State of Supercomputers around the World in 2026
An update to the 2024 post, based on the November 2025 TOP500 list and the IMF October 2025 World Economic Outlook (2026 forecast).
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How to Build GHDL on Apple M
Steps to build GHDL on Apple M silicon.
A Minimum Complete Tutorial of Portable Document Format (PDF) with pdfsh
What is a PDF file ?
Using a Pico 2 RP2350 without the Pico SDK Build System
How to develop a C application for Pico 2 and RP2350 without the Pico SDK build system
Lustre 2.15.4 on RHEL 8.9 and Ubuntu 22.04
How to install Lustre 2.15.4 on RHEL 8.9 as a server and Ubuntu 22.04 as a client.
State of Supercomputers around the World
THAT: THe Analog Thing
A short review of the Analog Thing.
Thoughts on MCU/Embedded Register and Field Access Patterns
Solution to LOAD segment with RWX permissions warning with CMSIS
A describe my solution to the warning, load segment with RWX permissions, when using CMSIS linker script.
Demystifying Arm Cortex-M33 Bare Metal: Compile, Assembly and Link
A description of the build and the link settings of a Cortex-M33 bare metal application.
PM2.5 and VOC Emission in 3D Printing
A basic experiment at home measuring the PM2.5 and VOC emissions of 3D printing.
Demystifying Arm Cortex-M33 Bare Metal: Startup
Explaining what happens after a reset in Cortex-M33.
Tape Backup for TrueNAS Core
How to backup TrueNAS Core to a tape
Demystifying Arm GNU Toolchain Specs: nano and nosys
A detailed overview of nano and nosys specs in Arm GNU Toolchain.
A minimum complete introduction to ESA's Euclid Mission
Euclid is a pretty amazing space mission like many others. I challenge myself in this post, and I try to explain the Euclid mission. By using the Euclid mission as an example, I hope to say something new for anybody reading this post.
Measuring the Power Consumption of an ARM Cortex-M0 MCU: STM32F072
This post is about power management, sleep modes and actual measured power consumption of an ARM Cortex-M0 processor. I will first give brief technical information regarding ARM Cortex-M0 and STM32F072 power management. Then, I will show the code examples and the current measurements.
CADR LISP Machine and CADR Processor
A description of MIT CADR LISP Machine, CADR Processor and CADR emulator usim
AlphaServer and Tru64 UNIX in 2023
I have purchased an AlphaServer DS10, and I describe how to start using this computer.
Installing OpenSSH on Tru64 UNIX 4.0F
How to install OpenSSH server on Tru64 UNIX 4.0F
Adventures with Linear Tape-Open (LTO) at Home in 2023
I started using an LTO-5 drive for personal backups. I described the pros and cons in this post.
DPDK 22.11 LTS and TRex on PC Engines apu4d4 running Ubuntu 22.04 LTS
How to use DPDK 22.11 and TRex on PC Engines apu4d4 running Ubuntu 22.04.
Work-In-Progress: Studying Ethernet Physical Layer 1
Studying Ethernet Physical Layer 1
Building DPDK 22.11 and Using TRex with ConnectX-3 Pro (mlx4) on Ubuntu 22.04
The steps to build DPDK 22.11 with mlx4 driver on Ubuntu 22.04. Also which version of Trex to use.
A note on DHCPv6 DUID and Prefix Delegation
A note and clarification regarding to use of DHCPv6 DUID and prefix delegation
Choosing a Programmable (Logic) Controller (PLC) for Experimentation
How to choose a PLC for experimentation. Quick summary of SIMATIC S7-300.
SIMATIC S7-300 CPU 314 Response Time
A simple measurement of CPU 314 response time.
A List of Small Mod(ification)s and Fixes
A list of small mods and fixes I made.
Notes about Rega RP3 Upgrades
Notes about some upgrades I made to Rega RP3 turntable.
AMD EPYC 7313P Energy Consumption Test
Here are some energy consumption tests I performed with AMD EPYC 7313P.
A Minimum Complete Example of Debian Packaging and Launchpad PPA: hellodeb
A very basic but complete Debian packaging tutorial with a sample project.
Review of QNAP QSW M Series 10G Switches
Very short review of QNAP QSW M series 10G switches
AMD EPYC 7313P and Supermicro H12SSL NUMA Topology
AMD EPYC 7313P and Supermicro H12SSL NUMA Topology
Building a Home Lab Server in 2022
A home lab server build with AMD EPYC.
Notes on selecting and using a QNAP NAS at home
Best practices on using a QNAP NAS for advanced home users.
How a NIC receives a packet: PC Engines apu4d4 Packet-per-Second Throughput
Explaining how a NIC works on Linux and also testing the packet per second throughput of PC Engines apu4d4
Install and Configure DPDK on PC Engines apu4d4
How to install and configure Data Plane Development Kit (DPDK) on PC Engines apu4d4
Upgrading the Home Network to 10G
How I upgraded my home network to 10G ?
Tektronix SD-24 TDR/Sampling Head Teardown
Tektronix SD-24 Teardown
Z0 Probe
a Z0 probe experiment
STM32H7 (Cortex-M7) GPIO toggling
Experiments with GPIO toggling in STM32H7
Demystifying a very simple TrustZone enabled program on ARM Cortex-M33
This is an explanation of a simple TrustZone enabled program on ARM Cortex-M33.
A Simple and Cheap but Powerful Heartbeat Fault Detector for Intranet
Do you need a heartbeat based fault detector system for your intranet ?
Accuracy of GroLine pH/EC Sensor after Single Point Calibration
How accurate is a single point calibration ?
Making a high quality and modular pinhole lens
This is how I made a pinhole lens.
Shutter Lag Measurement of Fuji X-H1 and Sony A7RII with StopShot
I have measured the shutter lag of Fuji X-H1 and Sony A7RII using StopShot.
Measuring the resolution of Fuji X-T2
Here is a measurement of the resolution of Fuji X-T2.
Measuring Thorlabs P300D Precision Pinhole
Pinhole diameter measurement of Thorlabs P300D
Measuring Light for Indoor Plants: Using i1Studio as a PAR PPFD Meter
Can I grow tomatoes indoors ? What about lettuce ? I measured the indoor light conditions in this post.
Rohde & Schwarz RTB2004
If you are looking for an oscilloscope, I wrote why I chose RTB2004.
Software Reaction Time: Introduction
How to measure the latency of software interacting with the real world ?