On Dec 11, 2006, at 11:48 PM, Bora Ucar wrote:
> ----------------------------------------------------------------------
> -------
> It seems that at least one rank invoked MPI_INIT after invoking
> MPI_FINALIZE. MPI can not be re-initialized after MPI_FINALIZE has
> been called. The process was PID 28477 on host motek.
>
> It was probably rank (unknown) on MPI_COMM_WORLD, but I can't say
> that for
> sure...
> ----------------------------------------------------------------------
> -------
>
> If I use 'clear functions' in matlab prompt between the subsequent
> calls, then everything seems to be fine.
>
> I am using LAM/MPI: 7.1.2 and Matlab Version 7.1.0.183 (R14)
> Service Pack 3.
>
> I do not want to clear functions. 'clear manager' sometimes works but
> sometimes returns with a segmentation violation error.
>
> What can I do? Any suggestions?
I'm afraid I can't offer much more advice than "don't do that". The
MPI standard specifically states that calling MPI_INIT then
MPI_FINALIZE then MPI_INIT again is erroneous and should result in an
error. Based on the fact that 'clear functions' allows this
behavior, it must completely unload the LAM code from the process,
but I can't tell you why 'clear manager' doesn't do the same thing.
There are really only two solutions:
1) Edit manager so that it stays loaded for the life of it's use
in that
matlab instance, only calling MPI_Finalize when you will never
need
it again (MPI_Initialized() can be useful to determine if you
need to
call MPI_INIT).
2) Find out from Matlab experts exactly how to make sure that all
of LAM's
libraries are completely unloaded from the process image space
between
uses.
Hope this helps,
Brian
--
Brian Barrett
LAM/MPI developer and all around nice guy
Have a LAM/MPI day: http://www.lam-mpi.org/
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