"w" == wolfie2k7 writes:

w On Mon, 15 Oct 2007 10:19:30 -0700, Bob Fry
w
w wrote:

From:
] On Behalf Of Justin Penney
Sent: Thursday, October 11, 2007 8:17 AM To:
Subject: [Beowulf] Intel quad core
nodes?

I recently ran a customer's weather modeling code on a variety
of machines. This program is very sensitive to memory. The
following are the run times while running 4 processes. Please
note that the Xeon, Opteron and Barcelona numbers are from dual
socket machines.

Core 2 Quad 2.4 GHz - 3h16m Xeon Quad 2.0 GHz - 2h51m Barcelona
2.0 GHz - 1h40m Opteron 2220SE 2.8 GHz - 2h24m

At 8 processes:

Xeon Quad 2.0 GHz - 2h52m Barcelona 2.0 GHz - 1h22m

w Sweet! Just a couple of questions - how were these chips rigged
w up? How much RAM on board? What OS were you running? Details,
w man! Details!

Looks like we'll have to wait a bit:

From: ] On Behalf Of Justin Penney
Sent: Monday, October 15, 2007 11:57 AM
To:
Subject: [Beowulf] Intel quad core nodes?

I assume these are all one-system results?
MPI or OpenMP?
Looks like the Xeon Quad and Barcelona results must have been run with
2 processes per socket?
Was it one executable? Compiled/optimized on what platform?

Very interesting data, you may just want to provide the list with some
additional details, so they know what to make of the data.

-Tom

These are single system results with MVAPICH. They will run on
InfiniBand which is why MVAPICH was used.

The quad core runs were 2 processes per socket.

The executables were created with the latest Portland Group f90 and
the optimisation flags were used for each chip. The Barcelona binary
used "-tp barcelona-64" and the Xeon binary used "-tp core2-64."

As soon as I am able I will be running this test on Harpertown
[note: http://en.wikipedia.org/wiki/Xeon#54...ries_Wolfdale]
processors. I should then have permission to publish the details of
the testing.

--
justin penney
email:
phone: 913.643.0300 option 2
im: http://livehelp.advancedclustering.com/

_______________________________________________
Beowulf mailing list,

--
The reasonable man adjusts himself to the world, the unreasonable one
persists in trying to adapt the world to himself; therefore all
progress depends on the unreasonable man.
~ George Bernard Shaw