September 2016
Intermediate to advanced
989 pages
24h 10m
English
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Measuring scheduling latencies
All the configuration and tuning you may do will be pointless if you cannot show that your device meets the deadlines. You will need your own benchmarks for the final testing but I will describe here two important measurement tools: cyclictest and Ftrace.
cyclictest
cyclictest was originally written by Thomas Gleixner and is now available on most platforms in a package named rt-tests. If you are using the Yocto Project, you can create a target image that includes rt-tests by building the real-time image recipe like this:
$ bitbake core-image-rt
If you are using Buildroot, you need to add the package, BR2_PACKAGE_RT_TESTS in the menu Target packages | Debugging, profiling and benchmark | rt-tests.
cyclictest measures ...
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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.