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@jboner
jboner / latency.txt
Last active May 15, 2025 07:53
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
@domenic
domenic / classes.js
Created June 6, 2012 22:18
DDDNYC talk notes
"use strict";
// Essentials of prototypes:
var carProto = {
drive: function () {
console.log("driving a " + this.color + " car");
}
};
@statico
statico / gist:3172711
Created July 24, 2012 21:15
How to use a PS3 controller on Mac OS X 10.7 (Lion)

How to use a PS3 controller on Mac OS X 10.7 (Lion)

  1. Open Apple menu -> System Preferences -> Bluetooth and disable Bluetooth on Mac as well as any other nearby Macs or devices which will try to pair with and confuse the controller.

  2. Reset PS3 controller by inserting paperclip into pinhole near L2 button.

  3. Connect PS3 controller to Mac with USB cable.

  4. Enable Bluetooth.

@c4milo
c4milo / test-iab.html
Created August 8, 2012 01:35
<!DOCTYPE HTML>
<html lang="en-us">
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Widgets Magazine</title>
<style type="text/css" media="screen">
</style>
<script type='text/javascript'>
(function() {
var useSSL = 'https:' == document.location.protocol;
@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active May 14, 2025 00:29
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%'
@kuenishi
kuenishi / gist:3825178
Created October 3, 2012 05:22
Accessing to VM via serial console at VMware Fusion 5

Environment

  • Using FreeBSD
  • Mountain Lion
  • VMware Fusion 5
  • Your VMware is installed at '/Applications/VMware Fusion.app'
  • Command Line tools are at '/Applications/VMware Fusion.app/Contents/Library'
  • especially vmrun
@dropwhile
dropwhile / .netrc
Last active February 22, 2024 16:22
example netrc
# .netrc
## generate token with https://help.github.com/articles/creating-an-oauth-token-for-command-line-use
machine github.com login <token>
@jamiehodge
jamiehodge / slides.md
Created December 3, 2012 09:40
Hypermedia APIs

!SLIDE

Hypermedia APIs

"Follow your nose"

— Roy T. Fielding

!SLIDE

"build scalable, flexible implementations that do not simply run on the Web, but that actually exist in the Web"

@davidmatas
davidmatas / mou.html
Last active March 1, 2023 16:42
highlight syntax for Mou.app
<!-- Highlight syntax for Mou.app, insert at the bottom of the markdown document -->
<script src="http://yandex.st/highlightjs/7.3/highlight.min.js"></script>
<link rel="stylesheet" href="http://yandex.st/highlightjs/7.3/styles/github.min.css">
<script>
hljs.initHighlightingOnLoad();
</script>
anonymous
anonymous / mark-sweep-gc.js
Created December 27, 2012 20:01
The simplest algorithm of Mark and Sweep garbage collection technique.
/**
* Mark and Sweep Garbage Collection technique.
* MIT Style License
* by Dmitry Soshnikov
*/
// This diff describes the simplest version of mark and sweep
// GC in order to understand the basic idea. In real practice the
// implementation can be much tricker and more optimized.