Global Shared Memory and SCI/Dolphin

Steffen Persvold sp at scali.com
Mon Jul 21 10:54:31 EDT 2003


On Mon, 21 Jul 2003, Richard Walsh wrote:

> 
> Steffen Persvold wrote:
> 
> >Our message passing software may runs on all four interconnects (and ethernet).
> 
>  But the one-sided features of the (cray-like) SHMEM and MPI-2 libraries
>  need underlying hardware support to perform.  You must be saying that the
>  Scali implements the MPI-2 one-sided routines and they can be called even
>  over Ethernet, but are actually two-sided emulations with two-sided performance
>  on latency (on Ethernet), right?

We don't have MPI-2 one-sided, yet, but since we now run on several 
interconnects, when we implement it we will use the hardware RDMA features 
where we can and emulate it where we can't, yes.

Regards,
-- 
      Steffen Persvold           ,,,       mailto: sp at scali.com
   Senior Software Engineer     (o-o)      http://www.scali.com
-----------------------------oOO-(_)-OOo-----------------------------
Scali AS, PObox 150, Oppsal, N-0619 Oslo, Norway, Tel: +4792484511

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