adelarsq

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

adelarsq

// This sample will guide you through elements of the F# language.
//
// *******************************************************************************************************
//   To execute the code in F# Interactive, highlight a section of code and press Alt-Enter in Windows or
//   Ctrl-Enter Mac, or right-click and select "Send Selection to F# Interactive".
//   You can open the F# Interactive Window from the "View" menu.
// *******************************************************************************************************
//
// For more about F#, see:
//     http://fsharp.org

adelarsq

Plug 'https://github.com/mattn/webapi-vim'
Plug 'https://github.com/vim-jp/vital.vim'
Plug 'https://github.com/xolox/vim-misc'
Plug 'https://github.com/LucHermitte/lh-vim-lib'
Plug 'https://github.com/Shougo/vimproc.vim'
Plug 'https://github.com/tpope/vim-dispatch'
Plug 'https://github.com/junegunn/vim-emoji.git'
Plug 'https://github.com/arecarn/vim-selection'
Plug 'https://github.com/roxma/nvim-yarp'
Plug 'https://github.com/roxma/vim-hug-neovim-rpc'

adelarsq

local configs = require 'nvim_lsp/configs'
local util = require 'nvim_lsp/util'

configs.omnisharp = {
  default_config = {
    cmd = {'omnisharp_lsp_run','-lsp'};
    filetypes = {'cs','csx','cake','vb'};
    root_dir = util.root_pattern("Makefile");
  };
  docs = {

adelarsq

Let's Destroy C

I have a pet project I work on, every now and then. CNoEvil.

The concept is simple enough.

What if, for a moment, we forgot all the rules we know. That we ignore every good idea, and accept all the terrible ones. That nothing is off limits. Can we turn C into a new language? Can we do what Lisp and Forth let the over-eager programmer do, but in C?

---

adelarsq

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

adelarsq

OverEncrypt

This is a guide that I wrote to improve the default security of my website https://fortran.io , which has a certificate from LetsEncrypt. I'm choosing to improve HTTPS security and transparency without consideration for legacy browser support.

WARNING: if you mess up settings, lose your certificates, or decide to no longer maintain HTTPS certs, these steps can and will make your domain inaccessible.

I would recommend these steps only if you have a specific need for information security, privacy, and trust with your users, and/or maintain a separate secure.example.com domain which won't mess up your main site. If you've been thinking about hosting a site on Tor, then this might be a good option, too.

The best resources that I've found for explaining these steps are https://https.cio.gov , https://certificate-transparency.org , and https://twitter.com/konklone

adelarsq

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

adelarsq

-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20140415-2008.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20150204-1316
-product
org.eclipse.epp.package.jee.product
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
256M

adelarsq

/*<?php
//*/public class PhpJava { public static void main(String[] args) { System.out.printf("/*%s",
//\u000A\u002F\u002A
class PhpJava {
    function main() {
        echo(//\u000A\u002A\u002F
        "Hello World!");
}}
//\u000A\u002F\u002A
PhpJava::main();