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@jboner
jboner / latency.txt
Last active May 1, 2024 14:21
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
@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active May 1, 2024 13:31
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
@JamesMGreene
JamesMGreene / gitflow-breakdown.md
Last active April 30, 2024 14:11
`git flow` vs. `git`: A comparison of using `git flow` commands versus raw `git` commands.

Initialize

gitflow git
git flow init git init
  git commit --allow-empty -m "Initial commit"
  git checkout -b develop master

Connect to the remote repository

@nicktoumpelis
nicktoumpelis / repo-rinse.sh
Created April 23, 2014 13:00
Cleans and resets a git repo and its submodules
git clean -xfd
git submodule foreach --recursive git clean -xfd
git reset --hard
git submodule foreach --recursive git reset --hard
git submodule update --init --recursive
@FreddieOliveira
FreddieOliveira / docker.md
Last active April 30, 2024 10:31
This tutorial shows how to run docker natively on Android, without VMs and chroot.

Docker on Android 🐋📱

Edit 🎉

All packages, except for Tini have been added to termux-root. To install them, simply pkg install root-repo && pkg install docker. This will install the whole docker suite, left only Tini to be compiled manually.


Summary

@yogthos
yogthos / clojure-beginner.md
Last active April 29, 2024 10:56
Clojure beginner resources

Introductory resources

@1wErt3r
1wErt3r / SMBDIS.ASM
Created November 9, 2012 22:27
A Comprehensive Super Mario Bros. Disassembly
;SMBDIS.ASM - A COMPREHENSIVE SUPER MARIO BROS. DISASSEMBLY
;by doppelganger (doppelheathen@gmail.com)
;This file is provided for your own use as-is. It will require the character rom data
;and an iNES file header to get it to work.
;There are so many people I have to thank for this, that taking all the credit for
;myself would be an unforgivable act of arrogance. Without their help this would
;probably not be possible. So I thank all the peeps in the nesdev scene whose insight into
;the 6502 and the NES helped me learn how it works (you guys know who you are, there's no
@CristinaSolana
CristinaSolana / gist:1885435
Created February 22, 2012 14:56
Keeping a fork up to date

1. Clone your fork:

git clone git@github.com:YOUR-USERNAME/YOUR-FORKED-REPO.git

2. Add remote from original repository in your forked repository:

cd into/cloned/fork-repo
git remote add upstream git://github.com/ORIGINAL-DEV-USERNAME/REPO-YOU-FORKED-FROM.git
git fetch upstream
@dianjuar
dianjuar / i3-shortcuts-screenshot.md
Last active April 24, 2024 15:10
My i3 shortcuts to take screenshots

Requirements

  • maim
  • xclip

Set-up

Set this on your i3 config file ~/.i3/config

# Screenshots