[Beowulf] emulating MPI?
john.hearns at clustervision.com
Mon Jun 28 13:06:28 PDT 2004
On Mon, 2004-06-28 at 19:22, Robert G. Brown wrote:
> On Mon, 28 Jun 2004, John Wohlbier wrote:
> > Hi,
> > I'm wondering if there is a way to emulate MPI,
> > so that MPI software development may be done on a single
> > processor box and run with "virtual nodes."
> Doesn't MPI let you vary the number of tasks independent of the actual
> host list? Or do you mean something else?
Indeed it does. Just use a machines file something like:
I agree - that should get you up and running for tests on a single box.
The documentation for mpich says that 'n' is the number of processors.
But you can increase that number.
I stupidly just tried to start 100 processes on a dual CPU box
and promptly ran out of semaphores. Ahem.
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