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From: Lisandro Dalcin (dalcinl_at_[hidden])
Date: 2006-10-12 20:33:08

I am getting errors using persistent communications (OMPI 1.1.1). I am
trying to implement (in Python) example 2.32 from page 107 of MPI- The
Complete Reference (V1, 2nd. edition).

I think the problem is not in my wrappers (my script works fine with
MPICH2). Below the two issues:

1 - MPI_Startall fails (returning a negative error code, -105, which
in fact it seems to be out of range [MPI_SUCCESS...MPI_LASTCODE]).
However, doing 'for r in reqlist: r.Start()' works.

2 - And then, calling MPI_Waitall (or even iterating over request
array and calling MPI_Wait), the request seems to be deallocated (I
get MPI_REQUEST_NULL upon return), so I cannot start them again. I
understand this is wrong, the request handles should be marked as
inactive, but not for deallocation.

Please, ignore me if this was reported. I am really busy and I have
not found the time to navigate the OMPI sources to get in touch with
its internal, so I am always reporting problems, and never patches.

Lisandro Dalcín
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
PTLC - Güemes 3450, (3000) Santa Fe, Argentina
Tel/Fax: +54-(0)342-451.1594