Kris Array Slicing

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Array Slicing fo’ Shizzle!: 

Array Slicing fo’ Shizzle! © Kris 2007

Some Background: 

Some Background 2001: Web servers (Tomcat, Resin, WebLogic, etc) 2002: Bull in a china shop

A Java Enigma: 

A Java Enigma Overt GC reliance has potential to make any language or system appear sluggish Java has few easy-to-apply alternatives Libraries & systems can appear GC-bound GC can be a synchronization bottleneck Yet, Java flourished on the server

GC Pressure Reduction: 

GC Pressure Reduction Low-level access to malloc/free Precision new & delete overrides Temporal struct or class on the stack Free-lists Array slicing

Array Slicing fo’ Shizzle!: 

Array Slicing fo’ Shizzle! Easy-to-use array aliasing Native to the language auto slice = array [start .. end];

Three Use-Cases: 

Three Use-Cases Text Processing Sliced HTTP Clustering with Tina

1: Integer as Text: 

1: Integer as Text char[] uitoa (uint val, char[] output=null) { if (output.length < unit.dig) output.length = uint.dig; auto len = output.length; do { output [--len] = val % 10; } while (val /= 10); return output [len .. $]; }

1: UTF Conversion: 

1: UTF Conversion dchar[] toUtf32 (char[] input, dchar[] output=null) { if (output.length < input.length) output.length = input.length; // convert input utf8 into output utf32 // … return output [0 .. len]; }

1: Parsing Lines of Text: 

1: Parsing Lines of Text // option 1 via an array foreach (line; splitLines (myText)) … The quick brown fox jumped over the lazy dog How now brown cow The rain in Spain falls mostly on the plain // option 2 via opApply foreach (line; lines (myText)) …

2: Sliced HTTP: 

2: Sliced HTTP Client

2: Sliced HTTP Server: 

2: Sliced HTTP Server Cookies Headers URI Request structured alias input buffer overlap optional

2: Thread Local Storage: 

2: Thread Local Storage

3: Clustering Model: 

3: Clustering Model Bulletin Task Queue Cache

3: Model Services: 

3: Model Services Bulletin Task Queue Cache put (msg) get () put (key, msg) get (key, remove) execute (msg) broadcast (msg)

3: Tina: 

3: Tina High performance Peer to peer design (no SPOF) Serialized D objects Near zero GC activity

3: Storage Request: 

3: Storage Request Client Object buffer

3: Task Request: 

3: Task Request

Tango Connection: 

Tango Connection Text processing supports slicing Conversion Tokenizing Streaming Utilities IO subsystem supports slicing Protocol readers (allocators) Buffering

Wrap-up: 

Wrap-up Overt GC reliance has potential to make any language or system appear sluggish Array slicing can be a powerful alternative D libraries & systems can easily be GC-lite Less multi-thread contention Show some GC love

Thank You: 

Thank You

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