openmpi versus mpich2
raramayo at gmail.com
Mon Aug 8 11:36:53 PDT 2011
And we do no have a port for openmp....;((
On Mon, Aug 8, 2011 at 13:25, Jason Swails <jason.swails at gmail.com> wrote:
> On Mon, Aug 8, 2011 at 2:19 PM, Rodolfo Aramayo <raramayo at gmail.com> wrote:
>> The developer of the package I want to run (Velvet) told me I should
>> just install 'libgomp'
>> Can you guys translate this for me?
>> Is he talking about openmpi or mpich2?? or something else??
> Something else. libgomp is the GNU implementation of the OpenMP
> parallelization scheme. Note that OpenMPI and mpich2 are both message
> passing interface (MPI) implementations designed for shared and distributed
> memory systems (oversimplified; multi-core computers and many multi-core
> computers networked together) by passing messages between the different
> threads. OpenMP is a shared memory parallelization scheme that has
> different syntax and design philosophy to MPI.
> OpenMP is (from what I've heard) simpler to write and implement than MPI,
> yet it is limited to shared-memory machines and thus cannot scale as high as
> However, if you're just trying to compile code that someone else has already
> written, you need to know which one they used to parallelize their code and
> link with those libraries. If the developer of the package you're trying to
> use says to install libgomp, then just do that (or some other OpenMP
> implementation if it's available) and leave MPI alone ;).
> Hope this helps,
>> On Mon, Aug 8, 2011 at 09:21, Eric A. Borisch <eborisch at macports.org>
>> > On Mon, Aug 8, 2011 at 8:57 AM, Jason Swails <jason.swails at gmail.com>
>> > wrote:
>> >> I personally use mpich2 myself, but tend to compile my own MPIs, as the
>> >> multiplicity can get you in trouble (if you link serial libraries to
>> >> MPI
>> >> code, you can run into lots of problems if the compiler version used to
>> >> build the MPI libraries, and therefore the ones you're using to build
>> >> the
>> >> MPI code if you use mpicc/mpif90, is not the same as the compiler
>> >> version
>> >> you used to build the serial libraries).
>> >> HTH,
>> >> Jason
>> > FWIW, The mpich2 port supports a number of underlying compilers
>> > through the variants... Hopefully your favorite in the list.
>> > -Eric
>> > --
>> > Eric A. Borisch
> Jason M. Swails
> Quantum Theory Project,
> University of Florida
> Ph.D. Candidate
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