Dear David,
Thank you for your reply, but does that mean the traditional PGAS
programming language does not present Intra-level parallelism (as in
threads)? and it only provides Inter-level parallelism as in executing on
different Processing Elements.
Where as APGAS, provides both level of parallelism.
am I right?
I hope I get my other questions answered too :)
Thank you all
On Sun, Aug 1, 2010 at 1:55 PM, Dave Hudak <dhu...@osc.edu> wrote:
>
> On Aug 1, 2010, at 7:47 AM, mohammed elsaeedy wrote:
>
> > Dear List,
> >
> > I have some questions regarding PGAS and X10,
> >
> > 1) One of the goals for PGAS languages is:
> > *One-sided communication for improved inter-process performance, *how is
> > that achieved, if I'm compiling with an x10rt of MPI flavor, which is
> > eventually a *Two**-sided communication.*
> > *
> > *
> > *2)How is the "async" implemented under the hoods? is it POSIX threads or
> is
> > it OpenMP?*
> > *
> > *
> > *3) X10 and Chapel are APGAS, what is the difference between APGAS and
> PGAS
> > langauges?
>
> I'll try this one. APGAS is shorthand for "asynchronous PGAS".
> Traditional PGAS implementations (UPC and Co-Array FORTRAN) use an
> MPI-style execution called SPMD (single-program, multiple data) in which a
> fixed number of parallel threads are created at the beginning of the program
> and all exist until the end of the program. In asynchronous PGAS, the
> programmer can create threads during the execution of the program (e.g.,
> using the async or at commands in X10).
>
> Thanks,
> Dave
>
> > *
> > --
> > Thank you for your concern.
> > Regards,
> > Mohammed El Sayed
> >
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> ---
> David E. Hudak, Ph.D. dhu...@osc.edu
> Program Director, HPC Engineering
> Ohio Supercomputer Center
> http://www.osc.edu
>
>
>
>
>
>
>
>
>
>
>
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--
Thank you for your concern.
Regards,
Mohammed El Sayed
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