Right way of finding memory leaks in game written in Go

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I am writing a game in Go. I was told my code was leaking memory. What would be the right approach to pinpoint the cause of the leaks?

I know pprof exists but as far as I know it can be used when your app uses the http package and my app is a simple game and it does not make use of any netowrk connectivity.

You can certainly create profiles without an http server using the runtime/pprof package. There's also github.com/pkg/profile by Dave Cheney, a wrapper for runtime/pprof with a simpler API. You can use signal handlers to enable and disable profiling, for instance.

That being said, nothing stops you from starting an HTTP server, just for pprof. I find that much more convenient because then you can easily create any profile on demand.

// +build debug

package main

import (
    "log"
    "net/http"
    _ "net/http/pprof/"
)

func init() {
    log.Println("Launching pprof server")
    go func() { log.Fatal(http.ListenAndServe("localhost:3030", nil)) }()
}

This uses a build tag so you can enable the server in development but exclude it from production builds. Compile with -tags debug to enable the server. See Build Constraints for details.

How I investigated memory leaks in Go using pprof on a large , At the time of writing, we were unable to find any tool online that can assist us with that. In Go, the simplest way to create a memory leak is defining a global variable, This great blog post describes that case in a good way. Obviously we have some memory leaks caused by smart pointers, that are still referenced somewhere in the code, so that their memory does not get free'd. It's very hard to find the line of code with the "needless" reference, that causes the corresponding object not to be free'd (although it's not of use any longer).

Apart from the pprof discussed before, it might also be useful to check heap allocation by doing an escape analysis of your code (e.g. if file is main.go) by:

go build -gcflags=-m main.go

This immediately gives you an idea of things like if you are passing pointers around unnecessarily which can be avoided.

Here is a short article which goes through various ways you can make your program more efficient.

Memory Leaking Scenarios, The disadvantage of the third way is it is a little verbose (by comparing to the first two ways). A good news is, since Go 1.12, we can call the Repeat function with  Memory leaks where ? In your application or memory leaks in the kernel ? The kernel ones are hard to catch. As such there is not shell script which detects memory leaks. You would have to constantly monitor the output of pmap -d, ps -elf listing et al. You need to be careful at the numbers you are looking.

You can use https://golang.org/pkg/runtime/pprof/ package to write memory profiles on disk (you can do it let's say once in a minute). After that just run go tool pprof (inuse_space mode) on few of them and look if there are some parts where inuse_space is growing

SRE: Debugging: Simple Memory Leaks in Go, Along the way we'll be forming a series of hypotheses, they will be necessarily general at first then progressively more specific. This is loosely  Plotting memory usage over time is a good way of finding leaks and other problematic patterns. Now, we already have memory leak detection in the engine, but it only detects memory that never gets

Plugging leaks in Go memory management, Investigating memory leaks can be fun, sometimes. Not being extremely fancy, Go is practical and efficient and is a way to get memory management style, you'​ll still have to dust off old good valgrind to understand what's going on. With architectures like Acra's, it's quite hard to detect some memory  Depending on what definition of "memory leak" we are using, you may be able to detect leaks by looking at the virtual set size. On HP-UX you can do this with: UNIX95=1 export UNIX95 ps -o pid,comm,sz,vsz -e Or if you're using a real shell, just: UNIX95=1 ps -o pid,comm,sz,vsz -e HP has a product called glance which is a much better tool for

SRE: Debugging Simple Memory Leaks in Go : golang, Character path-finding works between the regions. The game audio/input/​rendering framework Ebiten has been updated and increased performance. A Patreon  So unless you expressly write your program in such a way to bloat the memory usage, e. 7, we noticed a memory leak in threading. ­Locking and Atomicity If a group of variables are always read and written within the same lock, you can say the variables are read and written atomically.

A Tale of Two Memory Leaks in Go, In this post I'll illustrate two ways I've accidentally caused slow but The phrase “​memory leak” isn't really accurate, but I can't think of a The defer allows you to place the closing/cleanup of the resource right next to where it's created. If you'​ve ever written larger programs that open and need to clean up  Discover the Unity Memory Profiler map visualization mode to understand the memory layout of your game and all its regions

Comments
  • There is no such limit in pprof, you can use it whether you have network connections or not. See golang.org/pkg/net/http/pprof
  • It may be useful if you mention some details about the game, especially its gui part.