[Numpy-discussion] ParallelProgramming wiki page

2008-10-27 Thread Robin 
Hi,

I made some changes to the ParallelProgramming wiki page to outline
use of the (multi)processing module as well as the threading module.

I'm very much not an expert on this - just researched it for myself,
so please feel free to correct/ extend/ delete as appropriate.

Robin
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Re: [Numpy-discussion] ParallelProgramming wiki page

2008-10-27 Thread Sebastien Binet 
On Monday 27 October 2008 12:56:56 Robin wrote:
 Hi,

 I made some changes to the ParallelProgramming wiki page to outline
 use of the (multi)processing module as well as the threading module.

 I'm very much not an expert on this - just researched it for myself,
 so please feel free to correct/ extend/ delete as appropriate.

I would mention the backport of multiprocessing for python-2.{4,5}:
 http://code.google.com/p/python-multiprocessing
so the amount of editing when one switches from 2.{4,5} to 2.6 is minimal :)

cheers,
sebastien.
-- 
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# Lawrence Berkeley National Lab.
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# Berkeley, CA 94720
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Re: [Numpy-discussion] ParallelProgramming wiki page

2008-10-27 Thread Robert Kern 
On Mon, Oct 27, 2008 at 15:20, Sebastien Binet
[EMAIL PROTECTED] wrote:
 On Monday 27 October 2008 12:56:56 Robin wrote:
 Hi,

 I made some changes to the ParallelProgramming wiki page to outline
 use of the (multi)processing module as well as the threading module.

 I'm very much not an expert on this - just researched it for myself,
 so please feel free to correct/ extend/ delete as appropriate.

 I would mention the backport of multiprocessing for python-2.{4,5}:
  http://code.google.com/p/python-multiprocessing
 so the amount of editing when one switches from 2.{4,5} to 2.6 is minimal :)

Go for it. The wiki is open to editing.

-- 
Robert Kern

I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth.
  -- Umberto Eco
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Re: [Numpy-discussion] ParallelProgramming wiki page

2008-10-27 Thread dmitrey 
Did you mean this one
http://www.netlib.org/scalapack/pblas_qref.html
?

As for the ParallelProgramming wiki page, there are some words in 
section Use parallel primitives about numpy.dot still I can't 
understand from the section: if I get numpy from sources and compile it 
(via python setup.py build) in my AMD X2, will numpy.dot use 2nd CPU 
or not?

Regards, D.

Frédéric Bastien wrote:
 Hi,

 Their exist open source version of parallel BLAS library. I modified
 the section Use parallel primitives to tell it. But my English is
 bad, so if someone can check it, it would be nice.

 Fred

 On Mon, Oct 27, 2008 at 4:24 PM, Robert Kern [EMAIL PROTECTED] wrote:
   
 On Mon, Oct 27, 2008 at 15:20, Sebastien Binet
 [EMAIL PROTECTED] wrote:
 
 On Monday 27 October 2008 12:56:56 Robin wrote:
   
 Hi,

 I made some changes to the ParallelProgramming wiki page to outline
 use of the (multi)processing module as well as the threading module.

 I'm very much not an expert on this - just researched it for myself,
 so please feel free to correct/ extend/ delete as appropriate.
 
 I would mention the backport of multiprocessing for python-2.{4,5}:
  http://code.google.com/p/python-multiprocessing
 so the amount of editing when one switches from 2.{4,5} to 2.6 is minimal :)
   
 Go for it. The wiki is open to editing.

 --
 Robert Kern

 I have come to believe that the whole world is an enigma, a harmless
 enigma that is made terrible by our own mad attempt to interpret it as
 though it had an underlying truth.
  -- Umberto Eco
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Re: [Numpy-discussion] ParallelProgramming wiki page

2008-10-27 Thread Robin 
On Mon, Oct 27, 2008 at 9:17 PM, dmitrey [EMAIL PROTECTED] wrote:
 As for the ParallelProgramming wiki page, there are some words in
 section Use parallel primitives about numpy.dot still I can't
 understand from the section: if I get numpy from sources and compile it
 (via python setup.py build) in my AMD X2, will numpy.dot use 2nd CPU
 or not?

Not unless you build numpy against a paralell enabled BLAS, for
example Intel MKL, ATLAS etc.

I think if you compile ATLAS with threading enabled, and then build
numpy using the appropriate ptlapack libraries (I forget the exact
name) then the dot should use the second CPU. As Frederic added to the
wiki - the number of threads to use can only be provided to atlas at
compile time.

With MKL I think you can choose this at run time (I think through an
environment variable but I'm not sure).

Similarly with the GOTO blas, but I'm not sure if numpy builds with
that, so maybe we should take that reference out.

Robin
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