Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

From: Durga Choudhury (dpchoudh_at_[hidden])
Date: 2006-09-05 19:52:15

My opinion would be to use pthreads, for a couple of reasons:

1. You don't need an OMP aware compiler; any old compiler would do.
2. The pthread library is more well adapted and hence might be more
optimized than the code emitted from an OMP compiler.

If your operating system is Linux, you may use the clone() system call
directly; this would add further optimization at the expense of portability.


On 9/5/06, George Bosilca <bosilca_at_[hidden]> wrote:
> On Sep 5, 2006, at 3:19 AM, Aidaros Dev wrote:
> > Nowdays we hear about intel dual core processor, An Intel dual-core
> > processor consists of two complete execution cores in one physical
> > processor both running at the same frequency. Both cores share the
> > same packaging and the same interface with the chipset/memory.
> > Can I use MPI library to communicate these processors? Can we
> > consider as they are separated?
> Yes and yes. However, these architectures fit better on a different
> programming model. If you want to get the max performance out of
> them, a OMP approach (instead of MPI) is more suitable. Using
> processes on such architecture is just a waste of performance. One
> should use a thread model, with locking to insure the coordination
> between memory accesses. Or let the underlying libraries do their
> magic for you. As an example most of the mathematical codes based on
> BLAS can use the GOTO BLAS (developed at TACC) to get multi-code (and
> multi-CPU) support for free, as this library will do all BLAS
> operation in parallel using multiple threads.
> george.
> _______________________________________________
> users mailing list
> users_at_[hidden]

Devil wanted omnipresence;
He therefore created communists.