February 2017
Intermediate to advanced
400 pages
11h 59m
English
book
iOS and macOS™ Performance Tuning: Cocoa®, Cocoa Touch®, Objective-C®, and Swift™
by Marcel Weiher
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11. I/O: Measurement and Tools
Measuring I/O is even harder than measuring memory consumption. Most of the time, interesting events will be those where nothing is happening; the system is simply waiting for some external event such as the hard disk head moving to the right location. In addition, the whole operating system is designed purposely to make I/O measurement nonrepeatable—er, I mean, to optimize I/O, with lots of global shared state such as caches and disk layout. Even worse, while there are techniques for controlling these variables, they usually also lead to nonrepresentative measurements because the optimizations are absolutely necessary for normal operations.
To illustrate, we will use the short program from Example 11.1 that just ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.