Hoya Shin hoyacom

Tips and Tricks for Jetson AGX Xavier

This document contains useful software and links to documentation that we have found to be useful when working with Jetson AGX Xavier.

Copied from: https://git.its.aau.dk/WW82ZE/docs_xavier/src/branch/master

Links

Nvidia Developer forum Jetson AGX Xavier topic

https://forums.developer.nvidia.com/c/agx-autonomous-machines/jetson-embedded-systems/jetson-agx-xavier/75

Jetson Community Projects

Application을 구현하면서 대부분 요구사항에 명시되는 기능이 변경사항 추적이다. 이때 변경 사항을 추적하기 위해 필요한 데이터는 누가 언제 생성하였으며, 누가 언제 변경하였는지 그리고 해당 데이터의 시점에 따른 변경 이력이다.

전통적인 Mybatis를 이용하는 Spring MVC와 같은 프레임워크에선 AOP를 이용한다던지 또는 Mapper에서 Insert, Update, Delete 쿼리를 실행할 때마다 History table에 Insert하는 쿼리를 같이 실행 하도록 처리하는 등의 방법이 있다. 이러한 방법을 사용할 때 생각보다 개발 일정을 지연시키는 요소가 많다.

예를들어 History 테이블의 PK를 잘못 지정하여 발생하는 예외나 DBMS마다 상이한 다량의 쿼리문 실행 문법 등이다. 전자는 개발 단계보다 UAT 기간 등에서 발견하기 쉬울 뿐더러 모든 대상 테이블을 돌면서 Schema를 변경해야 하는 번거로움이 있다.

Debugging ES6 in VS Code

My current editor of choice for all things related to Javascript and Node is VS Code, which I highly recommend. The other day I needed to hunt down a bug in one of my tests written in ES6, which at time of writing is not fully supported in Node. Shortly after, I found myself down the rabbit hole of debugging in VS Code and realized this isn't as straightforward as I thought initially. This short post summarizes the steps I took to make debugging ES6 in VS Code frictionless.

What doesn't work

My first approach was a launch configuration in launch.json mimicking tape -r babel-register ./path/to/testfile.js with babel configured to create inline sourcemaps in my package.json. The debugging started but breakpoints and stepping through the code in VS Code were a complete mess. Apparently, ad-hoc transpilation via babel-require-hook and inline sourcemaps do not work in VS Code. The same result for attaching (instead of launch) to `babel-node

	This method uses the modern systemd way to run a Java JAR (i.e. a Spring Boot app) as a daemon as opposed to using the older method of using init.d (SystemV). Using the "&" symbol to run the process in the background isn't sufficient b/c the process will be shut down when the terminal closes (or when you exit your SSH session if remoting in to the machine). Using the "nohup" command is another option, but that is like the "poor man's way" of running a service: doesn't restart on machine reboot; program ignores interrupts, quit signals, and hangups. For more info see: https://stackoverflow.com/questions/958249/whats-the-difference-between-nohup-and-a-daemon .

	Anyways, to create a Linux daemon the systemd way:

	Create a service file in /etc/systemd/system. Let's call it javaservice.service. Let the contents be:

	[Unit]
	Description=My Java Service

	[Service]

	#!/bin/bash

	#
	# Script to create MySQL db + user
	#
	# @author Raj KB <[email protected]>
	# @website http://www.magepsycho.com
	# @version 0.1.0

	################################################################################

	<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
	http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	version="3.1">
	</web-app>


	var net = require('net');

	// creates the server
	var server = net.createServer();

	//emitted when server closes ...not emitted until all connections closes.
	server.on('close',function(){
	console.log('Server closed !');
	});

	#!/bin/bash
	/usr/bin/osascript - $1 2>/dev/null << EOF
	on run argv
	set newpath to (do shell script "echo $PATH")
	set path_cd to ""
	repeat with n from 1 to count of argv
	set path_cd to path_cd & item n of argv & ASCII character (92) & " "
	end repeat
	set path_cd to text 1 thru -3 of path_cd
	tell application "iTerm"

	export FZF_DEFAULT_COMMAND="rg --files --no-ignore-vcs --glob '!/{.git,node_modules}/*'"
	export FZF_CTRL_T_COMMAND="rg --files --no-ignore-vcs --glob '!/{.git,node_modules}/*'"
	export FZF_ALT_C_COMMAND="fd --type d --no-ignore-vcs --exclude node_modules --exclude .git"