When I add the info parameter in MPI_Comm_spawn, I get the error
"Some of the requested hosts are not included in the current allocation
for the application:
[...]
Verify that you have mapped the allocated resources properly using the
--host specification."
Here is a snippet of my code that causes the error:
MPI_Info info;
MPI_Info_create( &info );
MPI_Info_set(info,"host","localhost");
MPI_Comm_spawn( cmd , MPI_ARGV_NULL , nkids , info , 0 ,
MPI_COMM_SELF , &kid , errs );
Mark Borgerding wrote:
Thanks, I don't know how I missed that. Perhaps I got thrown off by
"Portable programs not requiring detailed control over process
locations should use MPI_INFO_NULL."
If there were a computing equivalent of Maslow's Hierarchy of Needs,
functioning would be more fundamental than portability :)
-- Mark
Ralph Castain wrote:
Take a look at the man page for MPI_Comm_spawn. It should explain
that you need to create an MPI_Info key that has the key of "host"
and a value that contains a comma-delimited list of hosts to be used
for the child processes.
Hope that helps
Ralph
On Jul 28, 2008, at 8:54 AM, Mark Borgerding wrote:
How does openmpi decide which hosts are used with MPI_Comm_spawn?
All the docs I've found talk about specifying hosts on the
mpiexec/mpirun command and so are not applicable.
I am unable to spawn on anything but localhost (which makes for a
pretty uninteresting cluster).
When I run
ompi_info --param rds hostfile
It reports MCA rds: parameter "rds_hostfile_path"
(current value:
"/usr/lib/openmpi/1.2.5-gcc/etc/openmpi-default-hostfile")
I tried changing that file but it has no effect.
I am using
openmpi 1.2.5
CentOS 5.2
ethernet TCP
-- Mark
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--
Mark Borgerding
3dB Labs, Inc
Innovate. Develop. Deliver.
