Hey Victor!

I just ran the old classic cpi.c just to verify that OpenMPI was working. Now I need to grab some actual benchmarking code.  I may try the NAS Parallel Benchmarks from here...

http://www.nas.nasa.gov/Resources/Software/npb.html

They were pretty easy to build and run under mpich. I can't imagine it'd be any different on OpenMPI.


Jeff F. Pummill



victor marian wrote:
  I can't turn it off right now to look in BIOS (the
computer is not at home), but I think the Pentium D
which is dual-core doesn't support hyper-threading. 
  The program I made relies on an MPI library (it is
not a benchmarking program). I think you are right,
maibe I should run a benchmarking program first to see
what happens. If you have a benchmarking program I
would gladly test it. 
   What is the best way to debug OpenMPI programs?
Until now I ran prism which is part of the
SunClusterTools.

                                      Victor

--- Jeff Pummill <jpummil@uark.edu> wrote:

  
Victor,

Just on a hunch, look in your BIOS to see if
Hyperthreading is turned 
on. If so, turn it off. We have seen some unusual
behavior on some of 
our machines unless this is disabled.

I am interested in your progress as I have just
begun working with 
OpenMPI as well. I have used mpich for quite some
time, but felt 
compelled to get some experience with OpenMPI as
well. I just installed 
it this weekend on an AMD dual-core machine with 2
gigs of ram. Maybe I 
will try and replicate your experiment if you can
direct me to what 
program you are benchmarking.

Jeff F. Pummill
Senior Linux Cluster Administrator
University of Arkansas
Fayetteville, Arkansas 72701
(479) 575 - 4590
http://hpc.uark.edu

victor marian wrote:
    
The problem is that my executable file runs on the
Pentium D in 80 seconds on two cores and in 25
      
seconds
    
on one core.
And on another Sun SMP machine with 20 processors
      
it
    
runs perfectly (the problem is perfectly
      
scallable).
    
          Victor Marian
      Laboratory of Machine Elements and Tribology
      University Politehnica of Bucharest
      Romania


--- Brock Palen <brockp@umich.edu> wrote:

  
      
It means that your OMPI was compiled to support
uDAPL  (a type of  
infinibad network)  but that your computer does
        
not
    
have such a card  
installed.  Because you dont it will fall back to
ethernet.  But  
because you are just running on a single machine.
        
You will use the  
fastest form of communication using shared
        
memory. 
    
so you can ignore  
that message.  Unless in the future you add a
        
uDAPL
    
powered network  
and you still get that message then you need to
worry.

Brock Palen
Center for Advanced Computing
brockp@umich.edu
(734)936-1985


On Jun 10, 2007, at 9:18 AM, victor marian wrote:

    
        
Hello,

I have a Pentium D computer with Solaris 10
      
          
installed.
    
        
I installed OpenMPI, succesfully compiled my
      
          
Fortran
    
        
program, but when giving
mpirun -np 2 progexe
I receive
[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.

I am a begginer in MPI and don't know what it
      
          
means.
    
        
What
 should I do to solve the problem?
Thank you.







      
          
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