Language Selection

English French German Italian Portuguese Spanish

Linux: Tuning CFS

Filed under
Linux

Nick Piggin used 'git bisect' to track a lmbench regression to the main CFS commit, leading to an interesting discussion between Nick and Ingo Molnar. Ultimately the regression was tracked down to the temporary configurability of the scheduler while it is tuned for optimal performance, "one reason for the extra overhead is the current tunability of CFS, but that is not fundamental, it's caused by the many knobs that CFS has at the moment." The solution, already coded but not yet merged in the mainline kernel "changes those knobs to constants, allowing the compiler to optimize the math better and reduce code size," and as a result result, "CFS can be faster at micro-context-switching than 2.6.22."

Ingo described the lmbench configuration in question as a "micro-benchmark", and noted that with a macro-benchmark better performance was more pronounced, "because with CFS the _quality_ of scheduling decisions has increased.

More Here




More in Tux Machines

KDevelop 5.0.0 release

Almost two years after the release of KDevelop 4.7, we are happy to announce the immediate availability of KDevelop 5.0. KDevelop is an integrated development environment focusing on support of the C++, Python, PHP and JavaScript/QML programming languages. Many important changes and refactorings were done for version 5.0, ensuring that KDevelop remains maintainable and easy to extend and improve over the next years. Highlights include much improved new C/C++ language support, as well as polishing for Python, PHP and QML/JS. Read more

CoreOS 1068.10.0 Released with Many systemd Fixes, Still Using Linux Kernel 4.6

Today, August 23, 2016, the development team behind the CoreOS security-oriented GNU/Linux operating system have released the CoreOS 1068.10.0 stable update, along with new ISO images for all supported platforms. Read more

SUSE Linux and openSUSE Leap to Offer Better Support for ARM Systems Using EFI

The YaST development team at openSUSE and SUSE is reporting on the latest improvements that should be available in the upcoming openSUSE Leap 42.2 and SUSE Linux Enterprise 12 Service Pack 2 operating systems. Read more

Create modular server-side Java apps direct from mvn modules with diet4j instead of an app server

In the latest release, the diet4j module framework for Java has learned to run modular Java apps using the Apache jsvc daemon (best known from running Tomcat on many Linux distros). If org.example.mydaemon is your top Maven project, all you do is specify it as the root module for your jsvc invocation, and diet4j figures out the dependencies when jsvc starts. An example systemd.service file is available.