Designation: Non-Export Controlled Content
Gilles;
My scenario involves a Dispatcher of rank 0, and several
sensors and proxy objects. The Dispatcher triggers activity and gathers
results. The proxies get triggered first. They send data to the sensors, and
the sensors indicate to the dispatcher that they are done. I am trying to
create 2 comm groups. One for the sensors and one for the proxies. The
dispatcher will use the 2 comm groups to coordinate activity. I tried adding
the dispatcher to the sensorList comm group, but I get an error saying "invalid
task".
Rick
From: users [mailto:users-boun...@lists.open-mpi.org] On Behalf Of Gilles
Gouaillardet
Sent: Monday, October 17, 2016 9:30 AM
To: Open MPI Users
Subject: Re: [OMPI users] communications groups
Rick,
I re-read the MPI standard and was unable to figure out if sensorgroup is
MPI_GROUP_EMPTY or a group with task 1 on tasks except task 1
(A group that does not contain the current task makes little sense to me, but I
do not see any reason why this group have to be MPI_GROUP_EMPTY)
Regardless, sensorComm will be MPI_COMM_NULL except on task 1, so MPI_Barrier
will fail.
Cheers,
Gilles
On Monday, October 17, 2016, Marlborough, Rick
<rmarlboro...@aaccorp.com<mailto:rmarlboro...@aaccorp.com>> wrote:
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<javascript:_e(%7B%7D,'cvml','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<javascript:_e(%7B%7D,'cvml','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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