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@jboner
jboner / latency.txt
Last active November 19, 2024 14:58
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
@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

@willurd
willurd / web-servers.md
Last active November 13, 2024 13:44
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
@velicast
velicast / stdc++.h
Created July 17, 2013 17:56
Linux GCC 4.8.0 /bits/stdc++.h header definition.
// C++ includes used for precompiling -*- C++ -*-
// Copyright (C) 2003-2013 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
@DanHerbert
DanHerbert / fix-homebrew-npm.md
Last active September 15, 2024 20:33
Instructions on how to fix npm if you've installed Node through Homebrew on Mac OS X or Linuxbrew

OBSOLETE

This entire guide is based on an old version of Homebrew/Node and no longer applies. It was only ever intended to fix a specific error message which has since been fixed. I've kept it here for historical purposes, but it should no longer be used. Homebrew maintainers have fixed things and the options mentioned don't exist and won't work.

I still believe it is better to manually install npm separately since having a generic package manager maintain another package manager is a bad idea, but the instructions below don't explain how to do that.

Fixing npm On Mac OS X for Homebrew Users

Installing node through Homebrew can cause problems with npm for globally installed packages. To fix it quickly, use the solution below. An explanation is also included at the end of this document.

@daniellevass
daniellevass / android_material_design_colours.xml
Last active September 9, 2024 06:08
Android Material Design Colours
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- google's material design colours from
http://www.google.com/design/spec/style/color.html#color-ui-color-palette -->
<!--reds-->
<color name="md_red_50">#FFEBEE</color>
<color name="md_red_100">#FFCDD2</color>
<color name="md_red_200">#EF9A9A</color>
@nojvek
nojvek / Tinder Auto-liker
Last active November 12, 2021 18:28
Tinder Auto-liker script
<?php
// Licence: WTFPL ! http://www.wtfpl.net/about/
$fbAuth = array("facebook_id" => "123456789", "facebook_token" => "<Use charles proxy to do man-in-middle SSL sniffing and extract fb token>");
// Do the magic.
$tinderToken = tinderCall("auth", "token", $fbAuth); // Authenticate
$authToken = "X-Auth-Token: $tinderToken\r\nAuthorization: Token token=\"$tinderToken\"\r\n";
@shadowfax92
shadowfax92 / flipkart_parser.py
Last active September 2, 2023 09:43
Flipkart Billion dollar sale hack
# Author = Nikhil Venkat Sonti
# email = [email protected]
# github ID = shadowfax92
import sys
from xml.dom.minidom import _get_StringIO
from lxml import html
import requests
import os
import re
import time
@eyecatchup
eyecatchup / hammerhead-from-lrx21o-to-lrx22c.md
Last active November 1, 2023 08:35
A step-by-step guide how to manually flash the Android 5.0.1 (LRX22C) OTA-Update on a Nexus 5 with modified system (custom recovery/kernel, rooted, modified framework etc.)..

Update: For those interested, here's the version for updating from Android 5.1.0 (LMY47D/LMY47I) to Android 5.1.1 (LMY48B):
https://gist.github.com/eyecatchup/dab5cf7977008e504213


  UPDATE `NEXUS 5` 
     SET `VERSION`='5.0.1', `BUILD`='LRX22C', `RECOVERY`='CUSTOM', `ROOTED`=1 
   WHERE `VERSION`='5.0' && `BUILD`='LRX21O' && `RECOVERY`='CUSTOM' && `ROOTED`=1 
         && `WANNA_KEEP_USERDATA`=1;
- This page is a collection of some of the Advanced queries from the [[Datalog]] channel on the [[Logseq/Discord]] server. #datalog
id:: 61db13f4-75e8-4f87-ad60-3ac3479c5fc8
- ### Resources
- [link: The first message on the datalog channel](https://discord.com/channels/725182569297215569/743139225746145311/743139795865174119)
- [link: Logseq docs - Advanced queries](https://docs.logseq.com/#/page/advanced%20queries)
- [link: Logseq datascript schema](https://gist.github.com/tiensonqin/9a40575827f8f63eec54432443ecb929)
- [link: Logseq frontend db model](https://github.com/logseq/logseq/blob/master/src/main/frontend/db/model.cljs)
- [link: How to Graph Your Data - talk by Paula Gearon](https://youtu.be/tbVwmFBnfo4)
- [link: Domain modelling with datalog - talk by Norbert Wojtowicz](https://youtu.be/oo-7mN9WXTw)
- [link: Athens Research ClojureFam](https://github.com/athensresearch/ClojureFam)