In a previous post, I wrote a bit about how Ruby objects are laid out in memory. Today we’ll use that information to write a program that will allow us to take a Ruby heap dump and visualize the layout and fragmentation of that heap. Ruby Object Layout Recap Just as a recap, Ruby objects are fixed width. That is…
In this post, I'll describe some common pitfalls regarding the use of the 'time-travel' features of Datomic ( db.asOf() , db.history() , :db/txInstant ).
This post is by Guy Shrubsole. Updated 16th Dec 2017 with post-script on Birmingham’s secret tunnels. The existence of a secret network of Cold War-era tunnels beneath central London can be …
In many information systems, we work with arrays of integers. For example, maybe you need to keep track of which records in a database contain a given value. This sort of mapping can be expressed as an array of integers. These arrays can end up taking up a large fraction of your memory or disk … Continue reading…
Today is Y Combinator’s 25th Demo Day. With 124 companies presenting over the next two days, this is the largest Demo Day in YC’s 12.5 year history. We wanted to share some stats about YC and about the batch. For the more visually inclined, see the graphic below created by YC alum SketchDeck…
We’re pleased to announce the availability of RethinkDB 2.3.6, the first release since RethinkDB transitioned to community governance. This update includes a range of bugfixes and stability improvements. For a complete list of changes in this update, you can refer to the release notes .
Artwork is the first instance of personalizing not just what we recommend but also how we recommend.
By OMKAR MURALIDHARAN, NIALL CARDIN, TODD PHILLIPS, AMIR NAJMI Given recent advances and interest in machine learning, those of us with tr...
This is a guest post by Dana Van Aken, Andy Pavlo, and Geoff Gordon of Carnegie Mellon University. This project demonstrates how academic researchers can leverage our AWS Cloud Credits for Research Program to support their scientific breakthroughs. Database management systems (DBMSs) are the most important component…
Yesterday, I discovered an experimental Big Data processing framework written in C++ called Thrill. As most of you surely know, the well-known frameworks of this kind are mostly based on JVM, like …
Let’s get straight to the point; choose an SQL database for your web application. I think I can’t make my self clearer.
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I’ve added a faceted search engine to this blog, powered by PostgreSQL. It supports regular text search (proper search, not just SQL“like” queries), filter by tag, filter by date, filter …
Benchmarks & Tips for Big Data, Hadoop, AWS, Google Cloud, PostgreSQL, Spark, Python & More...
Once a month users post a chart on `r/ethereum` predicting the blockchain size of Ethereum will soon exceed 1 TB. I want to clean up with some stories around the Ethereum-blockchain size in this article and try to explain why this chart is technically correct, but not the full picture...
