In these presentation I talk about Parallel Programming, its necessities, challenges. Then I talk about how the syntax of languages like C# advances to improve the expressiveness of parallel programming.

1. Mehran Davoudi
Head of Development Department,
Carane Resource Planning Systems
http://ir.linkedin.com/in/mehrandvd/
Parallel Programming
Towards Efficient Cloud Computing

2. Presentation Overview
?
• Why to move
towards
parallel
programming?
• What’s the
most concerns
successful
applications to
implement
parallel?
• How to
handle
challenges
using new
coming
technologies

3. The Moore’s Law

The number of transistors on integrated
circuits doubles approximately every two
years.
2x every 2 year!

4. Cloud Hardware Infrastructure
Are they really
used?
Or just one part
is doing the
job!?

5. Why is it so hard?
Debugging
Error
Management
Cancellation
Continuation
Shared
Memory

6. Shared Memory
The most famous problem in parallel computing
Makes everything very complicated
Heard about them at the university
Very important but not the topic of this
presentation

7. Debugging
Single
Current
Statement
Multiple
Current
Statements

8. Error Management
100 threads are working
In the middle, 3 of them fail
What to do now!?
Continue?
Throw
Exception?
What about
remained
threads?

9. Cancellation
100 threads are working
30 done, 20 doing, 50 waiting
User cancels! What to do now!?
Finish
doings?
Cut the
doings?
Don’t allow
to cancel!?

10. How the technology helps to manage
Async/Await
Immutable
collections
Lambdas
Tasks
Aggregated
Exceptions
Threads
Isolated
Types

11. Task instead of Thread
A better abstraction
• Task hides most of unnecessary complicated
details of threads
Managed by .NET
• Thread pooling, resource management and many
others are controlled by the framework
A well shaped API
• It has a Fluent API
• Well integrated with Lambdas

12. TPL, PLINQ
TPL (Task Parallel
Library)
Cancellation
Continuation
Error
Management
Cancellation
Token
Next line is
not the next!
Aggregate
Exception
PLINQ
High level
parallelizing
tools
Based on the
famous LINQ
Parallel.For()
Enumerable
.AsParallel()

13. Async/Await: A real magic!
TPL
Native
Threads

14. Debugging Tools
Parallel
Stack
Parallel
Watch

15. A totally different thinking style
A totally different terminology for
developers
Next statement ≠ Next Line
It takes about 6 months to teach and
prepare a professional development team

16. Resources

Andres Heijlsberg conference on BUILD

Patterns of Parallel Programming, Stephen Toub, 2010

Erik Meyer and Joe Duffy talk on Chanel 9

Eric Lippert weblog on Parallel Programming

Joseph Albahari weblog on Parallel Programming

Wikipedia page of Moore’s Law

17. Thanks
QUESTIONS!?

Also you can contact me at:
 Mail:
Mehran.Davoudi@Hotmail.com
 LinkedIn:
http://ir.linkedin.com/in/mehrandvd
 Facebook:
www.facebook.com/mehrandvd