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CitrixAI Architect

Apple's New M1 Processor: RISC vs. CISC Architecture

Apple's New M1 Processor: RISC vs. CISC Architecture

Apple has now released the M1 Apple Silicon chips, and after all the fuzz you may be wonder what makes it different from an intel or AMD processor? You have probably heard M1 referred to as an ARM processor and that ARM is a so called RISC processor, unlike x86

Visualizing JavaScript: Event Loops

Visualizing JavaScript: Event Loops

Event Loops! It’s one of those things that every JavaScript developer has to deal with in one way or another, but it can be a bit confusing to understand at first. I understand the importance of visual learning to many individuals, so I thought I’d try to help

Wrote some code to production and fried an entire server

Wrote some code to production and fried an entire server

This post is about perils of concurrency and race conditions. My code was nearly correct, but ultimately, there were two major synchronization bugs that killed it. This is a really long post that gets into the weeds at times, but I have tried to write it so that you can

Mechanism of what really happens when you type ls -l in the shell

Mechanism of what really happens when you type ls -l in the shell

What (really) happens when you type ls -l in the shell To understand what (really) happens when you type ls -l in the shell, you have to understand what the shell is, in relation to the kernel. The kernel is the central, most fundamental part of a computer operating system.

How Students Hacked Blackboard and Changed Their Grades

How Students Hacked Blackboard and Changed Their Grades

Please note: this occurred in 2018, and has been properly patched and archived. The vulnerabilities were immediately reported to Blackboard and the NTNU Security Operations Center on the 9th of February 2018. They were confirmed patched 61 days later. How did the Blackboard exploit work? A student (attacker) submits an

Setting up Wireguard VPN with OpenBSD from Scratch

Setting up Wireguard VPN with OpenBSD from Scratch

OpenBSD-current recently got native support for the Wireguard® VPN, thanks to the work of Matt Dunwoodie and Jason A. Donefeld. Their code was merged by David Gwynne. This is great, especially since I’ve been using WireGuard for various purposes already. A local assocative ISP here in Toulouse is offering

How to Build a Highly Available System Using Consensus

How to Build a Highly Available System Using Consensus

One of many timeless works from Butler Lampson. The patterns are still widely in use to this day. The trade offs between lease times and availability are clearly defined; reading this could save a lot of hard earned lessons. This paper is such a great top-down explanation of consensus and