Comment Feed for Inside Parallel Extensions for .NET 2008 CTP Part 1 (Going Deep on Channel 9)

Re: Re: Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

William Stacey — Sun, 08 Jun 2008 20:41:23 GMT

I agree the ccr is a bit different. However, it is the pattern that is important and what makes that model powerful.
However, reducing apis is also good when possible. In that vain, I am thinking you could add a Port class in the TPL and use Linq to query the Port(s) and the linq query will replace current Selector model. Then (I think) we could get best of both worlds and maintain similar programming model. Wonder what Joe thinks on this idea.

Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Christian Liensberger — Sun, 08 Jun 2008 13:03:35 GMT

One question: Isn't calling the Task.Create method to create the task and then calling .ContinueWith on the task (to specify a delegate that is called when having finished the work) creating a racing condition? Or is it just that the delegate in continue with is just invoked when the task is finished. Means if the task is finished and another continue with is registered it is immediately invoked?

Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Christian Liensberger — Sun, 08 Jun 2008 12:38:06 GMT

Awesome interview. Thanks for sharing!

Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

hillr — Sat, 07 Jun 2008 05:56:02 GMT

Did you guys enable DRM on the high def WMV? While I was viewing the HD WMV on Vista x86 SP1, mfpmp.exe (Media Foundation Protected Pipeline exe) consistently sucked down about 15% of my (single-core) CPU cycles. :-(

Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Allan Lindqvist — Fri, 06 Jun 2008 21:14:45 GMT

got another question.. might be a bit noobish but i can live with that :)
how the heck do you control sync without locks? (the statement or mutexes) that just seems impossible to me :) (its obviously not, but i just cant see it) how do you do that in straight up managed code? i'd love to see a deep dive into that.. :)

Re: Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Allan Lindqvist — Fri, 06 Jun 2008 21:05:02 GMT

oh, alright, thanks for the reply :) i will definitly try out this tpl ctp:)
for me personally, it seemed that the ccr was cool, but still a bit cumbersome to use. it felt like i had to adjust most of my code to the ccr, not like the ccr was fitting in to my code.. if that makes sense :P

anyhow, i dont feel that way about the tpl. the tpl feems more natural somehow :) so my question was more, "is the ccr really needed now that we (almost) have the tpl?"

but i havent really delved that deep in either of the libraries so im sure there a are stories optimal for each library :)

as a industrial developer though, i really like unification of these kinds of things and given the choise between the ccr and the tpl id go for the tpl :) (although, beeing a nosy little bugger i'd probobly learn both) but if the goodness from ccr could be integraten into the tpl, that whould be even better :) but i guess thats waht you're working on now :)

Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Ed Essey — Fri, 06 Jun 2008 19:52:15 GMT

Regarding the CCR, someone asked a question related to this on Soma's blog: http://blogs.msdn.com/somasegar/archive/2008/06/02/june-2008-ctp-parallel-extensions-to-the-net-fx.aspx

...and Alpa Agarwal, a colleague of mine answered:
The Concurrency and Coordination Runtime (CCR) and the Task Parallel Library (TPL) are complementary technologies. TPL, which provides support for imperative data and task parallelism, is well suited for synchronous parallelism and patterns such as parallel loops. The Concurrency and Coordination Runtime is well suited for orchestrating many asynchronous components and handling asynchronous I/O in a clever manner. Though TPL and CCR may seem slightly redundant on the surface, we encourage you to try our CTP of Parallel Extensions to the .NET Framework and to provide us with feedback.

Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Allan Lindqvist — Fri, 06 Jun 2008 09:13:06 GMT

cool cool :) i like the lazyinit Alot :) no more

public TheThing{
get{
if(thing_ == null)
thing_ = new Thing();

return thing_;
}
}

for me :D

got a question though, how does the tpl relate to the ccr? was the ccr more of a incubation project? or does tpl replace ccr?

and another thing (nagging a bit here :) ) what happend to the accelerator project? :) (the gpu accelerated library) it seems it whould fit in very well in tpl :) and it was soo cool :D love to hear more about that project and whats happening there :)

---edit---

sort of got my question awsered at 45:xx but if more details could be had i'd be very very happy :) especially around the talk with the accelerator guys :)

Re: Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Ben Hayat — Fri, 06 Jun 2008 02:27:34 GMT

To Charles and Joe;

Thanks for the reply. I'm sure Andres has left the Parallel Ext in good hands!

..Ben

Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

joedu — Fri, 06 Jun 2008 01:34:20 GMT

Anders was very instrumental in getting Parallel Extensions off the ground and designed right. He's still involved regularly on hard design problems, but is a busy guy and works on a lot of things across the company.

---joe

Re: Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Johannes Edstoft Hansen — Fri, 06 Jun 2008 00:37:28 GMT

Was blank the first time I saw the comment too, but now it shows up fine... An Edit perhaps?

Edit: Nope he didn't edit it... Now it's blank again?

Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Charles — Thu, 05 Jun 2008 20:27:54 GMT

We probably should not allow blank comments.....
C

Re: Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Charles — Thu, 05 Jun 2008 20:27:25 GMT

Anders does not work on this, specifically (besides some form of architectural and other high level guidance)......
C

Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Ben Hayat — Thu, 05 Jun 2008 19:55:03 GMT

Where is Anders Hejlsberg?

Re: Inside Parallel Extensions for .NET 2008 CTP Part 1

Suresh Sreedharan — Thu, 05 Jun 2008 19:17:41 GMT