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What's it called when multiple threads execute at the same time? Parallelism? Concurrency? 🤔 Is there a difference? (Spoiler: Yes!)
Let me explain in a few tweets, ripping off @pressron's #InsideJava blog post "On Parallelism and Concurrency". 🧵
inside.java/2021/11/30/on-…
Let me explain in a few tweets, ripping off @pressron's #InsideJava blog post "On Parallelism and Concurrency". 🧵
inside.java/2021/11/30/on-…
Parallelism:
Taking a task and splitting it up, so multiple CPUs can compute partial solutions in parallel to solve the task in less wall-clock time.
Concurrency:
Having a number of tasks that need to be arranged in a way that solves as many of them per $time_unit as possible.
Taking a task and splitting it up, so multiple CPUs can compute partial solutions in parallel to solve the task in less wall-clock time.
Concurrency:
Having a number of tasks that need to be arranged in a way that solves as many of them per $time_unit as possible.
Some parallelizable tasks:
* sorting an array
* inverting a matrix
* rendering graphics
Some examples for concurrency:
* processing incoming web requests
* making outbound calls to DB and/or other web services
* observe file system for changes
* sorting an array
* inverting a matrix
* rendering graphics
Some examples for concurrency:
* processing incoming web requests
* making outbound calls to DB and/or other web services
* observe file system for changes
