNlbAgBI/AAAAAAAABMQ/MagwiySh4F8G5NvT4V4_uTAnHexw0VqBACLcBGAs/s1600/profile001.png>
>>>>>>>
>>>>>>>
>>>>>>> The graph does not contain any information about my handler and the
>>>>>>> costly heap allocations I did in my handler. What am I doing wrong?
>>>>>>>
>>>>>>
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