Agreed.
How could I forget to mention mpirun?! :(
I don't know what Jorge is trying to achieve,
but with mpirun it is easy to launch multiple copies of
serial programs, or different serial programs,
with command line options such as this:
mpirun -np 1 --host a hostname : -np 2 --host b,c uptime
Runs one copy of the executable hostname on host a. And
runs one copy of the executable uptime on hosts b and c.
Another alternative is to use the '--app <appfile>' option.
Jorge may want to check 'man mpiexec'.
Gus Correa
Ralph Castain wrote:
If that is what you are trying to do,
mpirun will do it just fine too -
it doesn't have to be an MPI program.
On Oct 19, 2011, at 3:37 PM, Gus Correa wrote:
Jorge
Besides what Reuti and Eugene said, in case what you're looking for
is a mechanism to launch several copies of a
serial [non-parallel] program in a cluster,
you could try these alternatives:
1) Launch several jobs to run the same program,
using a job scheduler like Torque or Grid Engine.
http://www.adaptivecomputing.com/resources/docs/torque/
http://www.adaptivecomputing.com/resources/downloads.php
[Torque may be available through your Linux package manager: yum,
apt-get, etc.]
http://gridscheduler.sourceforge.net/
2) Use a distributed/parallel shell like pdsh, tentakel, etc,
to launch many copies of the serial program:
http://sourceforge.net/projects/pdsh/
https://computing.llnl.gov/linux/pdsh.html
http://freshmeat.net/projects/tentakel/
Some of these items may be already installed in your cluster.
My two cents.
Gus Correa
Reuti wrote:
Hi,
Am 19.10.2011 um 17:57 schrieb Jorge Jaramillo:
Hello everyone, I have a doubt about how to execute a parallel application on a
cluster. I used the 'mpirun' to execute some applications and they worked, but
I guess this command only is useful with MPI applications.
correct.
My question is, How do I execute a program that has no MPI statements on the
cluster?
"In the cluster" could also mean "How to submit a job to a cluster, which would then
in turn runs local on a granted machine". But I think you mean this in the context, that you
have just a bunch of machines with just MPI installed.
If it is not possible, how do I change the structure of the program so it can
be executed as a parallel application?
This depends on the application: sometimes you could just parallelize some
loops, in some cases you have to change the used algorithm to replace it with
one which can easily be parallelized, maybe the data structure needs to be
changed and you have to think about how to distribute data to the nodes,...
It might also be, that using Open MP (which works only on one and the same
machine) will give you a parallel version faster. http://openmp.org/wp/
Nowadays many compilers support it. Nevertheless you have to touch your
application by hand and modify the source.
-- Reuti
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