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@jboner
jboner / latency.txt
Last active May 21, 2024 18:29
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
@staltz
staltz / introrx.md
Last active May 20, 2024 14:59
The introduction to Reactive Programming you've been missing

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

@octocat
octocat / .gitignore
Created February 27, 2014 19:38
Some common .gitignore configurations
# Compiled source #
###################
*.com
*.class
*.dll
*.exe
*.o
*.so
# Packages #
@drmalex07
drmalex07 / README-setup-tunnel-as-systemd-service.md
Last active May 12, 2024 13:59
Setup a secure (SSH) tunnel as a systemd service. #systemd #ssh #ssh-tunnel #ssh-forward

README

Create a template service file at /etc/systemd/system/secure-tunnel@.service. The template parameter will correspond to the name of target host:

[Unit]
Description=Setup a secure tunnel to %I
After=network.target
@alexellis
alexellis / k8s-pi.md
Last active April 11, 2024 14:17
K8s on Raspbian
@Zulko
Zulko / 3D_piano_from_midi.py
Last active April 9, 2024 05:51
Turn a piano MIDI file into a basic 3D animated piano video.
"""
Turn a piano MIDI file into a basic 3D animated piano video.
See the result here:
I am leaving it as a script because it is not tested on enough MIDI files yet.
Zulko 2014
This script is released under a Public Domain (Creative Commons 0) licence.
@linuxmalaysia
linuxmalaysia / README-autossh-systemd.txt
Last active April 3, 2024 16:33
Autossh using systemd
1) ==== Autossh using systemd ====
Example from
https://gist.github.com/drmalex07/c0f9304deea566842490
2) =============
Install autossh
var active = false;
function changeRefer(details) {
if (!active) return;
for (var i = 0; i < details.requestHeaders.length; ++i) {
if (details.requestHeaders[i].name === 'Referer') {
details.requestHeaders[i].value = 'http://www.google.com/';
break;
}
@bvssvni
bvssvni / gist:9674632
Last active December 23, 2023 22:56
A Rust Chain Macro
//! Chain macro in Rust
//!
//! A typical usage is to avoid nested match expressions.
//!
//! Supports:
//! - Pattern matching
//! - Or expressions (A | B => ...)
//! - Guarded statements (x if <cond> => ...)
//! - Implicit else (requires all arms to return same type)