[Trilinos-Users] Question concerning the Epetra BlockMap function : RemoteIDList

[Heroux, Mike]

John,

A few thoughts:

- Generally speaking, this is a collective call, so all MPI processes need
to participate in the call.  Some logic paths through the function don¹t
require communication if the situation is simple enough to compute with
local data.
- Check error codes to see if there is a non-zero value being returned.

Mike

On 9/17/15, 11:09 AM, "Trilinos-Users on behalf of John Jomo"
<trilinos-users-bounces at trilinos.org on behalf of john.jomo at tum.de> wrote:

>Hallo everyone,
>
>here is a question concerning Epetra:
>
>I have created a distributed Epetra_BlockMap and I'm trying to find out
>on which processes a set of Ids reside using the RemoteIDList command.
>
>I run a loop over the function  making repeated queries using different
>values of "IdsToQuery"
>int error = myMap->RemoteIDList( numberOfIds, &( IdsToQuery[0] ), &(
>processorIds[0] ), &( localIds[0] ));
>
>For some strange reason some processes find all Ids while others stall
>within the function causing a deadlock  :(
>
>I thought the problem was caused by mutlithreading so I pinned the
>mpi-processes to the cores and made sure that I only used one process
>per core. This however did not solve the problem.
>
>Would really appreciate some help on this.
>
>thanks in advance
>
>
>John.
>
>
>
>-- 
>John Jomo M.Sc.
>Technische Universität München
>Computation in Engineering
>Simulation in Applied Mechanics - SAM
>Arcisstraße 21
>80333 München
>Tel.:     0049 / 89 / 289 25064
>Fax:      0049 / 89 / 289 25051
>E-Mail:john.jomo at tum.de<mailto:john.jomo at tum.de>
>Internet:www.cie.bgu.tum.de<http://www.cie.bgu.tum.de/>
>
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