Hi there,
I am looking for a general solution that would allow for attaching extra
informacion to every MPI message sent and access this data after receive. I
mean a kind of out-out-bound (or urgent) data as in TCP/IP protocol. The
goal is to track sender callpoint address in a receiver process in order to
correlate sends and receives down to file/line in source code.
The requirement is not to modify a MPI-based application source code, but
rather modify MPI implementation (or create a kind-of wrapper for MPI calls)
that could do that. It's enough to pass just one integer value (tag field
cannot be used for that purpose). I'm using dynamic instrumentation
(DynInst) and have the ability to introduce run-time modifications. The
ideal solution would be the ability add some extra integer to message
envelope (in a reserved field for example) but without recompiling the MPI
implementation - so that 2 implementations (instrumented one and normal
one) could cooperate without problems.
Any ideas how to do that?
Regards,
--Oleg
Aplicaciones en Informatica Avanzada S.A.
c./Artesans 10, 08291 Cerdanyola del Valles,
Barcelona, Spain
|
