C++ inventor Bjarne Stroustrup answers the Multicore Proust Questionnaire

gremlin

http://www.cilk.com/multicore-blog/b...-Questionnaire

Sep 27 '08 #1

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2150

asm23

gremlin wrote:

http://www.cilk.com/multicore-blog/b...-Questionnaire

It's an interesting interview.

Sep 28 '08 #2

Chris M. Thomasson

"gremlin" <gr*****@roseta ttoo.comwrote in message
news:v5******** *************** *******@comcast .com...

http://www.cilk.com/multicore-blog/b...-Questionnaire

I get a not found error:

The requested URL
/multicore-blog/bid/6703/C-Inventor-Bjarne-Stroustrup-answers-the-Multicore-Proust-Questionnaire
was not found on this server.

Where is the correct location?

Sep 28 '08 #3

Ian Collins

Chris M. Thomasson wrote:

"gremlin" <gr*****@roseta ttoo.comwrote in message
news:v5******** *************** *******@comcast .com...
>http://www.cilk.com/multicore-blog/b...-Questionnaire

I get a not found error:

The requested URL
/multicore-blog/bid/6703/C-Inventor-Bjarne-Stroustrup-answers-the-Multicore-Proust-Questionnaire
was not found on this server.

Where is the correct location?

The link is the correct location I just tried it.

--
Ian Collins.

Sep 28 '08 #4

Chris M. Thomasson

"Ian Collins" <ia******@hotma il.comwrote in message
news:6k******** ****@mid.indivi dual.net...

Chris M. Thomasson wrote:
>"gremlin" <gr*****@roseta ttoo.comwrote in message
news:v5******* *************** ********@comcas t.com...
>>http://www.cilk.com/multicore-blog/b...-Questionnaire

I get a not found error:

The requested URL
/multicore-blog/bid/6703/C-Inventor-Bjarne-Stroustrup-answers-the-Multicore-Proust-Questionnaire
was not found on this server.

Where is the correct location?

The link is the correct location I just tried it.

Hey, it works now! Weird; perhaps temporary server glitch. Who knows.

;^/

Sep 28 '08 #5

Chris M. Thomasson

"Chris M. Thomasson" <no@spam.invali dwrote in message
news:Gx******** **********@news fe12.iad...

"Ian Collins" <ia******@hotma il.comwrote in message
news:6k******** ****@mid.indivi dual.net...
>Chris M. Thomasson wrote:
>>"gremlin" <gr*****@roseta ttoo.comwrote in message
news:v5****** *************** *********@comca st.com...
http://www.cilk.com/multicore-blog/b...-Questionnaire
I get a not found error:

The requested URL
/multicore-blog/bid/6703/C-Inventor-Bjarne-Stroustrup-answers-the-Multicore-Proust-Questionnaire
was not found on this server.

Where is the correct location?

The link is the correct location I just tried it.

Hey, it works now! Weird; perhaps temporary server glitch. Who knows.

;^/

Q: The most important problem to solve for multicore software:

A: How to simplify the expression of potential parallelism.
Humm... What about scalability? That's a very important problem to solve.
Perhaps the most important. STM simplifies expression of parallelism, but
its not really scaleable at all.

I guess I would have answered:
CT-A: How to simplify the expression of potential parallelism __without
sacrificing scalability__.

Q: My worst fear about how multicore technology might evolve:

A: Threads on steroids.
Well, threads on steroids and proper distributed algorihtms can address the
scalability issue. Nothing wrong with threading on steroids. Don't be
afraid!!!!! I am a threading freak, so I am oh so VERY BIASED!!! ;^|

Oh well, that my 2 cents.

Sep 28 '08 #6

Ian Collins

Chris M. Thomasson wrote:

"Ian Collins" <ia******@hotma il.comwrote in message
news:6k******** ****@mid.indivi dual.net...
>Chris M. Thomasson wrote:
>>"gremlin" <gr*****@roseta ttoo.comwrote in message
news:v5****** *************** *********@comca st.com...
http://www.cilk.com/multicore-blog/b...-Questionnaire

I get a not found error:

The requested URL
/multicore-blog/bid/6703/C-Inventor-Bjarne-Stroustrup-answers-the-Multicore-Proust-Questionnaire

was not found on this server.

Where is the correct location?

The link is the correct location I just tried it.

Hey, it works now! Weird; perhaps temporary server glitch. Who knows.

Well it is running on windows :)

--
Ian Collins.

Sep 28 '08 #7

blargg

In article <2G************ *****@newsfe12. iad>, "Chris M. Thomasson"
<no@spam.invali dwrote:

"Chris M. Thomasson" <no@spam.invali dwrote in message
news:Gx******** **********@news fe12.iad...
"Ian Collins" <ia******@hotma il.comwrote in message
news:6k******** ****@mid.indivi dual.net...
Chris M. Thomasson wrote:
"gremlin" <gr*****@roseta ttoo.comwrote in message
news:v5******* *************** ********@comcas t.com...

http://www.cilk.com/multicore-blog/b...-Questionnaire
[...]

Q: The most important problem to solve for multicore software:

A: How to simplify the expression of potential parallelism.
Humm... What about scalability? That's a very important problem to solve.
Perhaps the most important. STM simplifies expression of parallelism, but
its not really scaleable at all.

I guess I would have answered:

CT-A: How to simplify the expression of potential parallelism __without
sacrificing scalability__.
Q: My worst fear about how multicore technology might evolve:

A: Threads on steroids.
Well, threads on steroids and proper distributed algorihtms can address the
scalability issue. Nothing wrong with threading on steroids. Don't be
afraid!!!!! I am a threading freak, so I am oh so VERY BIASED!!! ;^|

Sounds like Stroustrup wants to minimize extra notation in source code
relating to parallel execution, to not have it take on a life of its own.
Exceptions might be an example of minimal impact, where lots of code
doesn't require any explicit mention of handling exceptions.

Sep 28 '08 #8

James Kanze

On Sep 28, 6:31 am, "Chris M. Thomasson" <n...@spam.inva lidwrote:

"Chris M. Thomasson" <n...@spam.inva lidwrote in
messagenews:Gx* *************** **@newsfe12.iad ...
"Ian Collins" <ian-n...@hotmail.co mwrote in message
news:6k******** ****@mid.indivi dual.net...
Chris M. Thomasson wrote:
"gremlin" <grem...@roseta ttoo.comwrote in message
news:v5****** *************** *********@comca st.com...
http://www.cilk.com/multicore-blog/b...Bjarne-Stroust....

[...]

Q: The most important problem to solve for multicore software:

A: How to simplify the expression of potential parallelism.

Humm... What about scalability? That's a very important
problem to solve. Perhaps the most important. STM simplifies
expression of parallelism, but its not really scaleable at
all.

And what do you think simplifying the expression of potential
parallelism achieves, if not scalability?

[...]

Q: My worst fear about how multicore technology might evolve:

A: Threads on steroids.

Well, threads on steroids and proper distributed algorihtms
can address the scalability issue. Nothing wrong with
threading on steroids. Don't be afraid!!!!! I am a threading
freak, so I am oh so VERY BIASED!!! ;^|

I'm not too sure what Stroustrup was getting at here, but having
to write explicitly multithreaded code (with e.g. manual locking
and synchronization ) is not a good way to achieve scalability.
Futures are probably significantly easier to use, and in modern
Fortran, if I'm not mistaken, there are special constructs to
tell the compiler that certain operations can be parallelized.
And back some years ago, there was a fair amount of research
concerning automatic parallelization by the compiler; I don't
know where it is now.

Of course, a lot depends on the application. In my server,
there's really nothing that could be parallelized in a given
transaction, but we can run many transactions in parallel. For
that particular model of parallelization , classical explicit
threading works fine.

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

Sep 28 '08 #9

Ian Collins

James Kanze wrote:

On Sep 28, 6:31 am, "Chris M. Thomasson" <n...@spam.inva lidwrote:

>A: Threads on steroids.

>Well, threads on steroids and proper distributed algorihtms
can address the scalability issue. Nothing wrong with
threading on steroids. Don't be afraid!!!!! I am a threading
freak, so I am oh so VERY BIASED!!! ;^|

I'm not too sure what Stroustrup was getting at here, but having
to write explicitly multithreaded code (with e.g. manual locking
and synchronization ) is not a good way to achieve scalability.
Futures are probably significantly easier to use, and in modern
Fortran, if I'm not mistaken, there are special constructs to
tell the compiler that certain operations can be parallelized.
And back some years ago, there was a fair amount of research
concerning automatic parallelization by the compiler; I don't
know where it is now.

We along with Fortran and C programmers, can use OpenMP which from my
limited experience with, works very well.

--
Ian Collins.

Sep 28 '08 #10

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