goroutines/

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.

Design Guidelines

• Learn about the design guidelines for concurrency.

Diagrams

How the scheduler works.

Difference between concurrency and parallelism.

Links

http://blog.golang.org/advanced-go-concurrency-patterns
http://blog.golang.org/context
http://blog.golang.org/concurrency-is-not-parallelism
http://talks.golang.org/2013/distsys.slide
Go 1.5 GOMAXPROCS Default
http://www.goinggo.net/2014/01/concurrency-goroutines-and-gomaxprocs.html
The Linux Scheduler: a Decade of Wasted Cores
Explanation of the Scheduler
15 Years of Concurrency - Joe Duffy

Code Review

Goroutines and concurrency (Go Playground)
Goroutine time slicing (Go Playground)
Goroutines and parallelism (Go Playground)
Less is more (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)

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All material is licensed under the Apache License Version 2.0, January 2004.