[mpich-discuss] mpiexec kills the remote login shell

[Yu-Cheng Chou]

>  Hi,
>   I will take a look at the debug logs and get back to you. Meanwhile, can
>   you run simple C programs without using mpiexec on Korbet ?

Yes. I can run a simple non-MPI C program without using mpiexec on Korebot.


>   MPICH2 currently does not support heterogeneous systems (So you won't be
>   able to run your MPI job across ARM & other architectures).

When the "mpiexec" is initiated from the lap top instead of Korebot,
the "ssh disconnection" issue does not exist.  However, the "huge pi"
issue is still there.


>> # Can you run non-MPI programs using mpiexec (mpiexec -n 2 hostname) ?
> Yes.
>
>> # Can you compile and run the hello world program (examples/hellow.c)
>> provided with MPICH2 (mpiexec -n 2 ./hellow)?
> Yes.
>
>> # How did you start smpd (the command used to start smpd) ? How did
>> you run your MPI job (the command used to run your job)?
> I have a ".smpd" file containing one line of information, which is
> "phrase=123".
> Thus, I started smpd using "smpd -s".
> Then I used "mpiexec -n 1 hellow" to run hellow on Korebot.
>
>> # How did you find that mpiexec kills the sshd process (We typically
>> ssh to unix machines and run mpiexec without any problems) ?
> I logged in Korebot with two terminals.
> From #1 terminal, I checked all the processes running on Korebot.
> From #2 terminal, I started smpd and run hellow using the commands mentioned
> above.
> After hellow was finished, the connection to Korebot via #2 terminal was
> closed.
> From #1 terminal, I knew that the sshd process associated with #2 terminal
> was gone.
>
>>  Can you run smpd/mpiexec in debug mode and provide us with the
>> outputs (smpd -d / mpiexec -n 2 -verbose hostname) ?
> The first attached text file is the output from running hellow in mpiexec's
> verbose mode.
>
>
> There is another issue.
> This time, I used two machines. One is Korebot as mentioned above, and the
> other is a laptop running Ubuntu Linux OS.
> I started smpd with the same ".smpd" file and command as mentioned above
> both on Korebot and the lap top.
> There is a machine file called "hostfile" on Korebot. The file contains the
> following information about the name of the two machines.
>
> korebot
> shrimp
>
> Then from Korebot, I ran cpi using the following command.
>
> mpiexec -machinefile ./hostfile -verbose -n 2 cpi
>
>
> But the value of pi is a huge number. I think it is related to "double type
> variables" being transferred between processes running on an ARM-based Linux
> and a general Linux machines.
>
> The second attached text file is the output from running cpi in mpiexec's
> verbose mode.
>
>
>>
>> I am cross-compiling mpich2-1.0.8 with smpd for Khepera III mobile robot.
>>
>> This mobile robot has a Korebot board which is an ARM-based computer
>> with a Linux operating system.
>>
>> The cross-compilation was fine.
>>
>> Firstly, I logged in to Korebot through ssh.
>> Secondly, I started smpd.
>> Thirdly, I ran mpiexec to execute an MPI program (cpi) that comes with
>> the package.
>>
>> The result was correct, but when mpiexec was finished, the ssh
>> connection to the Korebot was closed.
>> I found that mpiexec kills the sshd process through which I was
>> remotely connected to Korebot.
>>
>> I've been looking for the cause, but still have not found any clues.
>>
>> Could you give me any ideas to solve this problem?
>>
>> Thank you,
>>
>> Yu-Cheng
>>
>