I can't figure out how to correctly use the profiler

[zachary...@gmail.com]

Hi, I'm working on a server for a game and I'm encountering a lot of lag on the server. I wanted to set up the profiler to see which functions were causing the most lag but I can't seem to figure out how to set it up:( Here's some of my code, I'm not really sure what code is relevant to this issue so just ask if you want to see more.

import (

"github.com/davecheney/profile"

)

var cfg = profile.Config{

MemProfile:     true,

ProfilePath:    ".",  // store profiles in current directory

NoShutdownHook: true, // do not hook SIGINT

}

var p = profile.Start(&cfg)

func main() {

rand.Seed(time.Now().Unix())

spawnNPCs()

loadAllItemData()

        //I'm sharing this code because I'm not sure if the fact that all the functions are on separate threads might be the problem.

go listenOn843()

go getConsoleInput()

go moveBullets()

go updatePlayers()

go updateNPCs()

go sendData()

listenForPlayers()

}

//I then stop the profile later on in the program via a command entered in the console

and I'll attach the pdf it generates. It doesn't show much info:( 

any help or information at all would be appreciated! I'm also not sure how to read the pdf, if anyone could explain the numbers I would be SUPER grateful!

Thanks!

[Shawn Milochik]

Have you read this?

http://blog.golang.org/profiling-go-programs

What does "newm" do? Is it creating a new item in memory when you could possibly re-use an existing one, possibly using the method described here?

https://www.youtube.com/watch?v=MeOK1UzGHYw&index=5&list=WL

(watch from 1:01:55 to 1:07:55).

[Matthew Zimmerman]

https://golang.org/pkg/net/http/pprof/

Do everything in the overview, it's fantastic.

go build && ./binarytorun

then in another terminal:

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

The pprof page doesn't show in the examples to include your binary on the go tool line.

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[zachary...@gmail.com]

I've read that and tried it and it produces basically the same thing:/

[zachary...@gmail.com]

I tried that and I just get a web page that says "Could not enable CPU profiling: cpu profiling already in use"

Do you know what that means?

It also downloads a profile, here is what is shows when exported to a pdf.

[Giulio Iotti]

On Sunday, November 8, 2015 at 7:52:00 AM UTC+2, zachary...@gmail.com wrote:

I tried that and I just get a web page that says "Could not enable CPU profiling: cpu profiling already in use"

Do you know what that means?

Please try putting the "profile.Start(&cfg)" line in main, like it's describe in the documentation. Also, stop it with defer:

defer profile.Start(&cfg).Stop()

-- 

Giulio Iotti

[Matthew Zimmerman]

The issue is you're now using different methods.  The net/pprof import enables almost everything and you can fetch it on the fly.  Dave Cheney's package is more explicit and only enables certain profiles, but it's more powerful on which ones it helps you enable.  Enabling both will cause the error you're seeing.

My recommendation would be to remove all of your profiling specific code with exception to what you see in the net/pprof documentation which is the import and the http listener (if you didn't have one already)

--

[zachary...@gmail.com]

I commented out everything that has to do with Dave Cheney's package and I still get that error when I go to the web page:(

[zachary...@gmail.com]

Okay, I did that. Here is my code now:

var cfg = profile.Config{

MemProfile:     true,

ProfilePath:    ".",  // store profiles in current directory

NoShutdownHook: true, // do not hook SIGINT

}

func main() {

p := profile.Start(&cfg)

rand.Seed(time.Now().Unix())

spawnNPCs()

loadAllItemData()

go listenOn843()

go getConsoleInput()

go moveBullets()

go updatePlayers()

go updateNPCs()

go sendData()

listenForPlayers()

p.Stop()

}

The program runs until I enter the command "stop", so it has enough time to collect data. 

But it still doesn't give as much information I feel like it should:( I'll attach the new pdf.

[Jochen Voss]

Hi Zacharym

On Sunday, 8 November 2015 16:51:22 UTC, zachary...@gmail.com wrote:

The program runs until I enter the command "stop", so it has enough time to collect data. 

But it still doesn't give as much information I feel like it should:( I'll attach the new pdf.

Are you on MacOSX?  I think the profiler does not work on MacOSX (something to do with samples being counted towards the wrong thread, if I remember correctly).

All the best,

Jochen

[andrey mirtchovski]

> Are you on MacOSX? I think the profiler does not work on MacOSX (something
> to do with samples being counted towards the wrong thread, if I remember
> correctly).

here's a reference for profiling on OSX: http://research.swtch.com/macpprof

[Carlos Castillo]

Actually, as of OSX 10.11 (El Capitan) CPU profiling works "out of the box" for go programs. As far as I can tell from the original example, it was attempting to do memory profiling, which always worked on OSX, but may not have been the profile the poster was interested in (it looks like he wants a CPU Profile).

[zachary...@gmail.com]

Shoot okay, I'm running 10.10, maybe updating will fix the issue. I'll update then see what happens, and if that doesn't work I'll check out what Andrey posted and if that also doesn't work I'll post here:)