I'm afraid I can't dictate to the customer that they must upgrade.
The target platform is RHEL 5.2 ( uses openmpi 1.2.6 )
I will try to find some sort of workaround. Any suggestions on how to
"fake" the functionality of MPI_Comm_spawn are welcome.
To reiterate my needs:
I am writing a shared object that plugs into an existing framework.
I do not control how the framework launches its processes (no mpirun).
I want to start remote processes to crunch the data.
The shared object marshall the I/O between the framework and the remote
processes.
-- Mark
Ralph Castain wrote:
Singleton comm_spawn works fine on the 1.3 release branch - if
singleton comm_spawn is critical to your plans, I suggest moving to
that version. You can get a pre-release version off of the
www.open-mpi.org web site.
On Jul 30, 2008, at 6:58 AM, Ralph Castain wrote:
As your own tests have shown, it works fine if you just "mpirun -n 1
./spawner". It is only singleton comm_spawn that appears to be having
a problem in the latest 1.2 release. So I don't think comm_spawn is
"useless". ;-)
I'm checking this morning to ensure that singletons properly spawns
on other nodes in the 1.3 release. I sincerely doubt we will backport
a fix to 1.2.
On Jul 30, 2008, at 6:49 AM, Mark Borgerding wrote:
I keep checking my email in hopes that someone will come up with
something that Matt or I might've missed.
I'm just having a hard time accepting that something so fundamental
would be so broken.
The MPI_Comm_spawn command is essentially useless without the
ability to spawn processes on other nodes.
If this is true, then my personal scorecard reads:
# Days spent using openmpi: 4 (off and on)
# identified bugs in openmpi :2
# useful programs built: 0
Please prove me wrong. I'm eager to be shown my ignorance -- to
find out where I've been stupid and what documentation I should've
read.
Matt Hughes wrote:
I've found that I always have to use mpirun to start my spawner
process, due to the exact problem you are having: the need to give
OMPI a hosts file! It seems the singleton functionality is lacking
somehow... it won't allow you to spawn on arbitrary hosts. I have not
tested if this is fixed in the 1.3 series.
Try
mpiexec -np 1 -H op2-1,op2-2 spawner op2-2
mpiexec should start the first process on op2-1, and the spawn call
should start the second on op2-2. If you don't use the Info object to
set the hostname specifically, then on 1.2.x it will automatically
start on op2-2. With 1.3, the spawn call will start processes
starting with the first item in the host list.
mch
[snip]
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