Language Selection

English French German Italian Portuguese Spanish

An Interview with Jeff Dike - The creator of User Mode Linux

Filed under

Jeff Dike is the creator and maintainer of User Mode Linux (UML) - a virtual machine which runs on Linux. In recent times, UML has gained a lot of significance after Linus Torvalds incorporated the UML patch into the official Linux kernel source tree. Now a days Jeff works full time for Intel devoting his time towards further development of UML. He has also authored a book titled "User Mode Linux" published by Prentice Hall. After reading through the book written by him on this subject and also running UML on my machine, I had the desire to ask him a few questions on UML and how it fared when compared with other virtualization technologies. And Jeff very kindly agreed to take time off from his important work schedule to give answers to my queries. Without further ado here are the questions I posed to Jeff Dike along with his replies.

Question: There are a lot of virtualization technologies like VMware, Xen and QEMU other than UML. What are the relative strengths of UML which would urge a person in choosing it over its counterparts ?

Jeff Dike: The reason varies according to the technology that you're comparing UML to. With qemu and other instruction emulators, the attraction is speed. These let you boot a kernel on a machine with a different architecture, i.e. a ppc kernel on an i386 host. When the architecture of the virtual machine is the same as the host, there are few reasons to take the overhead of instruction emulation, even if the emulator is optimized in this case to just virtualize instructions.

Full Interview.

More in Tux Machines

Here Is What's New In Fedora 28

For those who don't know about this Linux distro, Fedora is one of those Linux distributions that comes released with cutting-edge software rather than staying on the same boat with other distributions that prefers stability. Fedora comes in three flavors: Workstation, Server, and Atomic. I'll be reviewing Fedora Workstation; used by many developers and users as their general purpose computing platform. Read

Stable kernels 4.16.11, 4.14.43 and 4.9.102

today's leftovers

Software: Grafana, Heaptrack, Vim

  • Grafana – An Open Source Software for Analytics and Monitoring
    Grafana is an open source, feature rich, powerful, elegant and highly-extensible analytics and monitoring software that runs on Linux, Windows and MacOS. It is a de facto software for data analytics, being used at Stack Overflow, eBay, PayPal, Uber and Digital Ocean – just to mention but a few. It supports 30+ open source as well as commercial databases/data sources including MySQL, PostgreSQL, Graphite, Elasticsearch, OpenTSDB, Prometheus and InfluxDB. It allows you to dig deeply into large volumes of real-time, operational data; visualize, query, set alerts and get insights from your metrics from differen
  • Heaptrack v1.1.0 release
    Better memory profiling on Linux After more than a year of work, I’m pleased to release another version of heaptrack, the Linux memory profiler! The new version 1.1.0 comes with some new features, significant performance improvements and – most importantly – much improved stability and correctness. If you have tried version v1.0 in the past and encountered problems, update to the new v1.1 and try again!
  • Ten Years of Vim

    The philosophy behind Vim takes a while to sink in: While other editors focus on writing as the central part of working with text, Vim thinks it's editing.


    You see, most of the time I don't spend writing new text; instead, I edit existing text.