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@Antti
Antti / latency.txt
Created December 20, 2018 11:18 — forked from jboner/latency.txt
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
@bmhatfield
bmhatfield / .profile
Last active June 16, 2024 04:16
Automatic Git commit signing with GPG on OSX
# In order for gpg to find gpg-agent, gpg-agent must be running, and there must be an env
# variable pointing GPG to the gpg-agent socket. This little script, which must be sourced
# in your shell's init script (ie, .bash_profile, .zshrc, whatever), will either start
# gpg-agent or set up the GPG_AGENT_INFO variable if it's already running.
# Add the following to your shell init to set up gpg-agent automatically for every shell
if [ -f ~/.gnupg/.gpg-agent-info ] && [ -n "$(pgrep gpg-agent)" ]; then
source ~/.gnupg/.gpg-agent-info
export GPG_AGENT_INFO
else
@jpouellet
jpouellet / cve_2016_0728.c
Last active March 20, 2018 18:40 — forked from gcmurphy/cve_2016_0728.c
cve_2016_0728 exploit
/* $ gcc cve_2016_0728.c -o cve_2016_0728 -lkeyutils -Wall */
/* $ ./cve_2016_072 PP_KEY */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <keyutils.h>
#include <unistd.h>
#include <time.h>
@kmcallister
kmcallister / MOVED.md
Last active August 29, 2015 14:07
151-byte static binary for x86-64 Linux, all code in Rust
@willurd
willurd / web-servers.md
Last active June 13, 2024 14:37
Big list of http static server one-liners

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000
@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
@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 13:16 — forked from jboner/latency.txt
Latency numbers every programmer should know

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

@jboner
jboner / latency.txt
Last active June 16, 2024 08:12
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
@Antti
Antti / config.ru
Created March 6, 2012 12:32
Rails Lightweight Stack. Most of this is detailed on Crafting Rails Applications - http://pragprog.com/book/jvrails/crafting-rails-applications
# Run this file with `RAILS_ENV=production rackup -p 3000 -s thin`
# Be sure to have rails and thin installed.
require "rubygems"
# We are not loading Active Record, nor the Assets Pipeline, etc.
# This could also be in your Gemfile.
gem "actionpack", "~> 3.2"
gem "railties", "~> 3.2"
# The following lines should come as no surprise. Except by
@tomlea
tomlea / start_sql_servers.sh
Created March 3, 2011 13:51
Start a MySQL master/slave pair.
rm -R $HOME/Desktop/server-{1,2}
mkdir -p $HOME/Desktop/server-{1,2}
mysql_install_db --datadir=$HOME/Desktop/server-1 && mysqld --server-id 1 -h ~/Desktop/server-1 --socket ~/Desktop/server-1/mysql.sock -P 10001 --log-bin &
mysql_install_db --datadir=$HOME/Desktop/server-2 && mysqld --server-id 2 -h ~/Desktop/server-2 --socket ~/Desktop/server-2/mysql.sock -P 10002 --master-port=10001 --master-host=127.0.0.1 --master-user=root &
alias sql-master="mysql -h127.0.0.1 -P10001 -uroot"
alias sql-slave="mysql -h127.0.0.1 -P10002 -uroot"
alias sql-master-admin="mysqladmin -h127.0.0.1 -P10001 -uroot"