Re: [Haskell-cafe] Parallelism on concurrent?
On Mar 13, 2007, at 17:26 , Dusan Kolar wrote: Hello all, I'm googling around haskell.org to get some deeper knowledge about Control.Parallel.Strategies than it is presented on http:// www.haskell.org/ghc/docs/latest/html/libraries/base/Control- Parallel-Strategies.html BTW, could someone point me to some more deeper doc. about it? During googling I've discovered that since GHC 6.6, par, forkIO, and forkOS should make the stuff run in parallel if I have more than one CPU core. Is that right? I think not, because on my machine only par makes the things run in parallel and only during the computation (GC runs in a single thread). If it should work, how can I verify that my installation is correct? If it should not work, will it be working someday? Thanks for your patience, responses, and tips Dusan There's a bit more Haddock for Control.Parallel.Strategies in the current darcs version: http://www.haskell.org/ghc/dist/current/docs/libraries/base/Control- Parallel-Strategies.html /Björn___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Parallelism on concurrent?
On Tue, Mar 13, 2007 at 09:41:47PM +0300, Bulat Ziganshin wrote: > > Tuesday, March 13, 2007, 9:06:31 PM, you wrote: > > > forkOS should work as well, assuming you have OS threads, like in linux 2.6. > > You should probably be using the -smp compiler flag and not the -threaded > > compiler flag, I'm guessing, and make sure that your +RTS arguments indicate > > that you want to use X total concurrent threads... > > there is no need to use any > compiler flags, because now it is default. You do need to use -threaded, it's not the default yet. You might be confusing this with ghc itself being built with -threaded by default. Also, there are plans to make -threaded on by default in the future. Thanks Ian ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re[2]: [Haskell-cafe] Parallelism on concurrent?
Hello Jefferson, Tuesday, March 13, 2007, 9:06:31 PM, you wrote: > forkOS should work as well, assuming you have OS threads, like in linux 2.6. > You should probably be using the -smp compiler flag and not the -threaded > compiler flag, I'm guessing, and make sure that your +RTS arguments indicate > that you want to use X total concurrent threads... oh... forkOS=forkIO for this case. there is no need to use any compiler flags, because now it is default. you should use +RTS -N2 flag in order to utilize both cores. more info at http://haskell.org/ghc/docs/6.6/html/users_guide/release-6-6.html -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Parallelism on concurrent?
forkOS should work as well, assuming you have OS threads, like in linux 2.6.
You should probably be using the -smp compiler flag and not the -threaded
compiler flag, I'm guessing, and make sure that your +RTS arguments indicate
that you want to use X total concurrent threads...
-- Jeff
On Tuesday 13 March 2007 13:10, Dusan Kolar wrote:
> Yes, it works for operator /par/. That's what I've reported. But should
> it work for forkIO and forkOS? Could anybody give more detailed answer
> than yes, no? :-) (Link to the Web is OK.)
>
> BTW, thanks for the link to the paper (moreover, I can see, that
> googling over haskell.org is not sufficient ;-) ).
>
> Regards,
>
> Dusan
>
> Pepe Iborra wrote:
> > On 13/03/2007, at 17:46, Jefferson Heard wrote:
> >> Simon will probably chime in on it as well, but his paper on the
> >> subject is
> >> the best there is:
> >>
> >> http://research.microsoft.com/~simonpj/Papers/strategies.ps.gz
> >
> > It does work in GHC 6.6 very nicely.
> > You can try it with the following naive fib function, extracted from
> > the paper mentioned above:
> >
> > \begin{code}
> > import Control.Parallel
> > import System.Environment
> > import Fib
> >
> > main = do
> >(x:_) <- getArgs
> >print$ pfib (read x)
> >
> > pfib 0 = 1
> > pfib 1 = 1
> > pfib n = n1 `par` n2 `seq` n1+n2+1
> > where (n1,n2) = (pfib(n-1), pfib(n-2))
> > \end{code}
> >
> > pep:~/code/snippets/Parallelism$ ghc --make -O Main -threaded
> >
> > pep:~/code/snippets/Parallelism$ time src/Main 33
> > 11405773
> >
> > real0m1.444s
> > user0m1.343s
> > sys 0m0.020s
> >
> > pep:~/code/snippets/Parallelism$ time src/Main 33 +RTS -N2
> > 11405773
> >
> > real0m0.764s
> > user0m1.367s
> > sys 0m0.030s
> >
> >
> >
> > Got a speedup of 100%, and didn't use threads at all. Yay!
> >
> > pepe
> >
> > ___
> > Haskell-Cafe mailing list
> > Haskell-Cafe@haskell.org
> > http://www.haskell.org/mailman/listinfo/haskell-cafe
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Re: [Haskell-cafe] Parallelism on concurrent?
Excuse me, I read too quick.
It works for forkIO too, although I'm not sure about forkOS. I don't
have a demo around, but you can verify with the concurrency demos in
the wiki:
http://haskell.org/haskellwiki/Concurrency_demos/Zeta
If it doesn't work, perhaps you are in an unsupported platform.
Cheers
pepe
On 13/03/2007, at 18:10, Dusan Kolar wrote:
Yes, it works for operator /par/. That's what I've reported. But
should it work for forkIO and forkOS? Could anybody give more
detailed answer than yes, no? :-) (Link to the Web is OK.)
BTW, thanks for the link to the paper (moreover, I can see, that
googling over haskell.org is not sufficient ;-) ).
Regards,
Dusan
Pepe Iborra wrote:
On 13/03/2007, at 17:46, Jefferson Heard wrote:
Simon will probably chime in on it as well, but his paper on the
subject is
the best there is:
http://research.microsoft.com/~simonpj/Papers/strategies.ps.gz
It does work in GHC 6.6 very nicely.
You can try it with the following naive fib function, extracted
from the paper mentioned above:
\begin{code}
import Control.Parallel
import System.Environment
import Fib
main = do
(x:_) <- getArgs
print$ pfib (read x)
pfib 0 = 1
pfib 1 = 1
pfib n = n1 `par` n2 `seq` n1+n2+1
where (n1,n2) = (pfib(n-1), pfib(n-2))
\end{code}
pep:~/code/snippets/Parallelism$ ghc --make -O Main -threaded
pep:~/code/snippets/Parallelism$ time src/Main 33
11405773
real0m1.444s
user0m1.343s
sys 0m0.020s
pep:~/code/snippets/Parallelism$ time src/Main 33 +RTS -N2
11405773
real0m0.764s
user0m1.367s
sys 0m0.030s
Got a speedup of 100%, and didn't use threads at all. Yay!
pepe
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Re: [Haskell-cafe] Parallelism on concurrent?
Yes, it works for operator /par/. That's what I've reported. But should
it work for forkIO and forkOS? Could anybody give more detailed answer
than yes, no? :-) (Link to the Web is OK.)
BTW, thanks for the link to the paper (moreover, I can see, that
googling over haskell.org is not sufficient ;-) ).
Regards,
Dusan
Pepe Iborra wrote:
On 13/03/2007, at 17:46, Jefferson Heard wrote:
Simon will probably chime in on it as well, but his paper on the
subject is
the best there is:
http://research.microsoft.com/~simonpj/Papers/strategies.ps.gz
It does work in GHC 6.6 very nicely.
You can try it with the following naive fib function, extracted from
the paper mentioned above:
\begin{code}
import Control.Parallel
import System.Environment
import Fib
main = do
(x:_) <- getArgs
print$ pfib (read x)
pfib 0 = 1
pfib 1 = 1
pfib n = n1 `par` n2 `seq` n1+n2+1
where (n1,n2) = (pfib(n-1), pfib(n-2))
\end{code}
pep:~/code/snippets/Parallelism$ ghc --make -O Main -threaded
pep:~/code/snippets/Parallelism$ time src/Main 33
11405773
real0m1.444s
user0m1.343s
sys 0m0.020s
pep:~/code/snippets/Parallelism$ time src/Main 33 +RTS -N2
11405773
real0m0.764s
user0m1.367s
sys 0m0.030s
Got a speedup of 100%, and didn't use threads at all. Yay!
pepe
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UIFS FIT VUT Brno fax: +420 54 114 1270
Bozetechova 2 e-mail: [EMAIL PROTECTED]
Brno 612 66
Czech Republic
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Re: [Haskell-cafe] Parallelism on concurrent?
On 13/03/2007, at 17:46, Jefferson Heard wrote:
Simon will probably chime in on it as well, but his paper on the
subject is
the best there is:
http://research.microsoft.com/~simonpj/Papers/strategies.ps.gz
It does work in GHC 6.6 very nicely.
You can try it with the following naive fib function, extracted from
the paper mentioned above:
\begin{code}
import Control.Parallel
import System.Environment
import Fib
main = do
(x:_) <- getArgs
print$ pfib (read x)
pfib 0 = 1
pfib 1 = 1
pfib n = n1 `par` n2 `seq` n1+n2+1
where (n1,n2) = (pfib(n-1), pfib(n-2))
\end{code}
pep:~/code/snippets/Parallelism$ ghc --make -O Main -threaded
pep:~/code/snippets/Parallelism$ time src/Main 33
11405773
real0m1.444s
user0m1.343s
sys 0m0.020s
pep:~/code/snippets/Parallelism$ time src/Main 33 +RTS -N2
11405773
real0m0.764s
user0m1.367s
sys 0m0.030s
Got a speedup of 100%, and didn't use threads at all. Yay!
pepe
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Re: [Haskell-cafe] Parallelism on concurrent?
Simon will probably chime in on it as well, but his paper on the subject is the best there is: http://research.microsoft.com/~simonpj/Papers/strategies.ps.gz If you have questions about the paper, I'd be happy to help, too. I worked through it myself fairly recently. -- Jeff On Tuesday 13 March 2007 12:26, Dusan Kolar wrote: > Hello all, > > I'm googling around haskell.org to get some deeper knowledge about > Control.Parallel.Strategies than it is presented on > http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Parallel >-Strategies.html BTW, could someone point me to some more deeper doc. about > it? > > During googling I've discovered that since GHC 6.6, par, forkIO, and > forkOS should make the stuff run in parallel if I have more than one CPU > core. Is that right? I think not, because on my machine only par makes > the things run in parallel and only during the computation (GC runs in a > single thread). If it should work, how can I verify that my installation > is correct? If it should not work, will it be working someday? > > Thanks for your patience, responses, and tips > > Dusan > > ___ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Parallelism on concurrent?
Hello all, I'm googling around haskell.org to get some deeper knowledge about Control.Parallel.Strategies than it is presented on http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Parallel-Strategies.html BTW, could someone point me to some more deeper doc. about it? During googling I've discovered that since GHC 6.6, par, forkIO, and forkOS should make the stuff run in parallel if I have more than one CPU core. Is that right? I think not, because on my machine only par makes the things run in parallel and only during the computation (GC runs in a single thread). If it should work, how can I verify that my installation is correct? If it should not work, will it be working someday? Thanks for your patience, responses, and tips Dusan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
