mikeash.com: Friday Q&A 2013-10-11: Why Registers Are Fast and RAM Is Slow
In the previous article on ARM64, I mentioned that one advantage of the new architecture is the fact that it has twice as many registers, allowing code load data from RAM less often, which is much slower. Reader Daniel Hooper asks the natural question: just why is RAM so much slower than registers? Distance Let's start with distance. It's not necessarily a big factor, but it's the most fun to anal
mikeash.com: Friday Q&A 2009-09-11: Intro to Grand Central Dispatch, Part III: Dispatch Sources
Welcome back to another Friday Q&A. This week I continue the discussion of Grand Central Dispatch from the past two weeks. In the last two weeks I mainly focused on dispatch queues. This week I'm going to examine dispatch sources, how they work, and how to use them. Note that I assume you've already read the first two posts in this series. The first post is particularly important, the second one l
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mikeash.com: Friday Q&A 2015-05-29: Concurrent Memory Deallocation in the Objective-C Runtime
