On Jul 23, 2009, at 10:41 AM, Durga Choudhury wrote:
The 'system' command will fork a separate process to run. If I
remember correctly, forking within MPI can lead to undefined behavior.
Can someone in OpenMPI development team clarify?
It depends on your network, but in general, we don't reco
> You don't specify and based on your description I infer that you are not
> using a batch/queueing system, but just a rsh/ssh based start-up mechanism.
You are absolutely correct. I am using rsh/ssh based start-up mechanism.
A batch/queueing system might be able to tell you whether a remote co
The 'system' command will fork a separate process to run. If I
remember correctly, forking within MPI can lead to undefined behavior.
Can someone in OpenMPI development team clarify?
What I don't understand is: why is your TCP network so unstable that
you are worried about reachability? For MPI to
Thank you all Jeff, Jody, Prentice and Bogdan for your invaluable
clarification, solution and suggestion,
Open MPI should return a failure if TCP connectivity is lost, even with a
> non-blocking point-to-point operation. The failure should be returned in
> the call to MPI_TEST (and friends).
ev
On Thu, 23 Jul 2009, vipin kumar wrote:
1: Slave machine is reachable or not, (How I will do that ??? Given - I
have IP address and Host Name of Slave machine.)
2: if reachable, check whether program(orted and "slaveprocess") is alive
or not.
You don't specify and based on your description
Jeff Squyres wrote:
> On Jul 22, 2009, at 10:05 AM, vipin kumar wrote:
>
>> Actually requirement is how a C/C++ program running in "master" node
>> should find out whether "slave" node is reachable (as we check this
>> using "ping" command) or not ? Because IP address may change at any
>> time, t
Maybe you could make a system call to ping the other machine.
char sCommand[512];
// build the command string
sprintf(sCommand, "ping -c %d -q %s > /dev/null", numPings, sHostName);
// execute the command
int iResult =system(sCommand);
If the ping was successful, iResult will h
On Jul 23, 2009, at 7:36 AM, vipin kumar wrote:
I can't use blocking communication routines in my main program
( "masterprocess") because any type of network failure( may be due
to physical connectivity or TCP connectivity or MPI connection as
you told) may occur. So I am using non blocking
On Thu, Jul 23, 2009 at 3:03 PM, Ralph Castain wrote:
> It depends on which network fails. If you lose all TCP connectivity, Open
> MPI should abort the job as the out-of-band system will detect the loss of
> connection. If you only lose the MPI connection (whether TCP or some other
> interconnec
It depends on which network fails. If you lose all TCP connectivity,
Open MPI should abort the job as the out-of-band system will detect
the loss of connection. If you only lose the MPI connection (whether
TCP or some other interconnect), then I believe the system will
eventually generate a
>
> Are you asking to find out this information before issuing "mpirun"? Open
> MPI does assume that the nodes you are trying to use are reachable.
>
>
NO,
Scenario is a pair of processes are running one in "master" node say
"masterprocess" and one in "slave" node say "slaveprocess". When
"maste
On Jul 22, 2009, at 10:05 AM, vipin kumar wrote:
Actually requirement is how a C/C++ program running in "master" node
should find out whether "slave" node is reachable (as we check this
using "ping" command) or not ? Because IP address may change at any
time, that's why I am trying to achie
Hi Jeff,
Thanks for your response.
Actually requirement is how a C/C++ program running in "master" node should
find out whether "slave" node is reachable (as we check this using "ping"
command) or not ? Because IP address may change at any time, that's why I am
trying to achieve this using "host
I'm not sure what you mean. Open MPI uses the hostname of the machine
for general identification purposes. That may be the same (or not)
from the resolved name that comes back for a given IP interface.
What are you trying to check, exactly?
On Jul 16, 2009, at 1:56 AM, vipin kumar wrote:
Hi all,
Is there any way to check network connection using HostName in OpenMPI ?
Thanks and Regards,
--
Vipin K.
Research Engineer,
C-DOTB, India
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