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Congrats to SpaceX on Ocean Landing
I used to write telemetry collection software for the Space Shuttle, rockets and balloons, but even I watched the SpaceX barge landing with disbelief as the rocket smoothly rotated in all 11 or so...
View ArticleWeekend of Earthquakes
There were a few major earthquakes this weekend: Ueki, Japan – 6.2 (foreshock) Kumamoto, Japan – 7.0 Ecuador – 7.8 Hundreds of aftershocks have occurred in Japan. You would think that Californians, of...
View ArticleFarewell to Prince
Disbelief at the death of Prince at the relatively young age of 57. Prince was a musical genius, certainly one of the giants of this century – he wrote, sang, was a virtuoso of 2 dozen instruments, and...
View ArticleLinks for Misuse of Statistical Methods
MRI software bugs could upend years of research HN: Integer percentages as fingerprints of electoral falsification A dialogue on likelihoods and p-values
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High Performance Computing Analysis Concepts
To understand how to improve program or system performance, it helps to know what the ideal performance envelope is. If you get that wrong, no amount of profiling afterward will regain the lost...
View ArticleRe: Botched Go-around Appears To Have Led to Emirates 777 Crash
As a commercially-rated airline pilot who reads accident reports, I always get nervous when I fly on anything but a USA majors flight in less than perfect weather. The recent Emirates 777 crash in...
View ArticlePerl Petstore Enhanced REST API Framework
I’ve been doing a lot of work with REST APIs and microservices, so I decided to write a complete REST API framework in Perl based on the Mojolicious and Swagger2 Petstore sample. You can git clone the...
View ArticleJohn Collins “The Paper Airplane Guy”
CNN linked to a video of John Collins, “The Paper Airplane Guy.” John holds the world-record for paper airplane distance throwing. I had a chance to see John live recently when he gave a lecture and...
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Colgan: The Gift That Keeps on Giving
After the 2009 Colgan regional airline accident near Buffalo, we got the FAA 1,500 hour rule for pilot experience. Nevermind that the root cause was botched primary stall training and lack of sleep …...
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PagerDuty Summit Conference 2016 SF
I went to the complimentary PagerDuty Summit Sept. 13 on Market Street in SF. The well-organized conference format was 2 tracks downstairs, with breaks and a small expo area upstairs. Andrew Fong of...
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REST API Client Computer Languages and Frameworks Survey
I recently wrote REST API client programs in several programming languages as a subproject of my Perl REST API Framework, and had some surprises, both good and bad. I would have gladly just linked to...
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I found jMeter, however, really easy to use.
So, let me get this straight … Java is not safe for use in servers because of GC pauses. And it’s not safe for use in clients because of GC pauses. Doesn’t leave much left! Thanks to Greg Lindahl,...
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Solving Java GC Pause Outages in Production
Just thinking about howto configure HAProxy with two backend Java servers to be HA. Java programs do pauses for garbage collection, known as “GC Pauses.” The description “Stop the World” (STW)...
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Linux Graceful Service Shutdown Techniques
When doing server upgrades with multiple servers, the ideal way is to: 1. take one instance out of the pool 2. drain connections on it 3. upgrade it 4. put it back into the pool 5. back to #1. The...
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Linux rkt on CentOS7 is Just Too Easy
The rkt (pronounced “rocket”) container manager is just too easy to run on CentOS7! Here’s me running a Docker Ubuntu 16.04.1 LTS image on CentOS7 (Dell 1950 III with 8 GB RAM) for the first time in...
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How to Build Linux rkt Container Manager on CentOS 6.7
Installing the rkt container manager on CentOS 6.x with yum will give you this error: # yum -y install go rkt # rkt run rkt: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by rkt) glibc is...
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Basic JMeter Load Testing of Web Sites and Rest APIs
This is an intro to load testing with Apache JMeter, an Open Source load testing tool. As a developer, QA or Operations engineer, it’s important to be familiar with what load testing tools can do, and...
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The first ever photograph of light as both a particle and wave
Magnified image of electrons interacting with a standing photonic wave along a thin wire. The standing wave shows the wave nature of light, and the coloration measures the change in velocity as...
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Linux HTTP Load Testing with httperf
httperf is an easy-to-use but powerful GPL2 command line (CLI) stress and load testing tool for linux. Installing httperf CentOS 6: yum install httperf CentOS 7: wget...
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