desdeux

## latency.markdown

      
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                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

  
## vim_cheatsheet.md

      
              1 file
            
          
              290 forks
            
          
              20 comments
            
          
              929 stars
            
          
                awidegreen
                / vim_cheatsheet.md
            
            
              Last active
              June 17, 2024 03:41
            
              
                Vim shortcuts
              
          
    Introduction


C-a == Ctrl-a
M-a == Alt-a

General

:q        close
:w        write/saves
:wa[!]    write/save all windows [force]
:wq       write/save and close


## web-servers.md

      
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                willurd
                / web-servers.md
            
            
              Last active
              June 26, 2024 11:15
            
              
                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

  
## preprocessor_fun.h
// Just before switching jobs:
// Add one of these.
// Preferably into the same commit where you do a large merge.
//
// This started as a tweet with a joke of "C++ pro-tip: #define private public",
// and then it quickly escalated into more and more evil suggestions.
// I've tried to capture interesting suggestions here.
//
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,

## x86-assembly-notes.md

      
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              5 comments
            
          
              129 stars
            
          
                mikesmullin
                / x86-assembly-notes.md
            
            
              Last active
              June 19, 2024 16:42
            
              
                Notes on x86-64 Assembly and Machine Code
              
          
    Mike's x86-64 Assembly (ASM) Notes

Assembling Binary Machine Code

Operating Modes:

These determine the assumed/default size of instruction operands,
and restricts which opcodes are available, and how they are used.
Modern operating systems, booted inside Real mode,

  
## wave_play_wasapi_shared.cpp
/*
 * wave_play_wasapi_shared.cpp
 *
 * Created by fukuroda (https://github.com/fukuroder)
 */

 // windows API
#include <windows.h>
#include <audioclient.h>
#include <mmdeviceapi.h>

## postgres-cheatsheet.md

      
              1 file
            
          
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              3510 stars
            
          
                Kartones
                / postgres-cheatsheet.md
            
            
              Last active
              June 26, 2024 18:01
            
              
                PostgreSQL command line cheatsheet
              
          
    PSQL

Magic words:
psql -U postgres
Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)


## 0001-mmc-sdhci-Disable-run-time-PM.patch
From df5bb0eca11e6ab072908b6e0d2e7d9e01d1eb84 Mon Sep 17 00:00:00 2001
From: Dong Aisheng <b29396@freescale.com>
Date: Wed, 24 Jun 2015 21:28:48 +0200
Subject: [PATCH] mmc: sdhci: get runtime pm when sdio irq is enabled

SDIO cards may need clock to send the card interrupt to host.
Thus, we get runtime pm when sdio irq is enabled to prevent the clock
resource is released and put it when sdio irq is disabled.

Signed-off-by: Dong Aisheng <b29396@freescale.com>

## minimal_vst2x_host.cpp
// Win32 : Minimal VST 2.x Synth host in C++11.
//
// This is a simplified version of the following project by hotwatermorning :
//      A sample VST Host Application for C++ Advent Calendar 2013 5th day.
//      https://github.com/hotwatermorning/VstHostDemo
//
// Usage :
//      1. Compile & Run this program.
//      2. Select your VST Synth DLL.
//      3. Press QWERTY, ZXCV, etc.

## sdl2_stbtt.c
#include "SDL.h"

/*
   Compilation:
   ============
   gcc -g --std=c99 -o sdl2_stbtt sdl2_stbtt.c `sdl2-config --cflags --libs` -lm

   Usage:
   ======
   ./sdl2_stbtt /usr/share/fonts/TTF/LiberationMono-Regular.ttf
	// Just before switching jobs:
	// Add one of these.
	// Preferably into the same commit where you do a large merge.
	//
	// This started as a tweet with a joke of "C++ pro-tip: #define private public",
	// and then it quickly escalated into more and more evil suggestions.
	// I've tried to capture interesting suggestions here.
	//
	// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
	// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,
	/*
	* wave_play_wasapi_shared.cpp
	*
	* Created by fukuroda (https://github.com/fukuroder)
	*/

	// windows API
	#include <windows.h>
	#include <audioclient.h>
	#include <mmdeviceapi.h>
	From df5bb0eca11e6ab072908b6e0d2e7d9e01d1eb84 Mon Sep 17 00:00:00 2001
	From: Dong Aisheng <b29396@freescale.com>
	Date: Wed, 24 Jun 2015 21:28:48 +0200
	Subject: [PATCH] mmc: sdhci: get runtime pm when sdio irq is enabled

	SDIO cards may need clock to send the card interrupt to host.
	Thus, we get runtime pm when sdio irq is enabled to prevent the clock
	resource is released and put it when sdio irq is disabled.

	Signed-off-by: Dong Aisheng <b29396@freescale.com>
	// Win32 : Minimal VST 2.x Synth host in C++11.
	//
	// This is a simplified version of the following project by hotwatermorning :
	// A sample VST Host Application for C++ Advent Calendar 2013 5th day.
	// https://github.com/hotwatermorning/VstHostDemo
	//
	// Usage :
	// 1. Compile & Run this program.
	// 2. Select your VST Synth DLL.
	// 3. Press QWERTY, ZXCV, etc.
	#include "SDL.h"

	/*
	Compilation:
	============
	gcc -g --std=c99 -o sdl2_stbtt sdl2_stbtt.c `sdl2-config --cflags --libs` -lm

	Usage:
	======
	./sdl2_stbtt /usr/share/fonts/TTF/LiberationMono-Regular.ttf