Henry,
Apologies ahead of time for any unintended insults, but...
Your "a.out" sounds like it is not truly a parallel code. If you
submit a hello_world program using OpenMPI's mpirun, you will simply
get two copies of "Hello World" printed to the screen.
If you want the work shared, you must change your serial program
such that it executes different code pieces or operates on different
portions of your data, based on something like the "rank" of the
process. (Rank is the numerical ID assigned by MPI to each process
running from a single invocation of mpirun.)
All MPI, or specifically OpenMPI, provides you is a vehicle to
launch multiple copies of a program or programs and then to
facilitate the communication of those separate processes with
one another.
Perhaps a primer on parallel processing would be in order. Or since
you have started with Message Passing, perhaps the old standard
"Using MPI Portable Parallel Programming with the Message-Passing
Interface, MIT Press, by Gropp, Lusk, and Skjellum would give you
the familiarization needed. Other books in that series by some of
the same authors are also good starting points for MPI. I'm sure
other readers can pipe in with a host of better references.
Good luck.
regards,
Henry Adolfo Lambis Miranda wrote:
Hi everybody out there.....
This is my first post to the mail list.
I have installed openmp 1.2.4 over a x_64 AMD double processor with SuSE
linux.
In principal, the instalation was succefull, with ifort 10.X.
But when i run any code ( mpirun -np 2 a.out), instead of share the
calcules between the two
processor, the system duplicate the executable and send one to each
processor.
i don´t know what the h$%& is going on......
regards..
Henry
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