README
¶
Goroutines
Goroutines are functions that are created and scheduled to be run independently by the Go scheduler. The Go scheduler is responsible for the management and execution of goroutines.
Notes
- Goroutines are functions that are scheduled to run independently.
- We must always maintain an account of running goroutines and shutdown cleanly.
- Concurrency is not parallelism.
- Concurrency is about dealing with lots of things at once.
- Parallelism is about doing lots of things at once.
"Parallelism is about physically doing two or more things at the same time. Concurrency is about undefined, out of order, execution." - William Kennedy
"By default, goroutines shouldn't outlive the function they were created from. this forces you into a extremely good design posture." - Peter Bourgon
Design Guidelines
- Learn about the design guidelines for concurrency.
Diagrams
How the scheduler works.
Links
Scheduling In Go - Part I - William Kennedy
Scheduling In Go - Part II - William Kennedy
Scheduler Tracing In Go - William Kennedy
Advanced Go Concurrency Patterns - Sameer Ajmani
Go Concurrency Patterns: Context - Sameer Ajmani
Concurrency is not parallelism - Rob Pike
Go, for Distributed Systems - Russ Cox
Go 1.5 GOMAXPROCS Default
Concurrency, Goroutines and GOMAXPROCS - William Kennedy
The Linux Scheduler: a Decade of Wasted Cores
Explanation of the Scheduler
15 Years of Concurrency - Joe Duffy
How does the golang scheduler work? - Ian Lance Taylor
The Scheduler Saga - Kavya Joshi
Code Review
Goroutines and concurrency (Go Playground)
Goroutine time slicing (Go Playground)
Goroutines and parallelism (Go Playground)
Exercises
Exercise 1
Part A Create a program that declares two anonymous functions. One that counts down from 100 to 0 and one that counts up from 0 to 100. Display each number with an unique identifier for each goroutine. Then create goroutines from these functions and don't let main return until the goroutines complete.
Part B Run the program in parallel.
Template (Go Playground) | Answer (Go Playground)
All material is licensed under the Apache License Version 2.0, January 2004.
Directories
¶
| Path | Synopsis |
|---|---|
|
Sample program to show how to create goroutines and how the scheduler behaves.
|
Sample program to show how to create goroutines and how the scheduler behaves. |
|
Sample program to show how the goroutine scheduler will time slice goroutines on a single thread.
|
Sample program to show how the goroutine scheduler will time slice goroutines on a single thread. |
|
Sample program to show how to create goroutines and how the goroutine scheduler behaves with two contexts.
|
Sample program to show how to create goroutines and how the goroutine scheduler behaves with two contexts. |
|
exercises
|
|
|
exercise1
Create a program that declares two anonymous functions.
|
Create a program that declares two anonymous functions. |
|
template1
Create a program that declares two anonymous functions.
|
Create a program that declares two anonymous functions. |