Veröffentlicht am 21.12.2016

Demo from the USENIX/LISA 2016 talk: Linux 4.X Tracing Tools: Using BPF Superpowers. Full talk slides and official video will be available at https://www.usenix.org/conference/lis... . This video is the 15 (more like 18) minute demo that spans ftrace, perf, and BPF. LISA is a registered trademark of the USENIX Association and is used in this video with permission.

blockdiag and its family generate diagram images from simple text files:

Features:

Supports many types of diagrams
        block diagram (w/ blockdiag)
        sequence diagram (w/ seqdiag)
        activity diagram (w/ actdiag)
        logical network diagram (w/ nwdiag)

Generates beautiful diagram images from simple text format (similar to graphviz’s DOT format)

Layouts diagram elements automatically

Embeds to many documentations; Sphinx, Trac, Redmine and some wikis

Enjoy documentation with blockdiag !

An important ingredient in the Technology of Cyberspace is the ability to let any user communicate with any other user or service. How do we wire 5 billion people on the planet? That's an engineering problem - to design a network capable of handling such numbers over such a wide geographic area. We are going to talk about the engineering aspects of such network design for next two lectures.

Der Psychologe Michal Kosinski hat eine Methode entwickelt, um Menschen anhand ihres Verhaltens auf Facebook minutiös zu analysieren. Und verhalf so Donald Trump mit zum Sieg

One of the most common questions I’m asked to cover when I discuss software architecture topics is the difference between the various application messaging protocols that exist today—issues like how and why the protocols came about, and which one should be used in a particular application.

OpenStack is on a six-month release cycle, with each release given a code name starting with consecutive letters of the alphabet. On October 7th, OpenStack Newton was released. Let's look at a few highlights from OpenStack's 2016 Newton release.

In addition to the usual enormous number of incremental improvements, the Newton release focused on ease of deployment and usability improvements, as well as improved container-management tools. It also added the Tacker project, for deploying and managing virtual network functions (NFV) on OpenStack.

InSpec is compliance as code – a human-readable language for automating the continuous testing and compliance auditing of your entire infrastructure. You can also use it to verify if your servers and applications are configured correctly.

BCC is a toolkit for creating efficient kernel tracing and manipulation programs, and includes several useful tools and examples. It makes use of extended BPF (Berkeley Packet Filters), formally known as eBPF, a new feature that was first added to Linux 3.15. Much of what BCC uses requires Linux 4.1 and above.

eBPF was described by Ingo Molnár as:

One of the more interesting features in this cycle is the ability to attach eBPF programs (user-defined, sandboxed bytecode executed by the kernel) to kprobes. This allows user-defined instrumentation on a live kernel image that can never crash, hang or interfere with the kernel negatively.

BCC makes BPF programs easier to write, with kernel instrumentation in C (and includes a C wrapper around LLVM), and front-ends in Python and lua. It is suited for many tasks, including performance analysis and network traffic control.

Published on Mar 2, 2016

Video: https://www.facebook.com/atscaleevents/videos/1693888610884236/

Failure is inevitable. As engineers building and maintaining complex systems, we likely encounter failure in some form on a daily basis. Not every failure requires a postmortem, but if a failure impacts the bottom line of the business, it becomes important to follow a postmortem process. I say “follow a postmortem process” instead of “do a postmortem”, because a postmortem should have very specific goals designed to prevent future failures in your environment. Simply asking the five whys to try and determine the root cause is not enough.

Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should!) also be automated as well.

Selenium has the support of some of the largest browser vendors who have taken (or are taking) steps to make Selenium a native part of their browser. It is also the core technology in countless other browser automation tools, APIs and frameworks.
Which