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DataDog logogo-profiler-notes

felixge's notes on the various go profiling methods that are available.

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pprof is a tool for visualization and analysis of profiling data

felixge's notes on the various go profiling methods that are available.

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Simple profiling for Go

Quick Overview

The DataDog/go-profiler-notes repository is a collection of notes and resources related to Go profiling. It provides insights and best practices for profiling Go applications, helping developers optimize their code's performance.

Pros

  • Comprehensive coverage of various Go profiling tools and techniques
  • Detailed explanations and examples for different profiling use cases
  • Vendor-neutral approach, not tied to a specific profiling tool or service
  • Regularly updated with new content and community contributions

Cons

  • Not a code library, so no direct code examples or quick-start guide
  • Primarily focused on profiling, may not cover other performance optimization techniques
  • Some content may be specific to certain Go versions or environments

Code Examples

This repository does not contain any code examples, as it is a collection of notes and resources rather than a code library.

Getting Started

Since this is not a code library, there are no getting started instructions to provide. The repository is meant to be a reference guide for Go developers interested in profiling their applications.

Competitor Comparisons

7,822

pprof is a tool for visualization and analysis of profiling data

Pros of google/pprof

  • Widely adopted and well-documented, with a large community of users and contributors.
  • Provides a comprehensive set of profiling tools, including CPU, memory, and contention profiling.
  • Integrates well with the Go standard library, making it easy to use in Go projects.

Cons of google/pprof

  • Can be more complex to set up and configure compared to DataDog/go-profiler-notes.
  • May require more manual analysis and interpretation of the profiling data.
  • Doesn't provide the same level of visualization and analysis features as DataDog/go-profiler-notes.

Code Comparison

Here's a brief code comparison between the two projects:

DataDog/go-profiler-notes:

import (
    "github.com/DataDog/go-profiler-notes"
)

func main() {
    profiler.Start()
    // Your application code
    profiler.Stop()
}

google/pprof:

import (
    "runtime/pprof"
)

func main() {
    pprof.StartCPUProfile(os.Stdout)
    defer pprof.StopCPUProfile()
    // Your application code
}

As you can see, the DataDog/go-profiler-notes approach is more concise and easier to integrate into your application, while the google/pprof approach requires more manual setup and configuration.

felixge's notes on the various go profiling methods that are available.

Pros of DataDog/go-profiler-notes

  • Provides detailed documentation and examples for using the Go profiler
  • Includes a comprehensive overview of various profiling techniques and tools
  • Offers insights into common performance issues and how to address them

Cons of DataDog/go-profiler-notes

  • Limited to Go-specific profiling, may not be as useful for other programming languages
  • Focuses more on theory and less on practical, hands-on examples
  • May not cover the latest updates and changes to the Go profiler

Code Comparison

DataDog/go-profiler-notes:

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("Hello, World!"))
    })
    http.ListenAndServe(":8080", nil)
}

DataDog/go-profiler-notes:

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("Hello, World!"))
    })
    http.ListenAndServe(":8080", nil)
}

The code snippets are identical, as they both demonstrate a simple Go web server that listens on port 8080 and responds with "Hello, World!".

1,986

Simple profiling for Go

Pros of pkg/profile

  • Simplicity: pkg/profile provides a straightforward and lightweight profiling solution, making it easy to integrate into Go projects.
  • Standard Library Compatibility: As part of the Go standard library, pkg/profile benefits from the same level of support and stability as other standard library packages.
  • Cross-Platform Compatibility: pkg/profile is designed to work across different platforms, ensuring consistent profiling behavior.

Cons of pkg/profile

  • Limited Functionality: Compared to DataDog/go-profiler-notes, pkg/profile offers fewer advanced profiling features and customization options.
  • Lack of Visualization Tools: pkg/profile does not provide built-in visualization tools, which can make it more challenging to analyze profiling data.

Code Comparison

Here's a brief code comparison between the two repositories:

pkg/profile:

import "runtime/pprof"

func main() {
    defer pprof.StopCPUProfile()
    pprof.StartCPUProfile(os.Stdout)
    // Your application code here
}

DataDog/go-profiler-notes:

import "github.com/DataDog/go-profiler-notes"

func main() {
    defer profiler.Stop()
    profiler.Start(profiler.Config{
        DebugLevel: profiler.DebugLevelInfo,
    })
    // Your application code here
}

The key differences are that DataDog/go-profiler-notes provides a more feature-rich and configurable profiling solution, while pkg/profile offers a simpler and more lightweight approach.

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README

go-profiler-notes

Hey there 👋🏻, I'm felixge and I've just started a new job at Datadog to work on Continuous Profiling for Go.

I found that Go has a lot of profilers and there are many tools for looking at the data, but that there is very little information on what any of it means. So in order to make sure that I know what I'm talking about, I've started to research the existing profilers and how they work. This repository is my attempt to summarize my findings in the hope that it might be useful to others.

External Links

  • Go Docs
    • Diagnostics: Has a very good overview over the available profiling and tracing facilities but doesn't go into a lot of depth.
    • runtime/pprof: Lists the available profiles and has a little more explanation about what kind of data they produce.
    • runtime: Has documentation on the various control knobs and pprof facilities, e.g. MemProfileRate.
    • net/http/pprof: Not a lot of docs, but diving into the code from there shows how the various profilers can be started/stopped on demand.
  • JBD
    • Profiler labels in Go: An introduction to using pprof labels and how they allow you to add additional context to your profiles.
    • Custom pprof profiles: Example for using custom profiles, shows tracking open/close events of a blob store and how to figure out how many blobs are open at a given time.
    • Mutex profile: Brief intro to the mutex profile.
    • Using Instruments to profile Go programs: How to use the macOS Instruments app (I think it's built on dtrace) to profile Go programs. Not clear what the benfits are, if any.
  • Profiling Go programs with pprof by Julia Evans: A nice tour with a focus on heap profiling and the pprof output format.

Got great links to recommend? Open an issue or PR, I'd happy to add your suggestions : ).

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License

The markdown files in this repository are licensed under the CC BY-SA 4.0 license.

Disclaimers

I'm felixge and work at Datadog on Continuous Profiling for Go. You should check it out. We're also hiring : ).

The information on this page is believed to be correct, but no warranty is provided. Feedback is welcome!