Nov 30
I’m one of the lucky folk who was able to obtain a Raspberry Pi Zero for $5. Originally this was going to be an article reviewing the Pi Zero to see how much of a difference the overclocking really makes. That and my impressions of the Zero will be in a later post. TL;DR: The …
Oct 07
Many thanks and kudos to the most excellent people at Hypriot on their latest release! Hypriot has made Docker on the Pi easy — prior to their distribution it took a lot of blood, sweat, and tears to compile and get Docker working on the Pi. (Trust me!!! Been there, done that, have the t-shirt). …
Oct 02
While at a DevOps Birds of a Feather session at Ohio Linux Fest today I was describing to John Willis (@botchagalupe) my experiments with Docker and the Pi Swarm. Along the way, I mentioned that I’d gotten heterogenous docker swarms working using Powerstrip — aka Multifarious, first described in Heterogenous Docker Swarms Teaser. In so …
Sep 07
I’ve refreshed my stack and am rebuilding the cluster. I’m using Hypriot for the linux distribution, but I’m a smart sysadmin (read lazy) and don’t want to manually add them each time. Also, I want to make a script so that I can quickly rebuild. This is inspired by Let Docker Swarm all over your …
Sep 07
Sometimes it’s helpful to see if a particular parameter is set or not on the raspberry pi. This is where vcgencmd. However, vcgencmd is useful for many other things.
Aug 27
Oft times all thoughts of algorithms are left behind with school. If they’re not, it can be too easy to get caught up in spending too much time trying to do something the “most efficient” way at the expense of spending two weeks coding to save a few milliseconds, but still there is a lot …
Apr 28
Note: This is all very experimental; Docker does not support any architecture other than X86_64. The last few evenings I’ve been working on Mulitifarious, a means of creating heterogenous Docker Swarms. I’d previously found that I can create a swarm with heterogenous members — a swarm which has, say, X86_64 and Raspberry Pi members. The …
Apr 21
One of the possibly lesser used flags for docker run is -a which allows you to attach the container’s STDIN, STDOUT or STDERR and pipe it back to the shell which invoked the container. This allows you to construct pipelines of commands, just as you can with UNIX processes. For instance, using UNIX commands to …
Apr 19
Generally smaller Docker containers are preferred to larger ones. However, a smaller container is not always as performant as a larger one. By using a (slightly) larger container, performance improved over 30x. TL;DR The grep included in busybox is painfully slow. When doing using grep to process lots of data, add a (real) grep to …
Apr 18
Chemists can search databases using parts of structures, parts of their IUPAC names as well as based on constraints on properties. Chemical databases are particularly different from other general purpose databases in their support for sub-structure search. This kind of search is achieved by looking for subgraph isomorphism (sometimes also called a monomorphism) and is …
© 2008-2016 by Matthew K. Williams
Ramblings by Matt Williams is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Based on a work at http://matthewkwilliams.com.
Powered by WordPress and the Graphene Theme.
