billywhizz

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

billywhizz

#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

billywhizz

#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>

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

billywhizz

// 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;
  }

billywhizz

#!/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

billywhizz

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.

billywhizz

see the changes

• https://github.com/nodejs/node/compare/main...billywhizz:node:master?expand=1

caveats

• this is just PoC code. not meant to represent a desired api. just enough to get things to work on linux.
• this technique will only work on linux but there are possibly other techniques that would work on macos and windows. more to follow.
• it will only work if procfs is mounted. dlopen is called with the path /proc/self/${fd} with the fd from memfd_create
• you will still have to deal with the issue of any external dependencies of the node addons you want to embed in the SEA

billywhizz

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

billywhizz

#!/bin/bash
git clone https://github.com/just-js/lo.git
cd lo/
make lo
export LO_HOME=$(pwd)
./lo build binding bestlines
cd ..
lo/lo build runtime test-dlopen
./test-dlopen