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README.md
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I've just started a new job at [Datadog](https://www.datadoghq.com/) to work on [Continuous Profiling](https://www.datadoghq.com/product/code-profiling/) for Go. To make sure that I know what I'm talking about, I'm planning to do an in-depth study of the existing profilers and how they work. I'll try to summarize what I learned in this repository as it might be useful to others. I've just started a new job at [Datadog](https://www.datadoghq.com/) to work on [Continuous Profiling](https://www.datadoghq.com/product/code-profiling/) for Go. To make sure that I know what I'm talking about, I'm planning to do an in-depth study of the existing profilers and how they work. I'll try to summarize what I learned in this repository as it might be useful to others.
- [pprof tool & format](./pprof.md): Describes the pprof tool and it's binary data format. - [pprof tool & format](./pprof.md): Describes the pprof tool and it's binary data format.
- [Goroutine Profiling](./goroutine.md)
## Todo ## Todo
- CPU Profiler - CPU Profiling
- Heap Profiler - Heap Profiling
- Mutex Profiler - Mutex Profiling
- Goroutine Profiler - Block Profiling
- Block Profiler - Wallclock Profiling (fgprof)
- Wallclock Profiler (fgprof)
## External Links ## External Links

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cpu.md
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🚧 This note is still work in progress, please come back later! 🚧 🚧 This note is still work in progress, please come back later! 🚧
# Go's CPU profiler # CPU Profiling in Go
[TOC]
## How it works ## How it works

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datadog.md
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## Payload Format ## Payload Format
TODO: This is outdated, needs updating [based on this PR](https://github.com/DataDog/dd-trace-go/pull/781).
The payload uses `multipart/form-data` encoding and includes the following form fields for every `batch` that is being uploaded. The payload uses `multipart/form-data` encoding and includes the following form fields for every `batch` that is being uploaded.
- `format`: Always `pprof` - `format`: Always `pprof`

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goroutine.md
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This document was last updated for `go1.15.6` but probably still applies to older/newer versions for the most parts. This document was last updated for `go1.15.6` but probably still applies to older/newer versions for the most parts.
# Go's Goroutine Profiler # Goroutine Profiling in Go
Go has various APIs to provide users with a list of **active** goroutines, their current stack trace, as well as various other properties. Some APIs expose this information as statistical summaries, while other APIs provide information for each individual goroutine. Go has various APIs to provide users with a list of **active** goroutines, their current stack trace, as well as various other properties. Some APIs expose this information as statistical summaries, while other APIs provide information for each individual goroutine.

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pprof.md
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- Write more about using `go tool pprof` itself. - Write more about using `go tool pprof` itself.
- Explain why pprof can be given a path to the binary the profile belongs to. - Explain why pprof can be given a path to the binary the profile belongs to.
- Get into more details about line numbers / addresses. - Get into more details about line numbers / addresses.
- Talk about mappings and when a Go binary might have more than one