[Mpi-forum] MPI-3 One-Sided Communications

[Jeff Hammond]

What does "allow for potentially lower bandwidth on long transfers as
a side effect" mean?  That one-sided should have lower latency at the
expense of lower bandwidth?  That's an unnecessary and intolerable
compromise.  ARMCI proves that one-sided bandwidth can equal if not
beat MPI (http://www.emsl.pnl.gov/docs/parsoft/armci/performance.htm).

Jeff

On Thu, Apr 23, 2009 at 7:32 PM, Anthony Skjellum <tony at cis.uab.edu> wrote:
> Hi, I was giving my opinion...
>
> The main requirements for one sided was achieve lower latency than two sided (as well as one sidedness), and allow for potentially lower bandwidth on long transfers as a side effect... What one sided achieved is higher latency and higher bandwidth in typical (quality) implementations.  The api is consequently a mismatch to its original purpose... It diverged from its design center.. Missed the mark... Way too complex compared to simple put and get.
>
> Starting again from first principles with the goal of very low latency remote put and get without the legacy of existing one sided is my suggestion.
>
> In other words : Start over.
>
> Perhaps that is why now we have an active messages group?
> Not sure.
>
>
>
> Tony
> Anthony Skjellum, PhD
> Professor and Chair
> Dept. of Computer and Information Sciences
> University of Alabama at Birmingham
> +1-205-807-4968
>
> -----Original Message-----
> From: Vinod tipparaju <tipparajuv at hotmail.com>
>
> Date: Thu, 23 Apr 2009 20:09:38
> To: <mpi-forum at lists.mpi-forum.org>
> Subject: Re: [Mpi-forum] MPI-3 One-Sided Communications
>
>
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-- 
Jeff Hammond
The University of Chicago
http://home.uchicago.edu/~jhammond/