Designation: Non-Export Controlled Content
George;
Thanks for your response. Your second sentence is a little
confusing. If my world group is P0,P1, visible on both processes, why wouldn't
the sensorList contain P1 on both processes?
Rick
From: users [mailto:users-boun...@lists.open-mpi.org] On Behalf Of George
Bosilca
Sent: Friday, October 14, 2016 5:44 PM
To: Open MPI Users
Subject: Re: [OMPI users] communications groups
Rick,
Let's assume that you have started 2 processes, and that your sensorList is
{1}. The worldgroup will then be {P0, P1}, which trimmed via the sensorList
will give the sensorgroup {MPI_GROUP_EMPTY} on P0 and the sensorgroup {P1} on
P1. As a result on P0 you will create a MPI_COMM_NULL communicator, while on P1
you will have a valid communicator sensorComm (which will only contain P1). You
cannot do a Barrier on an MPI_COMM_NULL communicator, which might explain the
"invalid communicator" error you are getting.
George.
On Fri, Oct 14, 2016 at 5:33 PM, Marlborough, Rick
<rmarlboro...@aaccorp.com<mailto:rmarlboro...@aaccorp.com>> wrote:
Designation: Non-Export Controlled Content
Folks;
I have the following code setup. The sensorList is an array of
ints of size 1. The value it contains is 1. My comm world size is 5. The call
to MPI_Barrier fails every time with error "invalid communicator". This code is
pretty much copied out of a text book. I must be doing something wrong. I just
don't see it. Can anyone else spot my error? I am using v2.01 on red hat 6.5.
Thanks
Rick
MPI_Comm_group(MPI_COMM_WORLD, &worldgroup);
MPI_Group_incl(worldgroup, 1, sensorList, &sensorgroup);
MPI_Comm_create(MPI_COMM_WORLD, sensorgroup, &sensorComm);
MPI_Barrier(sensorComm);
3.1.1001
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