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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