noelbundick

Optimizing Rust container builds

I'm a Rust newbie, and one of the things that I've found frustrating is that the default docker build experience is extremely slow. As it downloads crates, then dependencies, then finally my app - I often get distracted, start doing something else, then come back several minutes later and forget what I was doing

Recently, I had the idea to make it a little better by combining multistage builds with some of the amazing features from BuildKit. Specifically, cache mounts, which let a build container cache directories for compilers & package managers. Here's a quick annotated before & after from a real app I encountered.

Before

This is a standard enough multistage Dockerfile. Nothing seemingly terrible or great here - just a normal build stage, and a smaller runtime stage.

0b10011

#!/bin/bash

# This is a drop-in replacement for `cargo`
# that runs in a Docker container as the current user
# on the latest Rust image
# and saves all generated files to `./cargo/` and `./target/`.
#
# Be sure to make this file executable: `chmod +x ./cargo`
#
# # Examples

ciiiii

# If you don‘t want to build it youself, you can try `docker pull killercai/postgres`.
FROM healthcheck/postgres:latest

# China debian mirror
RUN sed -i s@/deb.debian.org/@/mirrors.aliyun.com/@g /etc/apt/sources.list
RUN apt-get clean && apt-get update
RUN apt-get install -y wget git build-essential libpq-dev python-dev postgresql-server-dev-all
# SCWS (Simple Chinese Word Segmentation library)
RUN cd /tmp && wget -q -O - http://www.xunsearch.com/scws/down/scws-1.2.1.tar.bz2 | tar xjf - && cd scws-1.2.1 && ./configure && make install
# zhpaser (postgres plugin)

aboisvert

# Nim port of Daniel Lemire's fast newline count `avxcount` 
#
# See https://lemire.me/blog/2017/02/14/how-fast-can-you-count-lines/ 
#     https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/blob/master/2017/02/14/newlines.c

import os, memfiles, times, strutils

{.passc: "-march=native".}

{.pragma: imm, header:"immintrin.h".}

maxivak

Load lib files in production (Rails 5)

If you have your code defined in classes in lib/ folder you may have problems to load that code in production.

Autoloading is disabled in the production environment by default because of thread safety.

Change config/application.rb:

    config.autoload_paths << Rails.root.join("lib")
 config.eager_load_paths &lt;&lt; Rails.root.join("lib")

schollz

// save as index.js
// npm install https://github.com/GoogleChrome/puppeteer/
// node index.js URL
const puppeteer = require('puppeteer');

(async () => {
  const url = process.argv[2];
  const browser = await puppeteer.launch();
  // use tor
  //const browser = await puppeteer.launch({args:['--proxy-server=socks5://127.0.0.1:9050']});

ethanhuang13

//: Playground - noun: a place where people can play
//
// The result is not guaranteed to be accurate. Typically, the function requires 200-400 characters to reliably guess the language of a string.
// Reference: [CFStringTokenizerCopyBestStringLanguage(_:_:)](https://developer.apple.com/reference/corefoundation/1542136-cfstringtokenizercopybeststringl)
//

import Foundation

extension String {
    func guessLanguage() -> String {

schabluk

onDrop = (acceptedFiles, rejectedFiles) => {
  const file = acceptedFiles.find(f => f)
  const i = new Image()

  i.onload = () => {
    let reader = new FileReader()
    reader.readAsDataURL(file)
    reader.onload = () => {
      console.log({
        src: file.preview,

sbalay

import React from 'react';
import { reduxForm, Field } from 'redux-form';
import { ScrollView, Text, TouchableOpacity } from 'react-native';
import moment from 'moment';

import MyTextInput from './MyTextInput';

/**
 * Automatically adds the dashes required by the specified phone format and limits the input to ten characters
 */

radik909

defmodule Fibonacci do
  def run(num) when num > 0 do
    Stream.unfold({1, 1}, fn {a, b} ->  
      {a, {b, a + b}}
    end)
    |> Enum.take(num)
  end
end

IO.gets("Enter the limit: ")