Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] Running application with MPI_Comm_spawn() in multithreaded environment
From: Roberto Fichera (kernel_at_[hidden])
Date: 2008-10-01 11:04:04


Ralph Castain ha scritto:
> Okay, I believe I understand the problem. What this error is telling
> you is that the Torque MOM is refusing our connection request because
> it is already busy. So we cannot spawn another process.
>
> If I understand your application correctly, you are spinning off
> multiple threads, each attempting to comm_spawn a single process -
> true? The problem with that design is that - since OMPI is not thread
> safe yet - these threads are all attempting to connect to the MOM at
> the same time. The MOM will only allow one connection at a time, and
> so at some point we are requesting a connection while already connected.
>
> Since we are some ways off from attaining thread safety in these
> scenarios, you really have three choices:
>
> 1. you could do this with a single comm_spawn call. Remember, you can
> provide an MPI_Info key to comm_spawn essentially telling it where to
> place the various process ranks. Unless you truly want each new
> process to be in its own comm_world, there is no real need to do this
> with 10000 individual calls to comm_spawn.
I need only a master to single slave communication, the slaves *doesn't*
need to communicate all together. The logic within the test program
is quite easy, it will dispatch as many jobs as the user need across the
assigned nodes, try to take it busy as much as possible. That's because
our algorithms need a tree evolution where a node is master of a bounch
of slaves, and a slave can be a sub-master of a bounch of slaves, this
depends by how the each leaf will evolve in its computation. Generally
we don't go to much than 5 o 6 levels in deep. But we need a very
dynamic logic for dispatching jobs.
> 2. you could execute your own thread locking scheme in your
> application so that only one thread calls comm_spawn at a time.
I done it with and without _tm_ support and using a mutex to serialize
the MPI_Comm_spawn().
The log below is using the torque/pbs support compiled in:

[roberto_at_master TestOpenMPI]$ mpirun --verbose --debug-daemons -wdir
"`pwd`" -np 1 testmaster 100000 $PBS_NODEFILE
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
add_local_procs
[master.tekno-soft.it:07844] [[10231,0],0] node[0].name master daemon 0
arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[1].name cluster4 daemon
INVALID arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[2].name cluster3 daemon
INVALID arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[3].name cluster2 daemon
INVALID arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[4].name cluster1 daemon
INVALID arch ffc91200
Initializing MPI ...
[master.tekno-soft.it:07844] [[10231,0],0] orted_recv: received
sync+nidmap from local proc [[10231,1],0]
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
message_local_procs
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
message_local_procs
Loading the node's ring from file
'/var/torque/aux//929.master.tekno-soft.it'
... adding node #1 host is 'cluster4.tekno-soft.it'
... adding node #2 host is 'cluster3.tekno-soft.it'
... adding node #3 host is 'cluster2.tekno-soft.it'
... adding node #4 host is 'cluster1.tekno-soft.it'
A 4 node's ring has been made
At least one node is available, let's start to distribute 100000 job
across 4 nodes!!!
****************** Starting job #1
****************** Starting job #2
****************** Starting job #3
****************** Starting job #4
Setting up the host as 'cluster4.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster4.tekno-soft.it'
Setting up the host as 'cluster3.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster3.tekno-soft.it'
Setting up the host as 'cluster2.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster2.tekno-soft.it'
Setting up the host as 'cluster1.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster1.tekno-soft.it'
Daemon was launched on cluster4.tekno-soft.it - beginning to initialize
Daemon [[10231,0],1] checking in as pid 4869 on host cluster4.tekno-soft.it
Daemon [[10231,0],1] not using static ports
[cluster4.tekno-soft.it:04869] [[10231,0],1] orted: up and running -
waiting for commands!
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
add_local_procs
[master.tekno-soft.it:07844] [[10231,0],0] node[0].name master daemon 0
arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[1].name cluster4 daemon
1 arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[2].name cluster3 daemon
INVALID arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[3].name cluster2 daemon
INVALID arch ffc91200
[master.tekno-soft.it:07844] [[10231,0],0] node[4].name cluster1 daemon
INVALID arch ffc91200
[cluster4.tekno-soft.it:04869] [[10231,0],1] orted_cmd: received
add_local_procs
[cluster4.tekno-soft.it:04869] [[10231,0],1] node[0].name master daemon
0 arch ffc91200
[cluster4.tekno-soft.it:04869] [[10231,0],1] node[1].name cluster4
daemon 1 arch ffc91200
[cluster4.tekno-soft.it:04869] [[10231,0],1] node[2].name cluster3
daemon INVALID arch ffc91200
[cluster4.tekno-soft.it:04869] [[10231,0],1] node[3].name cluster2
daemon INVALID arch ffc91200
[cluster4.tekno-soft.it:04869] [[10231,0],1] node[4].name cluster1
daemon INVALID arch ffc91200
[cluster4.tekno-soft.it:04869] [[10231,0],1] orted_recv: received
sync+nidmap from local proc [[10231,2],0]
[cluster4.tekno-soft.it:04869] [[10231,0],1] orted_cmd: received
collective data cmd
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
message_local_procs
[cluster4.tekno-soft.it:04869] [[10231,0],1] orted_cmd: received
message_local_procs
[cluster4.tekno-soft.it:04869] [[10231,0],1] orted_cmd: received
collective data cmd
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:07844] [[10231,0],0] orted_cmd: received
message_local_procs
[cluster4.tekno-soft.it:04869] [[10231,0],1] orted_cmd: received
message_local_procs
Killed
[cluster4.tekno-soft.it:04869] [[10231,0],1] routed:binomial: Connection
to lifeline [[10231,0],0] lost
[cluster4.tekno-soft.it:04869] [[10231,0],1] routed:binomial: Connection
to lifeline [[10231,0],0] lost
[roberto_at_master TestOpenMPI]$

this one is *without-tm*

[roberto_at_master TestOpenMPI]$ mpirun --verbose --debug-daemons -wdir
"`pwd`" -np 1 testmaster 100000 $PBS_NODEFILE
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
add_local_procs
[master.tekno-soft.it:25143] [[23396,0],0] node[0].name master daemon 0
arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[1].name cluster4 daemon
INVALID arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[2].name cluster3 daemon
INVALID arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[3].name cluster2 daemon
INVALID arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[4].name cluster1 daemon
INVALID arch ffc91200
Initializing MPI ...
[master.tekno-soft.it:25143] [[23396,0],0] orted_recv: received
sync+nidmap from local proc [[23396,1],0]
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
message_local_procs
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
message_local_procs
Loading the node's ring from file
'/var/torque/aux//928.master.tekno-soft.it'
... adding node #1 host is 'cluster4.tekno-soft.it'
... adding node #2 host is 'cluster3.tekno-soft.it'
... adding node #3 host is 'cluster2.tekno-soft.it'
... adding node #4 host is 'cluster1.tekno-soft.it'
A 4 node's ring has been made
At least one node is available, let's start to distribute 100000 job
across 4 nodes!!!
****************** Starting job #1
****************** Starting job #2
****************** Starting job #3
****************** Starting job #4
Setting up the host as 'cluster4.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster4.tekno-soft.it'
Setting up the host as 'cluster3.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster3.tekno-soft.it'
Setting up the host as 'cluster2.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster2.tekno-soft.it'
Setting up the host as 'cluster1.tekno-soft.it'
Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
Spawning a task 'testslave.sh' on node 'cluster1.tekno-soft.it'
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
add_local_procs
[master.tekno-soft.it:25143] [[23396,0],0] node[0].name master daemon 0
arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[1].name cluster4 daemon
1 arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[2].name cluster3 daemon
INVALID arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[3].name cluster2 daemon
INVALID arch ffc91200
[master.tekno-soft.it:25143] [[23396,0],0] node[4].name cluster1 daemon
INVALID arch ffc91200
Daemon was launched on cluster4.tekno-soft.it - beginning to initialize
Daemon [[23396,0],1] checking in as pid 3653 on host cluster4.tekno-soft.it
Daemon [[23396,0],1] not using static ports
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted: up and running -
waiting for commands!
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted_cmd: received
add_local_procs
[cluster4.tekno-soft.it:03653] [[23396,0],1] node[0].name master daemon
0 arch ffc91200
[cluster4.tekno-soft.it:03653] [[23396,0],1] node[1].name cluster4
daemon 1 arch ffc91200
[cluster4.tekno-soft.it:03653] [[23396,0],1] node[2].name cluster3
daemon INVALID arch ffc91200
[cluster4.tekno-soft.it:03653] [[23396,0],1] node[3].name cluster2
daemon INVALID arch ffc91200
[cluster4.tekno-soft.it:03653] [[23396,0],1] node[4].name cluster1
daemon INVALID arch ffc91200
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted_recv: received
sync+nidmap from local proc [[23396,2],0]
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted_cmd: received
collective data cmd
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
message_local_procs
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted_cmd: received
message_local_procs
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted_cmd: received
collective data cmd
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
collective data cmd
[master.tekno-soft.it:25143] [[23396,0],0] orted_cmd: received
message_local_procs
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted_cmd: received
message_local_procs

[... got a freeze here ... than ^C ...]

mpirun: killing job...

--------------------------------------------------------------------------
mpirun noticed that process rank 0 with PID 25150 on node
master.tekno-soft.it exited on signal 0 (Unknown signal 0).
--------------------------------------------------------------------------
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted_cmd: received exit
[cluster4.tekno-soft.it:03653] [[23396,0],1] orted: finalizing
mpirun: clean termination accomplished

[cluster4:03653] *** Process received signal ***
[cluster4:03653] Signal: Segmentation fault (11)
[cluster4:03653] Signal code: Address not mapped (1)
[cluster4:03653] Failing at address: 0x2aaaab784af0

So it seem that we have some problem in other places, maybe some other
functions are not
thread safe.

> 3. remove the threaded launch scenario and just call comm_spawn in a
> loop.
>
> In truth, the threaded approach to spawning all these procs isn't
> gaining you anything. Torque will only do one launch at a time anyway,
> so you will launch them serially no matter what. You may just be
> adding complexity for no real net gain.
Talking about torque/pbs/maui, that's ok! It doen't handle multiple
spawn at the same time.
But in general, if I don't used _tm_ any more, I guess that we can get a
gain on executing parallel spawn,
because the spawn will be done using ssh/rsh.
>
> Ralph
>
> On Oct 1, 2008, at 1:56 AM, Roberto Fichera wrote:
>
>> Ralph Castain ha scritto:
>>> Hi Roberto
>>>
>>> There is something wrong with this cmd line - perhaps it wasn't copied
>>> correctly?
>>>
>>> mpirun --verbose --debug-daemons --mca obl -np 1 -wdir `pwd`
>>> testmaster 10000 $PBS_NODEFILE
>>>
>>> Specifically, the following is incomplete: --mca obl
>>>
>>> I'm not sure if this is the problem or not, but I am unaware of such
>>> an option and believe it could cause mpirun to become confused.
>> Ops! Sorry, I copied the wrong log, below there the right one:
>>
>> [roberto_at_master TestOpenMPI]$ qsub -I testmaster.pbs
>> qsub: waiting for job 920.master.tekno-soft.it to start
>> qsub: job 920.master.tekno-soft.it ready
>>
>> [roberto_at_master TestMPICH2]$ cd /data/roberto/MPI/TestOpenMPI/
>> [roberto_at_master TestOpenMPI]$ mpirun --debug-daemons --mca btl tcp,self
>> -wdir "`pwd`" -np 1 testmaster 100000 $PBS_NODEFILE
>> [master.tekno-soft.it:05407] [[11340,0],0] orted_cmd: received
>> add_local_procs
>> [master.tekno-soft.it:05407] [[11340,0],0] node[0].name master daemon 0
>> arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[1].name cluster4 daemon
>> INVALID arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[2].name cluster3 daemon
>> INVALID arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[3].name cluster2 daemon
>> INVALID arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[4].name cluster1 daemon
>> INVALID arch ffc91200
>> Initializing MPI ...
>> [master.tekno-soft.it:05407] [[11340,0],0] orted_recv: received
>> sync+nidmap from local proc [[11340,1],0]
>> [master.tekno-soft.it:05407] [[11340,0],0] orted_cmd: received
>> collective data cmd
>> [master.tekno-soft.it:05407] [[11340,0],0] orted_cmd: received
>> message_local_procs
>> [master.tekno-soft.it:05407] [[11340,0],0] orted_cmd: received
>> collective data cmd
>> [master.tekno-soft.it:05407] [[11340,0],0] orted_cmd: received
>> message_local_procs
>> Loading the node's ring from file
>> '/var/torque/aux//920.master.tekno-soft.it'
>> ... adding node #1 host is 'cluster4.tekno-soft.it'
>> ... adding node #2 host is 'cluster3.tekno-soft.it'
>> ... adding node #3 host is 'cluster2.tekno-soft.it'
>> ... adding node #4 host is 'cluster1.tekno-soft.it'
>> A 4 node's ring has been made
>> At least one node is available, let's start to distribute 100000 job
>> across 4 nodes!!!
>> ****************** Starting job #1
>> ****************** Starting job #2
>> ****************** Starting job #3
>> Setting up the host as 'cluster4.tekno-soft.it'
>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>> Spawning a task 'testslave' on node 'cluster4.tekno-soft.it'
>> Setting up the host as 'cluster3.tekno-soft.it'
>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>> Spawning a task 'testslave' on node 'cluster3.tekno-soft.it'
>> Setting up the host as 'cluster2.tekno-soft.it'
>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>> Spawning a task 'testslave' on node 'cluster2.tekno-soft.it'
>> Setting up the host as 'cluster1.tekno-soft.it'
>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>> Spawning a task 'testslave' on node 'cluster1.tekno-soft.it'
>> ****************** Starting job #4
>> Daemon was launched on cluster3.tekno-soft.it - beginning to initialize
>> Daemon [[11340,0],1] checking in as pid 9487 on host
>> cluster3.tekno-soft.it
>> Daemon [[11340,0],1] not using static ports
>> --------------------------------------------------------------------------
>>
>> A daemon (pid unknown) died unexpectedly on signal 1 while
>> attempting to
>> launch so we are aborting.
>>
>> There may be more information reported by the environment (see above).
>>
>> This may be because the daemon was unable to find all the needed shared
>> libraries on the remote node. You may set your LD_LIBRARY_PATH to
>> have the
>> location of the shared libraries on the remote nodes and this will
>> automatically be forwarded to the remote nodes.
>> --------------------------------------------------------------------------
>>
>> [master.tekno-soft.it:05407] [[11340,0],0] ORTE_ERROR_LOG: Resource busy
>> in file base/plm_base_receive.c at line 169
>> [master.tekno-soft.it:05414] [[11340,1],0] ORTE_ERROR_LOG: The specified
>> application failed to start in file dpm_orte.c at line 677
>> [master.tekno-soft.it:05414] *** An error occurred in MPI_Comm_spawn
>> [master.tekno-soft.it:05414] *** on communicator MPI_COMM_WORLD
>> [master.tekno-soft.it:05414] *** MPI_ERR_SPAWN: could not spawn
>> processes
>> [master.tekno-soft.it:05414] *** MPI_ERRORS_ARE_FATAL (goodbye)
>>
>> [master.tekno-soft.it:05407] [[11340,0],0] ORTE_ERROR_LOG: Resource busy
>> in file base/plm_base_receive.c at line 169
>> [master.tekno-soft.it:05407] [[11340,0],0] orted_cmd: received
>> add_local_procs
>> [master.tekno-soft.it:05407] [[11340,0],0] node[0].name master daemon 0
>> arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[1].name cluster4 daemon
>> INVALID arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[2].name cluster3 daemon
>> 1 arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[3].name cluster2 daemon
>> INVALID arch ffc91200
>> [master.tekno-soft.it:05407] [[11340,0],0] node[4].name cluster1 daemon
>> INVALID arch ffc91200
>> [cluster3.tekno-soft.it:09487] [[11340,0],1] orted: up and running -
>> waiting for commands!
>>
>>
>>
>>>
>>> Ralph
>>>
>>>
>>> On Sep 30, 2008, at 8:24 AM, Roberto Fichera wrote:
>>>
>>>> Roberto Fichera ha scritto:
>>>>> Hi All on the list,
>>>>>
>>>>> I'm trying to execute dynamic MPI applications using
>>>>> MPI_Comm_spawn().
>>>>> The application I'm using for tests, basically is
>>>>> composed by a master, which spawn a slave in each assigned node in a
>>>>> multithreading fashion. The master is started with a
>>>>> number of jobs to perform and a filename, containing the list of
>>>>> assigned nodes. The idea is to handle all the dispatching
>>>>> logic within the application, so that the master will try to take as
>>>>> busy as possible each assigned node. Said that, for each spawned
>>>>> job, the master allocate a thread for spawning and handling the
>>>>> communication, than generate a random number, send it to the
>>>>> slave which simply send it back to the master. Finally the slave
>>>>> terminate its job and the relative node become free for a new one.
>>>>> The things will continue until all the requested jobs are done.
>>>>>
>>>>> The test program I'm using *doesn't* work flawless in mpich2
>>>>> because it
>>>>> has a ~24k spawned job limitation, due to a monotonically
>>>>> increasing of its internal context id which basically stops the
>>>>> application due to a library internal overflow. The internal context
>>>>> id,
>>>>> allocated
>>>>> for each terminated spawned job, are never recycled at moment. The
>>>>> unique MPI-2 implementation, so supporting MPI_Comm_spawn(),
>>>>> which was able to complete the test is currently the HP MPI. So now I
>>>>> would start to check OpenMPI if it's suitable for our dynamic
>>>>> parallel
>>>>> applications.
>>>>>
>>>>> The test application is linked against OpenMPI v1.3a1r19645,
>>>>> running of
>>>>> Fedora8 x86_64 + all updates.
>>>>>
>>>>> My first attempt end up on the error below which I basically don't
>>>>> know
>>>>> where to look further. Note that I've already checked PATHs and
>>>>> LD_LIBRARY_PATH, the application is basically configured correctly
>>>>> since
>>>>> it uses two scripts for starting and all the paths are set there.
>>>>> Basically I need to start *one* master application which will handle
>>>>> all
>>>>> the things for managing slave applications. The communication is
>>>>> *only*
>>>>> master <-> slave and never collective, at moment.
>>>>>
>>>>> The test program is available on request.
>>>>>
>>>>> Does any one have an idea what's going on?
>>>>>
>>>>> Thanks in advance,
>>>>> Roberto Fichera.
>>>>>
>>>>> [roberto_at_cluster4 TestOpenMPI]$ orterun -wdir
>>>>> /data/roberto/MPI/TestOpenMPI -np
>>>>> 1 testmaster 10000 $PBS_NODEFILE
>>>>> Initializing MPI ...
>>>>> Loading the node's ring from file
>>>>> '/var/torque/aux//909.master.tekno-soft.it'
>>>>> ... adding node #1 host is 'cluster3.tekno-soft.it'
>>>>> ... adding node #2 host is 'cluster2.tekno-soft.it'
>>>>> ... adding node #3 host is 'cluster1.tekno-soft.it'
>>>>> ... adding node #4 host is 'master.tekno-soft.it'
>>>>> A 4 node's ring has been made
>>>>> At least one node is available, let's start to distribute 10000 job
>>>>> across 4
>>>>> nodes!!!
>>>>> ****************** Starting job #1
>>>>> ****************** Starting job #2
>>>>> ****************** Starting job #3
>>>>> ****************** Starting job #4
>>>>> Setting up the host as 'cluster3.tekno-soft.it'
>>>>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>>>>> Spawning a task './testslave.sh' on node 'cluster3.tekno-soft.it'
>>>>> Setting up the host as 'cluster2.tekno-soft.it'
>>>>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>>>>> Spawning a task './testslave.sh' on node 'cluster2.tekno-soft.it'
>>>>> Setting up the host as 'cluster1.tekno-soft.it'
>>>>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>>>>> Spawning a task './testslave.sh' on node 'cluster1.tekno-soft.it'
>>>>> Setting up the host as 'master.tekno-soft.it'
>>>>> Setting the work directory as '/data/roberto/MPI/TestOpenMPI'
>>>>> Spawning a task './testslave.sh' on node 'master.tekno-soft.it'
>>>>> --------------------------------------------------------------------------
>>>>>
>>>>>
>>>>> A daemon (pid unknown) died unexpectedly on signal 1 while
>>>>> attempting to
>>>>> launch so we are aborting.
>>>>>
>>>>> There may be more information reported by the environment (see
>>>>> above).
>>>>>
>>>>> This may be because the daemon was unable to find all the needed
>>>>> shared
>>>>> libraries on the remote node. You may set your LD_LIBRARY_PATH to
>>>>> have the
>>>>> location of the shared libraries on the remote nodes and this will
>>>>> automatically be forwarded to the remote nodes.
>>>>> --------------------------------------------------------------------------
>>>>>
>>>>>
>>>>> [cluster4.tekno-soft.it:21287] [[30014,0],0] ORTE_ERROR_LOG:
>>>>> Resource busy in
>>>>> file base/plm_base_receive.c at line 169
>>>>> [cluster4.tekno-soft.it:21287] [[30014,0],0] ORTE_ERROR_LOG:
>>>>> Resource busy in
>>>>> file base/plm_base_receive.c at line 169
>>>>>
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>