Scala: "Working Hard to Keep It Simple"

A quick introduction to Scala programming language by its creator

O'Reilly OSCON Java 2011: Martin Odersky, "Working Hard to Keep It Simple" - YouTube:



Concurrency vs Parallelism - What is the difference? - Stack Overflow

Concurrency is when two tasks can start, run, and complete in overlapping time periods. It doesn't necessarily mean they'll ever both be running at the same instant. Eg. multitasking on a single-core machine.

Parallelism is when tasks literally run at the same time, eg. on a multicore processor.

Quoting Sun's Multithreaded Programming Guide:

• Parallelism: A condition that arises when at least two threads are executing simultaneously.
• Concurrency: A condition that exists when at least two threads are making progress. A more generalized form of parallelism that can include time-slicing as a form of virtual parallelism.