Andrew Johnston billywhizz

Make Ubuntu packages 90% faster by rebuilding them

TL;DR

You can take the same source code package that Ubuntu uses to build jq, compile it again, and realize 90% better performance.

Setting

I use jq for processing GeoJSON files and other open data offered in JSON format. Today I am working with a 500MB GeoJSON file that contains the Alameda County Assessor's parcel map. I want to run a query that prints the city for every parcel worth more than a threshold amount. The program is

vsock notes

about vsocks

Vsocks are a means of providing socket communication (either stream or datagram) directly between VMs and their host operating system. The host and each VM have a 32 bit CID (Context IDentifier) and may connect or bind to a 32 bit port number. Ports < 1024 are privileged ports.

Vsock communication between VMs does not seem to work.
Only one vsock device per VM is supported.

Most active GitHub users (git.io/top)

The list would not be updated for now. Don't write comments.

The count of contributions (summary of Pull Requests, opened issues and commits) to public repos at GitHub.com from Wed, 21 Sep 2022 till Thu, 21 Sep 2023.

Because of GitHub search limitations, only 1000 first users according to amount of followers are included. If you are not in the list you don't have enough followers. See raw data and source code. Algorithm in pseudocode:

githubUsers

☁️ How I got off the cloud and migrated everything from AWS to a VPS in Hetzner

This is an opinionated handbook on how I migrated all my Rails apps off the cloud and into VPS.

This is how I manage real production loads for my Rails apps. It assumes:

Rails 7+
Ruby 3+
PostgreSQL
Ubuntu Server 24.04
Capistrano, Puma, Nginx

	all: default

	default: waitpid waitpid_optimized

	waitpid: waitpid.c Makefile
	$(CC) -Wall -Werror -std=gnu17 -ggdb -o waitpid waitpid.c

	waitpid_optimized: waitpid.c Makefile
	$(CC) -Wall -Werror -std=gnu17 -Ofast -o waitpid_optimized waitpid.c

	#include <stdint.h>
	#include <stdlib.h>
	#include <stdbool.h>
	#include <windows.h>
	#pragma comment( lib, "user32.lib" )
	#pragma comment( lib, "gdi32.lib" )

	#define SCRW 640
	#define SCRH 480

	#include <stdlib.h>
	#include <stdio.h>

	#include <sys/ipc.h>
	#include <sys/shm.h>

	#include <xcb/xcb.h>
	#include <xcb/shm.h>
	#include <xcb/xcb_image.h>

	// First, let's look at the traditional visitor pattern
	// This is how we might implement a simple expression evaluator

	// Traditional Visitor Pattern
	namespace Traditional {
	// Abstract base class for expressions
	abstract class Expr {
	abstract accept<T>(visitor: ExprVisitor<T>): T;
	}

	#!/bin/bash
	TARGETDIR=$1
	if [ "$TARGETDIR" = "" ]; then
	TARGETDIR=$(python -c 'import os; print os.path.realpath("local")')
	fi
	mkdir -p $TARGETDIR

	libevent() {
	curl -LO https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz
	tar -zxvf libevent-2.0.22-stable.tar.gz

	#include <stdio.h>
	#include <sys/inotify.h>
	#include <sys/time.h>

	#include <sys/epoll.h>
	#include <errno.h>

	#include <linux/memfd.h>
	#include <sys/mman.h>
	#include <sys/syscall.h>