LAM/MPI logo

LAM/MPI General User's Mailing List Archives

  |   Home   |   Download   |   Documentation   |   FAQ   |   all just in this list

From: Matthew Bettencourt (matt_at_[hidden])
Date: 2003-07-17 18:50:25


Quoting David Singleton <dbs900_at_[hidden]>:

>
> On Thu, Jul 17, 2003 at 03:26:48PM -0500, Matthew Bettencourt wrote:
> >
> > Performance issue.
> > On these SP systems I am noticing a latency of a MPI_Send/Recv of about
> > 1.2 to 1.5ms. Is this typical. With the native MPI I am getting
> > someing like .3ms or a factor of 4 better. I am trying using the IBM's
> > Colony switch for communication (binding to that IP vs the ethernet IP
> > on lamboot)
> >
>
> Are these milliseconds or microseconds? (They're often "ms" and "us"
> respectively.)

milli, so it is .0015 vs .0003 seconds
Matt

>
> David
>
> --------------------------------------------------------------------------
> ANU Supercomputer Facility
> David.Singleton_at_[hidden] and APAC National Facility
> Phone: +61 2 6125 4389 Leonard Huxley Bldg (No. 56)
> Fax: +61 2 6125 8199 Australian National University
> Canberra, ACT, 0200, Australia
> --------------------------------------------------------------------------
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>

-------------------------------------------------
This mail sent through IMP: http://horde.org/imp/