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Frank Lan tlan16

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@jboner
jboner / latency.txt
Last active June 30, 2024 18:51
Latency Numbers Every Programmer Should Know
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
@dergachev
dergachev / squid-deb-proxy_on_docker.md
Last active May 25, 2023 03:55
Caching debian package installation with docker

TLDR: I now add the following snippet to all my Dockerfiles:

# If host is running squid-deb-proxy on port 8000, populate /etc/apt/apt.conf.d/30proxy
# By default, squid-deb-proxy 403s unknown sources, so apt shouldn't proxy ppa.launchpad.net
RUN route -n | awk '/^0.0.0.0/ {print $2}' > /tmp/host_ip.txt
RUN echo "HEAD /" | nc `cat /tmp/host_ip.txt` 8000 | grep squid-deb-proxy \
  && (echo "Acquire::http::Proxy \"http://$(cat /tmp/host_ip.txt):8000\";" > /etc/apt/apt.conf.d/30proxy) \
  && (echo "Acquire::http::Proxy::ppa.launchpad.net DIRECT;" >> /etc/apt/apt.conf.d/30proxy) \
  || echo "No squid-deb-proxy detected on docker host"
@tsiege
tsiege / The Technical Interview Cheat Sheet.md
Last active June 28, 2024 10:38
This is my technical interview cheat sheet. Feel free to fork it or do whatever you want with it. PLEASE let me know if there are any errors or if anything crucial is missing. I will add more links soon.

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






\

@soheilhy
soheilhy / nginxproxy.md
Last active May 16, 2024 08:59
How to proxy web apps using nginx?

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

@darrenscerri
darrenscerri / Middleware.js
Last active July 11, 2023 02:59
A very minimal Javascript (ES5 & ES6) Middleware Pattern Implementation
var Middleware = function() {};
Middleware.prototype.use = function(fn) {
var self = this;
this.go = (function(stack) {
return function(next) {
stack.call(self, function() {
fn.call(self, next.bind(self));
});
@jesperronn
jesperronn / docx2md.md
Last active November 21, 2023 12:49 — forked from aembleton/docx2md.md
Convert a Word Document into MD

Converting a Word Document to Markdown in One Move

The Problem

A lot of important government documents are created and saved in Microsoft Word (*.docx). But Microsoft Word is a proprietary format, and it's not really useful for presenting documents on the web. So, I wanted to find a way to convert a .docx file into markdown.

Installing Pandoc

On a mac you can use homebrew by running the command brew install pandoc.

The Solution

@vbsessa
vbsessa / chrome-devtools.md
Last active June 24, 2024 20:50
How to customize Chrome devtools fonts

  1. Enable #enable-devtools-experiments flag in chrome://flags section.

  2. Open Chorme Devtools and check Settings > Experiments > Allow extensions to load custom stylesheets.

  3. Create the following four files in a dedicated folder.

    3.1. devtools.html

    <html>
<head></head>
<body><script src="devtools.js"></script></body>
@eguven
eguven / brew-list.sh
Last active June 30, 2024 14:40
List all packages installed using Homebrew and their sizes
# this original one uses values returned from 'brew info'
brew list --formula | xargs -n1 -P8 -I {} \
sh -c "brew info {} | egrep '[0-9]* files, ' | sed 's/^.*[0-9]* files, \(.*\)).*$/{} \1/'" | \
sort -h -r -k2 - | column -t
# faster alternative using 'du'
du -sch $(brew --cellar)/*/* | sed "s|$(brew --cellar)/\([^/]*\)/.*|\1|" | sort -k1h
@Brainiarc7
Brainiarc7 / nvenc-capabilities-ffmpeg.md
Last active October 10, 2023 23:26
See the supported NVENC and NPP capabilities in your FFmpeg build

Quickly check for supported NVENC and NPP hardware acceleration capabilities in FFmpeg on your platform:

Depending on how you built ffmpeg, you may want to check the supported NVENC-based hardware acceleration capabilities in ffmpeg by running:

$ for i in encoders decoders filters; do
    echo $i:; ffmpeg -hide_banner -${i} | egrep -i "npp|cuvid|nvenc|cuda|nvdec"
done

Sample output (as on my testbed):

@gcanti
gcanti / fp-ts-technical-overview.md
Last active March 11, 2024 02:40
fp-ts technical overview

Technical overview

A basic Option type

// Option.ts

// definition
export class None {
  readonly tag: 'None' = 'None'