MariaDB now supports temporal data tables in the form of
system-versioning tables (allowing you to query and operate on
historic data), application-time periods (allow you to query and
operate on a temporal range of data), and bitemporal tables (which
combine both system-versioning and application-time periods).
In the afternoon we visited my brother to celebrate his birthday,
which is actually tomorrow, and to meet the female kitten his daughter
got as a present; Puck.
Both Adam and Alice played a lot with this little cat, to her
delight. She's very playfull and wants attention all the time.
Apple Silicon: The Passing of Wintel
We’re about to enter an exciting, messy transition. Not only will
Apple Silicon make better Macs, it will force Microsoft to polish
its Windows on ARM act, both hardware and software. In turn, this
will cause PC OEMs to reconsider their allegiance to x86 silicon…and
that will have serious consequences for the old Wintel partnership.
Sometimes, we would like to compress one or several files into one
zipped file or decompress a zipped file. It is very common to use
tools such as gzip, zip, or 7zip to create or decompress .gz,
.zip, and .7z files, respectively. However, none of these tools
on Linux uses multicore and multithread during compression and
decompression. When the number of files are large or the file sizes
are large, compression and decompression would take a lot of time
using single thread.
Pigz is one of the parallel implementation for gzip and zip. Using
pigz could greatly save us the time spent on compression and
decompression. In this blog post, I would like to briefly discuss
how to use pigz.
Any traditional introductory statistics course will teach students
the definitions of modes, medians and means. But, because
introductory courses can’t assume that students have much
mathematical maturity, the close relationship between these three
summary statistics can’t be made clear. This post tries to remedy
that situation by making it clear that all three concepts arise as
specific parameterizations of a more general problem.
If you’ve played around with Haskell for any amount of time, you
probably know it has a M:N threading model with many Haskell threads
multiplexed by a userspace scheduler onto a few operating system
(OS) threads. Since a Haskell thread uses much less memory than an
OS thread, it becomes possible to spin up large numbers (hundreds of
thousands to millions) of Haskell threads. This threading model has
great benefits for readibility, since most programmers find it
easier to follow a linear “top-to-bottom” path through the code than
to follow along nested callbacks. There are also some drawbacks to
this approach. For example, managing blocking system calls becomes
much harder, since a thread that is doing a blocking operation
cannot serve normal workloads. There is also much more bookkeeping
to be done in the runtime, which would normally be left to the
You’ve likely heard the saying: “A jack of all trades is a master of
none.” It warns against the futility of pursuing too many
disciplines. Be a specialist, or you’ll be nothing.
It may surprise you to learn there’s actually an extended version:
“A jack of all trades is a master of none, but oftentimes better
than a master of one.” With a subtle addition, its meaning becomes
inverted to tout the benefits of being a polymath
Why is the former so common, and the latter so unknown?
The answer lies in modern society’s preference for
specialization. We’ll explore its origin, the limits it places
on workers’ freedoms, and how the polymath approach can offer a
reprieve. Finally, I’ll share my own experiences and learnings
exploring a multitude of pursuits.
The importance of testing in modern software development is really
hard to overstate. Delivering a successful product is not something
you do once and forget about but is rather a continuous recurring
process. With every line of code that changes, software must remain
in a functional state, which implies the need for rigorous testing.
The Web Server Gateway Interface (or “WSGI” for short) is a standard
interface between web servers and Python web application
frameworks. By standardizing behavior and communication between web
servers and Python web frameworks, WSGI makes it possible to write
portable Python web code that can be deployed in any WSGI-compliant
is documented in PEP
Natural causes or foul play? That’s the question Clay Edison must
answer each time he examines a body. Figuring out motives and
chasing down suspects aren’t part of his beat—not until a seemingly
open-and-shut case proves to be more than meets his highly trained
In the evening I started in Crime
Clay Edison Book 1, by Jonathan Kellerman and his son Jesse Kellerman.
GNU: A Heuristic for Bad Cryptography
If you see the letters GNU in a systems design, and that system
intersects with cryptography, I can almost guarantee that it will be
badly designed to an alarming degree.
A diff algorithm outputs the set of differences between two
inputs. These algorithms are the basis of a number of commonly used
developer tools. Yet understanding the inner workings of diff
algorithms is rarely necessary to use said tools. Git is one example
where a developer can read, commit, pull, and merge diffs without
ever understanding the underlying diff
algorithm. Having said that
there is very limited knowledge on the subject across the developer
In the evening I finished The Autumn
the final book in the Powder Mage Trilogy by Brian McClellan. I
enjoyed the book a lot, but still consider the first in this series; Promise of
Blood the best. It was a
good read, with a very good ending. I do recommend this series.
Acanthoscurria geniculata Volcano
In the early evening Adam came to me and told me his tarantula, a
juvenile female Acanthoscurria geniculata, was building something. I went
up to his bedroom to have a look.
The tarantula had been moving a lot of substrate to make its burrow
larger and shaped it like a turret, or like a volcano as I said to
Adam. Some of the substrate covered up the bottle cap that is used to
provide water, hence the very moist spot to the right of the volcano.
In this tutorial, we will go over how to use jq to transform xml
data as well as any other data format, including binary formats. The
steps assumes a basic familiarity with jq and unix shell pipelines.
Multitasking from the Linux Command Line + Process Prioritization
Did you know that you aren’t limited to working on one thing at a
time while on a Linux command line? You can actually “minimize” a
program that you are in, get back to the command line, and then
return to the program whenever you’d like.
After Perl 6's renaming to Raku, acknowledging that it really is
another language, Perl can now use number 7 without fear. It already
has claimed the newly freed territory with the announcement that
Perl 5.32 with more modern and sensible defaults is to be Perl 7.
often use these different constructs for working with arrays. This
is a reference, for myself and for others, written to augment the
Dbus and Polkit are two technologies that emanate an aura of
confusion. While their names are omnipresent in discussions, and the
internet has its share of criticism and rants about them, not many
have an actual grasp of what they actually do. In this article I’ll
give an overview of these technologies.
Object-oriented programming (OOP) is a method of structuring a
program by bundling related properties and behaviors into individual
objects. In this tutorial, you’ll learn the basics of
object-oriented programming in Python..
In the evening I modified the Makefile I use to generate this blog. I
added the --date-format argument once to tumblelog.pl and once to
tumblelog.py. Default the date-format is set to '%d %b %Y'—day
of the month, abbreviated month name, and year—but using the
aforementioned argument I changed this to '%a %d %b %Y'. This value
adds the abbreviated weekday name to the front of the date, see
The static microblog generator I wrote is available at
GitHub. Feedback is welcome.