October 2017
Intermediate to advanced
442 pages
12h 33m
English
Content preview from Architecting Modern Java EE Applications
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Dominating consumer - OS
The operating system dominates the CPU consumption when it's asked to work harder than it usually should. This means that too much CPU time is spent on resource and device management. This includes network and disk I/O, locks, memory management, or context switches.
If the CPU system time is more than a certain percentage value of the user time, the operating system is the dominating consumer. The jPDM identified 10% as a threshold value, based on the experience of analyzing innumerable production situations. That means if the CPU system time is more than 10% of the user time, the bottlenecks are contained in the OS subsystem.
In this case, we investigate the issue further using operating system tools, such as vmstat ...
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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.