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CODE FARM

Parallel programming in .NET

24 Dec 2023

"Concurrency is about dealing with lots of things at once. Parallelism is about doing lots of things at once." — Rob Pike 1. Threads and threading Multithreading can be used to increase the responsiveness of an application and, if an application runs on a multiprocessor or multi-core system, increase its throughput. [1]...
What is HTTP/2

20 Dec 2023

Why HTTP/2 is faster? * HTTP/2.0 introduces several features that improve the speed and performance of web communication as compared to HTTP/1.1. Here are the key enhancements that make HTTP/2 faster: Multiplexing: One of the biggest improvements in HTTP/2 is multiplexing, which allows multiple messages to be sent back-and-forth at...
Garbage Collection in .NET

26 Nov 2023

In the common language runtime (CLR), the garbage collector (GC) serves as an automatic memory manager to manages the allocation and release of memory for an application. [1] All processes on the same computer share the same physical memory and the page file, if there’s one. Each process has its...
Let’s Encrypt

17 Aug 2023

The following sections are generated by Azure OpenAI with ChatGPT 4. 1. Introduction Let’s Encrypt is a widely used Certificate Authority (CA) that provides free SSL/TLS certificates for websites and applications. It was founded in 2014 by the Internet Security Research Group (ISRG), a non-profit organization with a mission to...
Node.js, NPM, NVM

27 Jul 2023

1. Node.js Node.js is an open-source and cross-platform JavaScript runtime environment, that runs the V8 JavaScript engine, the core of Google Chrome, outside of the browser. [1] V8 is the name of the JavaScript engine that powers Google Chrome. It’s the thing that takes our JavaScript and executes it while...
What is NVMe and PCIe

21 Jul 2023

NVM Express (NVMe) or Non-Volatile Memory Host Controller Interface Specification (NVMHCIS) is an open, logical-device interface specification for accessing a computer’s non-volatile storage media usually attached via the PCI Express bus. 1. What is PCI Express? PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe or PCI-e, is a...
What is OpenTelemetry

11 Jul 2023

As modern application environments are polyglot, distributed, and increasingly complex, observing your application to identify and react to failures has become challenging. In early 2019, two popular instrumentation projects, OpenTracing and OpenCensus, merged to create OpenTelemetry, a new standard for observability telemetry. [1] OpenTelemetry is a collection of APIs, SDKs,...
What is PowerShell

06 Jul 2023

PowerShell is a cross-platform task automation solution made up of a command-line shell, a scripting language, and a configuration management framework. PowerShell runs on Windows, Linux, and macOS. [1] Commands for PowerShell are known as cmdlets (pronounced command-lets). In addition to cmdlets, PowerShell allows you to run any command available...
Character encoding, ASCII, Unicode

30 Jun 2023

1. Character encoding Character encoding is the process of assigning numbers to graphical characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using digital computers. The numerical values that make up a character encoding are known as code points and collectively comprise a...
How to develop in C programming language on Linux

26 Jun 2023

1. Linux Programming and Tools There are several useful tools in the C programming toolchain on Linux. Here’s a list of some of the most important and widely-used tools: GCC (GNU Compiler Collection): GCC is a widely-used compiler for C, C++, Objective-C, Fortran, Ada, and other languages. It compiles, assembles,...
Intro to SQL Server Database

06 Apr 2023

1. Deploy and connect to SQL Server Linux containers In this quickstart, you’ll use Docker to pull and run the SQL Server 2022 (16.x) Linux container image, mssql-server-linux. Then you can connect with sqlcmd to create your first database and run queries. 1.1. Pull and run the SQL Server Linux...
OpenGPG, GnuPG and SecureApt

15 Mar 2023

OpenPGP is a non-proprietary format for authenticating or encrypting data, using public key cryptography. [opengpg] It is based on the original PGP (Pretty Good Privacy) software. Beginning in 1997, the OpenPGP Working Group was formed in the Internet Engineering Task Force (IETF) to define this standard that had formerly been...
DHCP Options in VMware

06 Mar 2023

Edit vmnetdhcp.conf at %ProgramData%\VMware\vmnetdhcp.conf The following is a sample which was reconfigured the DHCP subnet from 192.168.227.0/24 to 192.168.91.0/24. # # Configuration file for VMware port of ISC 2.0 release running on # Windows. # # This file is generated by the VMware installation procedure; it # is edited each...
TCP/IP: Security: EAP, IPsec, TLS, DNSSEC, and DKIM

24 Feb 2023

There are three primary properties of information, whether in a computer network or not, that may be desirable from an information security point of view: confidentiality, integrity, and availability (the CIA triad) [L01], summarized here: Confidentiality means that information is made known only to its intended users (which could include...
Entity Framework in .NET

10 Feb 2023

Entity Framework (EF) Core is a lightweight, extensible, open source and cross-platform version of the popular Entity Framework data access technology, which can serve as an object-relational mapper (O/RM). [1] With EF, data access is performed using a model, which is made up of entity classes and a context object...
TCP/IP: TCP Keepalive

08 Feb 2023

Under some circumstances, it is useful for a client or server to become aware of the termination or loss of connection with its peer. In other circumstances, it is desirable to keep a minimal amount of data flowing over a connection, even if the applications do not have any to...

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