Preemption
The server kernel has kernel preemption turned off (CONFIG_PREEMPT_NONE=y), while the desktop kernel has it enabled (CONFIG_PREEMPT_BKL=y, CONFIG_PREEMPT_VOLUNTARY=y). Preemption works along with scheduling to fine-tune performance, efficiency and responsiveness. In non-preemptive kernels, kernel code runs until completion; the scheduler can't touch it until it's finished. But the Linux kernel allows tasks to be interrupted at nearly any point (but not when it is unsafe, which is a whole huge fascinating topic all by itself), so that tasks of lesser-priority can jump to the head of the line.
This is appropriate for desktop systems because users typically have several things going at once: writing documents, playing music, Web surfing, downloading and so on. Users don't care how responsive background applications are; they care only about the ones they're actively using. So if loading a Web page takes a little longer while the user is writing an e-mail, it's an acceptable trade-off. Overall efficiency and performance are actually reduced but not in a way that annoys the user.
On servers you want to minimize any and all performance hits, so turning off preemption is usually the best practice.
the Free Technology Academy (FTA) and the Free Software Foundation (FSF) just announced this week that they've teamed up on an online Master's Program in Free Software and Free Standards
Amsterdam-based FTA's virtual campus
All learning materials are published under a free license and can be accessed by anyone
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This is the seventh post in the article series "Vim Plugins You Should Know About". This time I am going to introduce you to a plugin called "ragtag.vim". A month ago it was still known as "allml.vim" but now it has been renamed to ragtag.vim.
The best parts of RagTag are mappings for editing HTML tags. It has a mapping for quickly closing open HTML tags, a mapping for quickly turning the typed word into a pair of open/close HTML tags, several mappings for inserting HTML doctype, linking to CSS stylesheets, loading JavaScript and it includes mappings for wrapping the typed text in a pair of tags for PHP, or for ASP or eRuby, and {% .. %} for Django.
RagTag is written by Tim Pope. He's the master of Vim plugin programming. I have already written about two of his plugins - surround.vim and repeat.vim and more articles about his plugins are coming!
Grep command is my favorite command in unix and I really like to use it for all searching stuff. unix grep command is both powerful and versatile and in this article I have shared 10 unique ways of using in your day 2 day life.
For Fedora 20, I also installed:
dbus-devel dbus-glib-devel json-c-devel
json-glib-devel libcap-devel libcap-ng-devel
libgudev1-devel libtool-ltdl-devel
systemd-devel
Simply how much targeted traffic are you currently shedding mainly because an individual never have identified several unexpected yet potent keywords and phrases?
Choosing the clear keywords and phrases to your internet pages is easy.
And also obtaining connected, high-demand and also low-supply keywords and phrases which can be potent to your web site just isn't too much once you begin making use of Wordtracker.
Yet think about people keywords and phrases which can be actually unexpected? Think about keywords and phrases you'll by no means consider, yet which may have the particular prospective to operate a vehicle thousands of fresh visitors to your internet site?Pleasant to be able to Wordtracker Search term Study AccountsBeing a Wordtracker client, you are going to right away acquire totally free usage of the most notable 1, 000 keywords and phrases used throughout the key engines like google : equally short-term and also long-term.And also for a few internet marketers, which is adequate.Nonetheless it just isn't adequate should you have identified the actual prospective regarding working together with one of the most searched-for or perhaps freshly growing keywords and phrases on the web.Significant web marketers and also SEARCH ENGINE MARKETING specialists which are seeking development final results consider Wordtracker's Search term Study Record alternatives: from your Top, 000, entirely for the Leading 20 thousand phrases.Just how these kinds of accounts supply development final resultsCheck our own Search term Study Accounts throughout. Try to find hugely well-known, or perhaps freshly growing phrases and words that might be utilized to make huge amounts regarding fresh targeted traffic.How can this kind of perform? You're not trying to find well-known keywords and phrases that may deliver folks inside from the "front door" of your distinct web site. You are interested in undiscovered jewels that will deliver a large amount regarding targeted traffic inside
the original Bourne Shell was very influential, the various System V shell releases preserved that heritage, and the Posix committee used those versions as the basis for the standard they developed.
Certainly the basic language syntax and built-in commands are direct descendants of the Bourne Shell's. Bash's additional features and functionality build on what the Bourne shell provided.
As for source code and internal implementation, there's no relationship at all
Bash will continue to evolve as both an interactive environment and a programming language. I'd like to add more features that allow interested users to extend the shell in novel ways. The programmable completion system is an example of that kind of extension.
Do you have any advice for up-and-coming programmers?
Find an area that interests you and get involved with an existing community. There are free software projects in just about any area of programming.
The nuts-and-bolts -- which language you use, what programming environment you use, where you do your work -- are not as important as the passion and interest you bring to the work itself.
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