[Beowulf] Using Autoparallel compilers or Multi-Threaded librarieswith MPI

Eray Ozkural examachine at gmail.com
Fri Dec 14 12:49:30 EST 2007


On Dec 14, 2007 6:41 PM, Tom Elken <tom.elken at qlogic.com> wrote:
> > -----Original Message-----
> > From: Eray Ozkural [mailto:examachine at gmail.com]
> > Well, then, is there really such a thing that extracts
> > threads from those
> > horrible C codes and generates MPI code?
>
> I have heard of SW tools that try to do some of that, but they did not
> achieve much commercial success.
> But that is not what I meant.

Sorry for the misunderstanding.

> I guess I was relying on memory of readers about my original post about
> this subject.  Since that post was way back in November, that was a
> dangerous assumption.  Thankfully we have an archive:
> http://www.beowulf.org/archive/2007-November/020211.html
>
> 'Autoparallel features with MPI' came from this in the original post:
> "I was wondering how many people use either auto-parallel compiler
> features, or multi-threaded math libraries (Goto, MKL, ACML, etc.) to
> provide some thread-level parallelism on a cluster where you primarily
> use MPI to achieve your parallel execution.*"
>
> So I meant that the source code is parallelized using MPI.  Then in an
> effort to create something like a hybrid MPI/OpenMP program, but without
> having to add the OpenMP directives, you use the automatic
> parallelization feature of common compilers:
> -parallel  in the Intel compiler
> -apo       in the PathScale compiler
> -Mconcur   in the PGI compiler,  etc.
> to find loops which can profitably be parallelized using threads.

Well, then, I seem to recall, only in a very blurred fashion, some pragmas of
the SGI compiler. I even recall there was support in STL, or maybe I am
making up things. Quite possible.

I hadn't realized there was auto parallel features in so many compilers,
thank you for  the information. Do these guys work well?

Best,

-- 
Eray Ozkural, PhD candidate.  Comp. Sci. Dept., Bilkent University, Ankara
http://www.cs.bilkent.edu.tr/~erayo  Malfunct: http://myspace.com/malfunct
ai-philosophy: http://groups.yahoo.com/group/ai-philosophy
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