Parallel For Loops with the Parallel Programming Library

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Parallel For Loops with the PPL Jim McKeeth Lead World Wide Developer Evangelist / Engineer [email protected] @JimMcKeeth

Tuesday, the 3rd February, 2015 Download a free trial – NOW! hOp://embt.co/trialdownloads

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How Skill Sprints Work. -‐ Agenda

•  READY –  Tips tricks & short URLS

•  SET –  20 minutes, 1 topic

•  GO –  Demo and discussion –  Live Q&A

Download a free trial – NOW! hOp://embt.co/trialdownloads


This Skill Sprint Works with . . .

•  Windows •  Mac OS X •  Android •  iOS •  RAD Studio •  Appmethod •  Object Pascal •  C++

•  RAD Studio XE7 DocWiki –  hOp://embt.co/latestdocwiki

hOp://docwiki.embarcadero.com/RADStudio/en/

•  Appmethod September 2014 DocWiki –  hOp://embt.co/AppmethodTopics

hOp://docwiki.appmethod.com/appmethod/topics/en/ •  Appmethod supports the FireMonkey

framework on all 4 pla]orms while RAD Studio, Delphi and C++Builder also support VCL on Windows. Contact sales with any quesaons!


Parallel For Loops with the PPL

•  Quickly and easily supercharge your code with Parallel For Loops

•  Part of the new Parallel Programming Library •  Works with C++ and Object Pascal on all pla]orms •  Take advantage of processor architectures like hyper-‐threading and mulaple cores present in most mobile devices, desktops and laptops



•  Uses System.Threading unit •  Like a normal For loop, but spread across thread pool •  Each iteraaon is a TTask in the thread pool •  Order of iteraaons is undetermined •  Pool opamizes for CPU architecture •  Stride allows for control of iteraaon grouping


Parallel For Loop Syntax

TParallel.For(Stride, Min, Max, procedure (Idx: Integer) begin if IsPrime(Idx) then begin TInterlocked.Increment (Tot); TThread.Queue(TThread.CurrentThread, procedure begin Memo1.Lines.Add(Idx.ToString); end); end; end);

You can use Queue and Synchronize from a Parallel For, but it reduces the performance.


Parallel For Loop Syntax // . . . TParallel::For(NULL, Min, Max, MyIteratorEvent); // . . . void __fastcall TFormThreading::MyIteratorEvent(TObject *Sender, int AIndex) {

if(IsPrime(AIndex)){ TInterlocked::Increment(Tot); };

}


DEMONSTRATION Parallel For Loops with the Parallel Programming Library



•  Uses System.Threading unit •  Quickly and easily supercharge your code with Parallel For Loops

•  Each iteraaon must be independent of order •  Reduce runame on mulaprocessor systems


Parallel For Resources

•  Samples –  C:\Users\Public\Documents\Embarcadero\Studio\15.0\Samples\Object Pascal\RTL\Parallel Library –  C:\Users\Public\Documents\Embarcadero\Studio\15.0\Samples\CPP\RTL\Parallel Library

•  DocWiki Tutorials –  hOp://docwiki.embarcadero.com/RADStudio/XE7/en/

Using_TParallel.For_from_the_Parallel_Programming_Library

•  Blog Posts –  CodeRage 9 Video hOp://dannywind.nl/delphi/coderage9/ –  Stephen Ball’s series hOp://delphiaball.co.uk/tag/parallel-‐programming/ –  Malcolm Groves’ series hOp://www.malcolmgroves.com/blog/?cat=109 –  Examples, links and more: hIp://delphi.org/?p=1886 (Including the C++ Lambda links)

Special offers: hOp://embarcadero.com/radoffer/


Next Time….

•  FireDAC: Cached Updates and Auto-‐inc Fields •  Defer posang updates to a database •  Post mulaple updates in a single batch •  Thursday the 5th of February

–  6AM San Francisco / 9AM New York / 2PM London / 3PM Milan –  11AM San Francisco / 2PM New York / 7PM London / 8PM Milan –  5PM San Francisco / Fri 9AM Tokyo / Fri 10AM Sydney

Sign-‐up: hOp://www.embarcadero.com/landing-‐pages/skill-‐sprints


Next Time….

•  Deep Dive into Futures and the PPL •  Create more responsive apps •  Futures calculate values asynchronously •  Tuesday the 10th of February

–  6AM San Francisco / 9AM New York / 2PM London / 3PM Milan –  11AM San Francisco / 2PM New York / 7PM London / 8PM Milan –  5PM San Francisco / Wed 9AM Tokyo / Wed 10AM Sydney



RAD Studio XE7 Special Offers

More details hOp://www.embarcadero.com/radoffer

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When you purchase the

upgrade with 1 year Support and Maintenance!

Build a Mobile Pla]orm for the Enterprise

With Enterprise ediCon or higher.

Powerful Tools to Boost Your Coding (Worth Over $700)

•  New Object Pascal Handbook by Marco Cantu

•  Castalia for Delphi 2014.11 •  VCL and FireMonkey Premium Styles

•  Mida Converter Basic

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Parallel For Loops with the Parallel Programming Library