I am Lao Wen, an embedded engineer who loves learning.Follow me, and let’s become better together! The Memory Copy Function memcpy memcpy is short for memory copy, which means copying memory. We often use it when writing C programs. Its function prototype is as follows: void *memcpy(void *dest, const void *src, size_t n); Its function … Read more
Basic Usage of String Arrays In C++, we can use character arrays to store and manipulate strings. Here are two of the most common methods to initialize string arrays. Method 1: Initialize with String Literals #include <iostream> #include <cstring> // Provides string functions like strlen() int main() { // Method 1: Initialize with string literals … Read more
Understanding the Differences Between Buffer and Cache in Linux “Why does my free command show so much memory usage, yet the system is not slow?”“Can both Buffer and Cache be released?”“Is Linux stealing my memory?” Many newcomers to Linux are often puzzled when they see the memory usage of the system. This article aims to … Read more
In the process of Linux system operation and maintenance, performance optimization is a crucial task. Disk I/O performance is often one of the key factors affecting the overall performance of the system. To accurately grasp the status of disk I/O, it is necessary to use some practical tools, and the iostat command is one of … Read more
Click the blue text above 【AnTuTu】 to follow me Sharing technology hotspots every day! On March 2, Meizu not only launched the new version of Flyme 9 today but also surprisingly introduced the Flyme for Watch operating system. Regarding this Meizu smartwatch, it was officially announced last year that it would be released in Q4 … Read more
1. Problem Analysis We need to write a subroutine that displays a given byte of data in hexadecimal format at the center of the screen. One byte should be represented by two hexadecimal characters, corresponding to the high 4 bits and low 4 bits of the value. Key Points: Separate the high 4 bits and … Read more
How to Run Linux Containers on macOS Using Docker Desktop Docker Desktop is the most convenient solution for running containers on macOS, supporting the direct execution of Linux containers. After installing Docker Desktop, the system automatically creates a lightweight Linux virtual machine (based on HyperKit), requiring no manual configuration. You can directly pull and run … Read more
A Complete Guide to Bit Manipulation in C 1. Basic Concepts of Bit Manipulation Bit manipulation is a technique that directly operates on the binary bits of integers in memory. The C language provides six bitwise operators: 1. Bitwise AND (&): The result is 1 when both corresponding bits of the operands are 1. 2. … Read more
0. Introduction There are two common ways to improve efficiency: one is to increase concurrency, and the other is to increase data throughput.In previous articles, we discussed multithreading concurrency, which is a common method for increasing concurrency; this article will introduce SIMD, which is related to increasing data throughput, allowing for the processing of more … Read more
NIC Device Driver Tuning NIC Device Driver Typically, the device driver versions included with Linux distributions are outdated and may not support all the latest features. This page provides information on updating device drivers. To check the current driver version, execute the following command: ethtool -i ethN The command ethtool -i ethN is used in … Read more