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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