Thanks a lot, that looks right! Looks like some reading to do..
Do you know if in the OpenMPI implementation the MPI_T-interfaced MCA
settings are thread-local, or rank-local?
Thanks!
Marcin
On 09/15/2015 07:58 PM, Nathan Hjelm wrote:
You can use MPI_T to set any MCA variable before MPI_Init. At this time
we lock down all MCA variable during MPI_Init. You will need to call
MPI_T_init_thread before MPI_Init and make sure to call MPI_T_finalize
any time after you are finished setting MCA variables. For more
information see MPI-3.1 chapter 14.
-Nathan
On Tue, Sep 15, 2015 at 07:40:56PM +0200, marcin.krotkiewski wrote:
I was wondering if it is possible, or considered to make it possible to
change the various MCA parameters by individual ranks during runtime in
addition to the command line?
I tried to google a bit, but did not get any indication that such topic has
even been discussed. It would be a very useful thing, especially in
multi-threaded applications when using MPI_THREAD_MULTIPLE, but I could come
up with plenty uses in usual single-threaded ranks setups.
Marcin
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