Dima Vlasov DmitriyVlasov

## latency.markdown

      
              2 files
            
          
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              27 stars
            
          
                valadan
                / latency.markdown
            
            
              Created
              September 14, 2012 11:41
                — forked from hellerbarde/latency.markdown
            
              
                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

  
## GIF-Screencast-OSX.md

      
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              5314 stars
            
          
                dergachev
                / GIF-Screencast-OSX.md
            
            
              Last active
              May 2, 2024 05:55
            
              
                OS X Screencast to animated GIF
              
          
    OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

  
## programming_basics.rst

      
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                gabriel-fallen
                / programming_basics.rst
            
            
              Last active
              October 31, 2022 10:11
            
              
                Моё представление о необходимом минимуме знаний чтобы что-то программировать более-менее осмысленно.
              
          
    Вступление

Во-первых, это моё мнение, и я его никому не навязываю. Во-вторых, список не обязательно исчерпывающий. В-третьих, он ориентирован на определённую "философию", которая тоже не является исчерпывающей или абсолютно правильной. Поэтому, если Вам эти рекомендации не подходят -- не следуйте им.
Философия такова. Для того чтобы осмысленно программировать на начальном этапе не нужно знать Computer Science, теорию алгоритмов и сложности вычислений или детально разбираться в устройстве и работе компьютера. Достаточно хорошо делать две вещи:

алгоритмизировать решение задачи (разбивать его на простые последовательные шаги: сначала это, а потом вот это),
знать, понимать смысл и назначение, использовать и подгонять друг к другу стандартные элементы решений (условия, циклы, структуры данных, алгоритмы и прочие "паттерны")


## type-dependency-graph.fsx
(*
This script analyzes the dependencies between top level types in a .NET Assembly.
It is then used to compare the dependency relationships in some F# projects with those in some C# projects.

Note that no attempt has been made to optimize the code yet!

REQUIRES:

* Mono.Cecil for code analysis
  From http://www.mono-project.com/Cecil#Download

## Excel4.fs
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

namespace Utility

## higher_order_functions.org

      
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                hhutch
                / higher_order_functions.org
            
            
              Last active
              May 20, 2020 20:02
            
          
  F# C# Scala Clojure Python Ruby Haskell SQL OCaml Common Lisp Erlang Smalltalk Scheme Ecmascript 5 Perl 5
  map Select map map map collect map Select map mapcar map collect: map map map
  filter Where filter filter filter select filter Where filter remove-if-not filter select: filter filter grep
  fold Aggregate foldLeft reduce reduce inject foldl


## DeedleFormatter.fsx
#I "../lib"
#r "FSharp.Markdown.dll"
#r "FSharp.Literate.dll"
#r "Deedle.dll"

open System.IO
open Deedle
open Deedle.Internal
open FSharp.Literate
open FSharp.Markdown

## gist:08d36d1e79603ef12c25
//------------------------------------------
// Step 0. Boilerplate to get the paket.exe tool

open System
open System.IO

Environment.CurrentDirectory <- __SOURCE_DIRECTORY__

if not (File.Exists "paket.exe") then
    let url = "http://fsprojects.github.io/Paket/stable"

## Eto sample script


#r @"packages\Eto.Forms.1.3.0\lib\net40\Eto.dll"
#r @"packages\Eto.Platform.Windows.1.3.0\lib\net40\Eto.Platform.Windows.dll"

open System
open Eto.Forms
open Eto.Drawing


## nuget-dependency-visualizer.fsx
#r @"packages\Streams.0.2.5\lib\Streams.Core.dll"

open System
open System.IO
open System.Collections.Generic
open Nessos.Streams

// make Visual Studio use the script directory
Directory.SetCurrentDirectory(__SOURCE_DIRECTORY__)
	(*
	This script analyzes the dependencies between top level types in a .NET Assembly.
	It is then used to compare the dependency relationships in some F# projects with those in some C# projects.

	Note that no attempt has been made to optimize the code yet!

	REQUIRES:

	* Mono.Cecil for code analysis
	From http://www.mono-project.com/Cecil#Download
	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	// THE SOFTWARE.

	namespace Utility
F#	C#	Scala	Clojure	Python	Ruby	Haskell	SQL	OCaml	Common Lisp	Erlang	Smalltalk	Scheme	Ecmascript 5	Perl 5
map	Select	map	map	map	collect	map	Select	map	mapcar	map	collect:	map	map	map
filter	Where	filter	filter	filter	select	filter	Where	filter	remove-if-not	filter	select:	filter	filter	grep
fold	Aggregate	foldLeft	reduce	reduce	inject	foldl
	#I "../lib"
	#r "FSharp.Markdown.dll"
	#r "FSharp.Literate.dll"
	#r "Deedle.dll"

	open System.IO
	open Deedle
	open Deedle.Internal
	open FSharp.Literate
	open FSharp.Markdown
	//------------------------------------------
	// Step 0. Boilerplate to get the paket.exe tool

	open System
	open System.IO

	Environment.CurrentDirectory <- __SOURCE_DIRECTORY__

	if not (File.Exists "paket.exe") then
	let url = "http://fsprojects.github.io/Paket/stable"


	#r @"packages\Eto.Forms.1.3.0\lib\net40\Eto.dll"
	#r @"packages\Eto.Platform.Windows.1.3.0\lib\net40\Eto.Platform.Windows.dll"

	open System
	open Eto.Forms
	open Eto.Drawing
	#r @"packages\Streams.0.2.5\lib\Streams.Core.dll"

	open System
	open System.IO
	open System.Collections.Generic
	open Nessos.Streams

	// make Visual Studio use the script directory
	Directory.SetCurrentDirectory(__SOURCE_DIRECTORY__)