Linux

How “real-time” are the FIFO/RR schedulers on non-RT Linux kernel?

由 一世执手 提交于 2021-02-20 03:44:55
问题 Say on a non-RT Linux kernel (4.14, Angstrom distro, running on iMX6) I have a program that receives UDP packets (< 1400 bytes) that come in at a very steady data rate. Basically, the essence of the program is: while (true) { recv( sockFd, ... ); update_loop_interval_histogram(); // O(1) } To minimize the maximally occuring delay time (loop intervals), I started my process with: chrt --fifo 99 ./programName setting the scheduler to a "real-time" mode SCHED_FIFO with highest priority. the CPU

capturing mouse event in C (linux)

由 南笙酒味 提交于 2021-02-20 03:42:23
问题 I'm writing a little mouselogger in basic C for linux. I search mouse event in linux/input.h, but I have not found anything about this. struct input_event { struct timeval time; __u16 type; __u16 code; __s32 value; } With the struct input_event , I can capturing which button was pressed on mouse and when she move, but not his position. ( I separate the field value in two __s16 variable, but is not a position). If anyone know a structure where I can access this, or a specific file to listen

Hugo version not updating to latest

由 寵の児 提交于 2021-02-20 02:51:31
问题 I am trying to work with the Hugo static site generator. Problem: Hugo is saying it is updated to the latest version but it is not. $ hugo version Hugo Static Site Generator v0.40.1 linux/amd64 BuildDate: 2018-04-25T17:16:11Z But the latest version is now v0.70.0 System: Windows Subsystem for Linux via the terminal in Visual Studio Code v1.45.0 Any help would be much appreciated thank you all. 回答1: If you've installed it via the apt package manager, you might be out of luck there, because the

Run Linux command in background and keep runing after closing SSH [duplicate]

由 杀马特。学长 韩版系。学妹 提交于 2021-02-20 01:35:53
问题 This question already has answers here : How to make a programme continue to run after log out from ssh? [duplicate] (6 answers) Closed 1 year ago . I need to run a Perl script for several days processing something. On a linux Centos server, from the SSH terminal I run this command: nohup perl script.cgi 2>&1 & This runs the script in the background and writes the output to nohup.out. The problem when I close the SSH terminal or even my internet connection disconnects the script terminates. I

Run Linux command in background and keep runing after closing SSH [duplicate]

由 此生再无相见时 提交于 2021-02-20 01:35:33
问题 This question already has answers here : How to make a programme continue to run after log out from ssh? [duplicate] (6 answers) Closed 1 year ago . I need to run a Perl script for several days processing something. On a linux Centos server, from the SSH terminal I run this command: nohup perl script.cgi 2>&1 & This runs the script in the background and writes the output to nohup.out. The problem when I close the SSH terminal or even my internet connection disconnects the script terminates. I

实用的Linux命令行工具

由 孤者浪人 提交于 2021-02-20 01:12:36
这些命令将让您的Linux使用体验更简单……或者，至少更有趣。 Linux世界中包含着无数令人印象深刻的免费与开源工具，大家能够利用其完成自己甚至从未想到过的功能。在今天的文章中，我们将分享七项您可能从未听说，但却相当出色的工具——从文件系统监控到运行可重新连接ssh会话皆在其中。 Linux世界中包含着无数令人印象深刻的免费与开源工具，大家能够利用其完成自己甚至从未想到过的功能。在今天的文章中，我们将分享七项您可能从未听说，但却相当出色的工具——从文件系统监控到运行可重新连接ssh会话皆在其中。 如果大家以ssh方式接入Linux主机并需要长时间执行操作，例如软件编程，那么您可能会丢失连接并因此退出登录。在这种情况下，tmux能够帮上大忙——tmux是一款终端复用器，它允许大家在同一终端的各程序之间轻松切换，将其断开(程序仍运行在后台当中)并重新附加至其它终端当中。正因为如此，tmux已经成为众多Linux系统管理员的必备工具。 如果大家以ssh方式接入Linux主机并需要长时间执行操作，例如软件编程，那么您可能会丢失连接并因此退出登录。在这种情况下，tmux能够帮上大忙——tmux是一款终端复用器，它允许大家在同一终端的各程序之间轻松切换，将其断开(程序仍运行在后台当中)并重新附加至其它终端当中。正因为如此，tmux已经成为众多Linux系统管理员的必备工具。 多年以来

golang介绍及环境搭建

由 夙愿已清 提交于 2021-02-20 00:50:08
一、golang介绍 1. 语言介绍 Go 是一个开源的编程语言，它能让构造简单、可靠且高效的软件变得容易。 Go是从2007年末由Robert Griesemer, Rob Pike, Ken Thompson主持开发，后来还加入了Ian Lance Taylor, Russ Cox等人， 并最终于2009年11月开源，在2012年早些时候发布了Go 1稳定版本 。现在Go的开发已经是完全开放的，并且拥有一个活跃的社区。 Go 语言是谷歌为充分利用现代硬件性能又兼顾开发效率而设计的一种全新语言。 Go 是一种跨平台（Mac OS、Windows、Linux 等）静态编译型语言 。拥有媲美 C 语言的强大性能，支持静态类型安全，在普通计算机上能几秒内快速编译一个大项目，开发效率跟动态语言相差无几。 Go 语言在国内拥有非常活跃的社区、不仅大公司的 Go 项目越来越多，中小公司也都在考虑 Go 的应用。当前 Go 语言主要应用于后端服务的开发，未来随着 Go 项目的完善，在系统、游戏、UI界面、AI、物联网等领域，都将被广泛使用。 当然 Go 语言有优点也有一些缺点，完美的东西毕竟太少，如果看好 Go 的未来发展，那么不如抛开成见先来体验一番。 2. 特性说明 跨平台即最终可以执行到Windows，Linux，Unix等操作系统； 静态语言 ：1）编译工具代码感知更友好；2

Linux bash script to find and delete oldest file with special characters and whitespaces in a directory tree if condtion is met

由 和自甴很熟 提交于 2021-02-20 00:47:08
问题 I need some help building a linux bash script to find and delete oldest file with special characters and white spaces in a directory tree if condtion is met. I have been searching the forum for questions like this and thanks to users here I came with output as seen under. So far I can't figure out how to pipe the output filename to rm, so that it is being deleted. The goal is to check if hdd is running full, and if so delete the oldest file until free-space requirement is met. The problem is,

Linux bash script to find and delete oldest file with special characters and whitespaces in a directory tree if condtion is met

由 ￡可爱￡侵袭症＋ 提交于 2021-02-20 00:44:18
问题 I need some help building a linux bash script to find and delete oldest file with special characters and white spaces in a directory tree if condtion is met. I have been searching the forum for questions like this and thanks to users here I came with output as seen under. So far I can't figure out how to pipe the output filename to rm, so that it is being deleted. The goal is to check if hdd is running full, and if so delete the oldest file until free-space requirement is met. The problem is,

Why is this int $0x10 BIOS INT not working on Linux?

由 隐身守侯 提交于 2021-02-20 00:43:42
问题 I am not sure if I am doing something drastically wrong. I am learning assembly language in AT&T syntax on a linux machine with intel chip. I learned that INT 10H is used to invoke BIOS subroutines for various video purposes. I wrote this simple assembly code to clear the screen. .section .data data_items: .section .text .global _start _start: mov $6, %ah # to select the scroll function mov $0, %al # the entire page mov $7, %bh # for normal attribute mov $0, %ch # row value of the start point
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