Shallow Dive PFX

Shallow Dive: Parallel Fx Alex Moore Software Developer, TDCI

No More Free Lunch Processors not getting much faster

No More Free Lunch transistors++

No More Free Lunch transistors++ speed++

No More Free Lunch transistors++ speed++ cores++

Elephant in the Room

Elephant in the Room Parallel / Concurrent Programming is about to reach it’s boiling point

Elephant in the Room Can’t ignore it much longer

Elephant in the Room There will be language, library, and tool support for this soon. There will be language, library, tool, and hardware support for this soon. Concurrency is one of the main themes for C# 4.0, the PFX will probably be part of .Net 4.0, Visual Studio 2010 will have tools to help better debug concurrent programs, and Intel’s next Core processor, the i7, will have a whole slew of improvements to help run concurrent and threaded applications better.

Parallel Extensions to the .Net Framework PLINQ C D Task Parallel Library S Scheduler System.Threading

How to Express Parallelism

How to Express Parallelism Threading sucks

How to Express Parallelism Declarative data parallelism - PLINQ

How to Express Parallelism Declarative data parallelism - PLINQ Imperative data parallelism - Parallel.For

How to Express Parallelism Declarative data parallelism - PLINQ Imperative data parallelism - Parallel.For Imperative task parallelism - Tasks, Futures

PLINQ from x in set where x == somevalue select expensiveFunction(x);

PLINQ from x in set where x == somevalue select expensiveFunction(x); from x in set.AsParallel() where x == somevalue select expensiveFunction(x);

Parallel.For for( int i = 0; i < 10; i++ ) { ... }

Parallel.For for( int i = 0; i < 10; i++ ) { ... } Parallel.For( 0, 10, i => { ... } );

Parallel.ForEach foreach( var x in set ) { ... }

Parallel.ForEach foreach( var x in set ) { ... } Parallel.ForEach( set, x => {...});

Tasks A(); B(); C(); Do_Something();

Tasks Task t1 = Task.Create( ()=> A(); ); Task t2 = Task.Create( ()=> B(); ); Task t3 = Task.Create( ()=> C(); ); Task.WaitAll(t1, t2, t3); Do_Something();

Futures var a = A(); var b = B(); var c = C(); Do_Something(a,b,c);

Futures var a = Future.Create( ()=> A(); ); var b = Future.Create( ()=> B(); ); var c = Future.Create( ()=> C(); ); Do_Something(a,b,c);

Box of Sharp Knives PFX is a big box of sharp knives. Yes they are shiny and you want to grab them but be careful.

Box of Sharp Knives ★ Not a silver bullet for performance This should not be your ﬁrst choice for improving performance. Clean “responsible” design will go a long way when optimizing code, and will help when deciding where to apply concurrency.

Box of Sharp Knives ★ Not a silver bullet for performance ✓ Get the CTP ✓ Read, Do, and Learn This should not be your ﬁrst choice for improving performance. Clean “responsible” design will go a long way when optimizing code, and will help when deciding where to apply concurrency.

Questions? Comments ? Are there any questions ? Comments ?

How to ﬁnd info • MSDN Magazine - October ‘08 • Channel 9 - “Parallel Extensions” • Blogs: Joe Duffy, Herb Sutter • http://geekswithblogs.net/alexmoore/ archive/2008/10/22/parallel-extensions- links.aspx

Thanks! Alex Moore Blog: geekswithblogs.net/alexmoore Twitter: @alexmoore

Shallow Dive PFX

by Alex Moore on Oct 26, 2008

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