Author Archives: Sampo J.

Benchmarking AWS t2 instances

Posted on January 9, 2016

A couple of years ago I did some benchmarking on the AWS t1.micro instances.  The t1.micro was AWS’s first performance burstable instance type, which are appropriate for non-continuous CPU usage. The CPU allocation of the t1.micro is not specified anywhere.  In practice the throttling … Continue reading →

Posted in Amazon AWS | Tagged , | 1 Comment

When to hard-code

Posted on December 13, 2014

Hard-coding is generally considered an anti-pattern and abhorred by experienced developers. Input and configuration data should be externalized from the code, or at the very least parametrized to a language constant. While working at Wellmo, I’ve come to reconsider this … Continue reading →

Posted in Coding | Tagged | Leave a comment

Backup KeePass2 database on Linux

Posted on April 11, 2014

There are several instructions on how to use the KeePass2 trigger mechanism to create a backup of your password database when saving the database.  However, all of the instructions I found were for Windows.  It took a bit of figuring … Continue reading →

Posted in KeePass, Security | Tagged | 3 Comments

Hybrid app testing using dynamic DNS

Posted on March 23, 2014

Hybrid apps simplify implementing cross-platform mobile applications in many ways.  You only need to write the HTML once, and it should work on all platforms.  However, you still need to test those platforms. At Wellmo, we do most of our … Continue reading →

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Using Spark with MongoDB

Posted on February 18, 2014

I recently started investigating Apache Spark as a framework for data mining. Spark builds upon Apache Hadoop, and allows a multitude of operations more than map-reduce. It also supports streaming data with iterative algorithms. Since Spark builds upon Hadoop and … Continue reading →

Posted in Coding, MongoDB, Spark | Tagged , | 33 Comments

CoffeeScript woes

Posted on December 22, 2013

I recently wrote a piece comparing CoffeeScript, TypeScript and Dart.  For the UI component of Wellmo, we decided upon using CoffeeScript.  While this has been a great leap from JavaScript, we’ve had our share of setbacks.  Here’s a few issues … Continue reading →

Posted in Coding, CoffeeScript | Tagged | 9 Comments

Modifying the pace of audiobooks

Posted on December 2, 2013

I’ve recently started listening to audiobooks.  They’re a convenient way to enjoy books on your way to work or while driving.  After listening to Mika Waltari’s The Egyptian, I took on The Hunger Games, read by Carolyn McCormick. Like many … Continue reading →

Posted in Coding, Ruby | Tagged , , | Leave a comment