Yes, we find its best to let users benchmark their code (if they
have it already) Or a code that uses similar algorithms. And then
have the user run on some machines we set aside.
While we are on the benchmark topic, Users might be interested, we
just installed a new set of Opteron 2220se's, We used HPL with GOTO
blas and on 58 machines (232 cpus) achieved 1.099 Tflop, (85% of
theory)
On one node using 4 cpus (duel core duel socket) I could only get
88% so for a machine that had __no tuning__ of the IB network or the
sysctl, We were very happy.
Boy i love that compile one run on any network of Openmpi.
Info:
OS: RHEL4
Compiler: pgi/6.2
mpi: openmpi/1.2.0
BLAS: GOTO-1.15
Cisco Topspin infiniband using openIB provided by redhat.
Thanks for all the help list :-)
Brock Palen
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Jun 11, 2007, at 9:06 AM, Jeff Pummill wrote:
Glad to contribute Victor!
I am running on a home workstation that uses an AMD 3800 cpu
attached to 2 gigs of ram.
My timings for FT were 175 secs with one core and 110 on two cores
with -O3 and -mtune=amd64 as tuning options.
Brock, Terry and Jeff are all exactly correct in their comments
regarding benchmarks. There are simply too many variables to
contend with. In addition, one and two core runs on a single
workstation probably isn't the best evaluation of OpenMPI. As you
expand to more devices and generate bigger problems (HPL or HPCC
for example), a better overall picture will emerge.
Jeff F. Pummill
Senior Linux Cluster Administrator
University of Arkansas
victor marian wrote:
Thank you everybody for the advices.
I ran the NAS benchmark class B and it runs in 181
seconds on one core and in 90 seconds on two cores, so
it scales almost perfectly.
What were your timings, Jeff, and what processor do
you exactly have?
Mine is a Pentium D at 2.8GHz.
Victor
--- Jeff Pummill <jpum...@uark.edu> wrote:
Victor,
Build the FT benchmark and build it as a class B
problem. This will run
in the 1-2 minute range instead of 2-4 seconds the
CG class A benchmark
does.
Jeff F. Pummill
Senior Linux Cluster Administrator
University of Arkansas
Terry Frankcombe wrote:
Hi Victor
I'd suggest 3 seconds of CPU time is far, far to
small a problem to do
scaling tests with. Even with only 2 CPUs, I
wouldn't go below 100
times that.
On Mon, 2007-06-11 at 01:10 -0700, victor marian
wrote:
Hi Jeff
I ran the NAS Parallel Bechmark and it gives for
me
-bash%/export/home/vmarian/fortran/benchmarks/NPB3.2/NPB3.2-MPI/bin$
mpirun -np 1 cg.A.1
---------------------------------------------------------------------
-----
[0,1,0]: uDAPL on host SERVSOLARIS was unable to
find
any NICs.
Another transport will be used instead, although
this
may result in
lower performance.
---------------------------------------------------------------------
-----
NAS Parallel Benchmarks 3.2 -- CG Benchmark
Size: 14000
Iterations: 15
Number of active processes: 1
Number of nonzeroes per row: 11
Eigenvalue shift: .200E+02
Benchmark completed
VERIFICATION SUCCESSFUL
Zeta is 0.171302350540E+02
Error is 0.512264003323E-13
CG Benchmark Completed.
Class = A
Size = 14000
Iterations = 15
Time in seconds = 3.02
Total processes = 1
Compiled procs = 1
Mop/s total = 495.93
Mop/s/process = 495.93
Operation type = floating point
Verification = SUCCESSFUL
Version = 3.2
Compile date = 11 Jun 2007
-bash%/export/home/vmarian/fortran/benchmarks/NPB3.2/NPB3.2-MPI/bin$
mpirun -np 2 cg.A.2
---------------------------------------------------------------------
-----
[0,1,0]: uDAPL on host SERVSOLARIS was unable to
find
any NICs.
Another transport will be used instead, although
this
may result in
lower performance.
---------------------------------------------------------------------
-----
---------------------------------------------------------------------
-----
[0,1,1]: uDAPL on host SERVSOLARIS was unable to
find
any NICs.
Another transport will be used instead, although
this
may result in
lower performance.
---------------------------------------------------------------------
-----
NAS Parallel Benchmarks 3.2 -- CG Benchmark
Size: 14000
Iterations: 15
Number of active processes: 2
Number of nonzeroes per row: 11
Eigenvalue shift: .200E+02
Benchmark completed
VERIFICATION SUCCESSFUL
Zeta is 0.171302350540E+02
Error is 0.522633719989E-13
CG Benchmark Completed.
Class = A
Size = 14000
Iterations = 15
Time in seconds = 2.47
Total processes = 2
Compiled procs = 2
Mop/s total = 606.32
Mop/s/process = 303.16
Operation type = floating point
Verification = SUCCESSFUL
Version = 3.2
Compile date = 11 Jun 2007
You can remark that the scalling is not so
good
like yours. Maibe I am having comunications
problems
between processors.
You can also remark that I am faster on one
process
concared to your processor.
Victor
--- Jeff Pummill <jpum...@uark.edu> wrote:
Perfect! Thanks Jeff!
The NAS Parallel Benchmark on a dual core AMD
machine now returns this...
[jpummil@localhost bin]$ mpirun -np 1 cg.A.1
NAS Parallel Benchmarks 3.2 -- CG Benchmark
CG Benchmark Completed.
Class = A
Size = 14000
Iterations = 15
Time in seconds = 4.75
Total processes = 1
Compiled procs = 1
Mop/s total = 315.32
...and...
[jpummil@localhost bin]$ mpirun -np 2 cg.A.2
NAS Parallel Benchmarks 3.2 -- CG Benchmark
CG Benchmark Completed.
Class = A
Size = 14000
Iterations = 15
Time in seconds = 2.48
Total processes = 2
Compiled procs = 2
Mop/s total = 604.46
Not quite linear, but one must account for all
of
the OS traffic that
one core or the other must deal with.
Jeff F. Pummill
Senior Linux Cluster Administrator
University of Arkansas
Fayetteville, Arkansas 72701
(479) 575 - 4590
http://hpc.uark.edu
"A supercomputer is a device for turning
compute-bound
problems into I/O-bound problems." -Seymour Cray
Jeff Squyres wrote:
Just remove the -L and -l arguments -- OMPI's
"mpif90" (and other
wrapper compilers) will do all that magic for
you.
=== message truncated ===>
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